diff --git a/.changeset/olive-moons-travel.md b/.changeset/olive-moons-travel.md
new file mode 100644
index 0000000..3a1be31
--- /dev/null
+++ b/.changeset/olive-moons-travel.md
@@ -0,0 +1,27 @@
+---
+'seamless-auth-api': minor
+---
+
+Upgrade to Express 5.
+
+The HTTP contract is unchanged: every behaviour Express 5 alters by default is
+pinned or restored, so no caller has to adapt. Four things needed real work.
+
+- **Query validation stopped applying.** Express 5 exposes `req.query` as a
+  getter with no setter that re-reads the URL on every access, so the assignment
+  in `defineRoute` threw and every route with a query schema answered 404. The
+  validated query is now installed as an own property, which is what makes the
+  schema's coercions survive into the handler.
+- **The query parser default changed** from `extended` to `simple`, which would
+  have read `a[b]=1` as the literal key `a[b]`. Pinned back to `extended` so an
+  upgrade here never silently changes how a caller's query string parses. A move
+  to the narrower parser stays available as a deliberate change.
+- **A request with no body now arrives as `undefined`** rather than `{}`. Bodies
+  are validated as `{}` when absent, so a body-less request still reports its
+  missing fields instead of one opaque "expected object, received undefined", and
+  `DELETE /admin/users` answers `User not found.` as before rather than throwing.
+- **The SPA history fallback route no longer parsed.** path-to-regexp v8 rejects
+  a bare `*`, so `/console/*` is now the named `/console/*splat`.
+
+Route params are typed through a new `RouteRequest`, since Express 5 widens
+`req.params` to `string | string[]` for the repeatable params this API does not use.
diff --git a/package-lock.json b/package-lock.json
index 73cb8a2..061416d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -18,7 +18,7 @@
         "base64url": "^3.0.1",
         "bcrypt-ts": "^7.1.0",
         "cors": "^2.8.5",
-        "express": "^4.19.2",
+        "express": "^5.2.1",
         "express-rate-limit": "^7.5.0",
         "express-slow-down": "^3.1.1",
         "helmet": "^8.3.0",
@@ -40,7 +40,7 @@
         "@commitlint/config-conventional": "^20.5.0",
         "@eslint/js": "^10.0.1",
         "@types/cors": "^2.8.17",
-        "@types/express": "^4.17.24",
+        "@types/express": "^5.0.6",
         "@types/jsonwebtoken": "^9.0.6",
         "@types/node": "^24.10.1",
         "@types/supertest": "^6.0.3",
@@ -2329,23 +2329,6 @@
         }
       }
     },
-    "node_modules/@inquirer/external-editor/node_modules/iconv-lite": {
-      "version": "0.7.2",
-      "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.7.2.tgz",
-      "integrity": "sha512-im9DjEDQ55s9fL4EYzOAv0yMqmMBSZp6G0VvFyTMPKWxiSBHUj9NW/qqLmXUwXrrM7AvqSlTCfvqRb0cM8yYqw==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "safer-buffer": ">= 2.1.2 < 3.0.0"
-      },
-      "engines": {
-        "node": ">=0.10.0"
-      },
-      "funding": {
-        "type": "opencollective",
-        "url": "https://opencollective.com/express"
-      }
-    },
     "node_modules/@isaacs/cliui": {
       "version": "8.0.2",
       "resolved": "https://registry.npmjs.org/@isaacs/cliui/-/cliui-8.0.2.tgz",
@@ -4075,22 +4058,21 @@
       "license": "MIT"
     },
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-      "resolved": "https://registry.npmjs.org/@types/express/-/express-4.17.25.tgz",
-      "integrity": "sha512-dVd04UKsfpINUnK0yBoYHDF3xu7xVH4BuDotC/xGuycx4CgbP48X/KF/586bcObxT0HENHXEU8Nqtu6NR+eKhw==",
+      "version": "5.0.6",
+      "resolved": "https://registry.npmjs.org/@types/express/-/express-5.0.6.tgz",
+      "integrity": "sha512-sKYVuV7Sv9fbPIt/442koC7+IIwK5olP1KWeD88e/idgoJqDm3JV/YUiPwkoKK92ylff2MGxSz1CSjsXelx0YA==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
         "@types/body-parser": "*",
-        "@types/express-serve-static-core": "^4.17.33",
-        "@types/qs": "*",
-        "@types/serve-static": "^1"
+        "@types/express-serve-static-core": "^5.0.0",
+        "@types/serve-static": "^2"
       }
     },
     "node_modules/@types/express-serve-static-core": {
-      "version": "4.19.8",
-      "resolved": "https://registry.npmjs.org/@types/express-serve-static-core/-/express-serve-static-core-4.19.8.tgz",
-      "integrity": "sha512-02S5fmqeoKzVZCHPZid4b8JH2eM5HzQLZWN2FohQEy/0eXTq8VXZfSN6Pcr3F6N9R/vNrj7cpgbhjie6m/1tCA==",
+      "version": "5.1.3",
+      "resolved": "https://registry.npmjs.org/@types/express-serve-static-core/-/express-serve-static-core-5.1.3.tgz",
+      "integrity": "sha512-dPfW8NFiOF4wOHc7+N/QSxlY9cfSsenewGbAz8C8U/MULPd/YZ27LvJUIlzaXie7e6Ove9YunJGgC9tbHD2cKw==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -4132,13 +4114,6 @@
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-      "resolved": "https://registry.npmjs.org/@types/mime/-/mime-1.3.5.tgz",
-      "integrity": "sha512-/pyBZWSLD2n0dcHE3hq8s8ZvcETHtEuF+3E7XVt0Ig2nvsVQXdghHVcEkIWjy9A0wKfTn97a/PSDYohKIlnP/w==",
-      "dev": true,
-      "license": "MIT"
-    },
     "node_modules/@types/ms": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/@types/ms/-/ms-2.1.0.tgz",
@@ -4155,9 +4130,9 @@
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-      "resolved": "https://registry.npmjs.org/@types/qs/-/qs-6.15.0.tgz",
-      "integrity": "sha512-JawvT8iBVWpzTrz3EGw9BTQFg3BQNmwERdKE22vlTxawwtbyUSlMppvZYKLZzB5zgACXdXxbD3m1bXaMqP/9ow==",
+      "version": "6.15.1",
+      "resolved": "https://registry.npmjs.org/@types/qs/-/qs-6.15.1.tgz",
+      "integrity": "sha512-GZHUBZR9hckSUhrxmp1nG6NwdpM9fCunJwyThLW1X3AyHgd9IlHb6VANpQQqDr2o/qQp6McZ3y/IA2rVzKzSbw==",
       "dev": true,
       "license": "MIT"
     },
@@ -4179,25 +4154,13 @@
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     },
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-      "version": "1.15.10",
-      "resolved": "https://registry.npmjs.org/@types/serve-static/-/serve-static-1.15.10.tgz",
-      "integrity": "sha512-tRs1dB+g8Itk72rlSI2ZrW6vZg0YrLI81iQSTkMmOqnqCaNr/8Ek4VwWcN5vZgCYWbg/JJSGBlUaYGAOP73qBw==",
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/@types/serve-static/-/serve-static-2.2.0.tgz",
+      "integrity": "sha512-8mam4H1NHLtu7nmtalF7eyBH14QyOASmcxHhSfEoRyr0nP/YdoesEtU+uSRvMe96TW/HPTtkoKqQLl53N7UXMQ==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
         "@types/http-errors": "*",
-        "@types/node": "*",
-        "@types/send": "<1"
-      }
-    },
-    "node_modules/@types/serve-static/node_modules/@types/send": {
-      "version": "0.17.6",
-      "resolved": "https://registry.npmjs.org/@types/send/-/send-0.17.6.tgz",
-      "integrity": "sha512-Uqt8rPBE8SY0RK8JB1EzVOIZ32uqy8HwdxCnoCOsYrvnswqmFZ/k+9Ikidlk/ImhsdvBsloHbAlewb2IEBV/Og==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "@types/mime": "^1",
         "@types/node": "*"
       }
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@@ -4635,18 +4598,43 @@
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-      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.8.tgz",
-      "integrity": "sha512-PYAthTa2m2VKxuvSD3DPC/Gy+U+sOA1LAuT8mkmRuvw+NACSaeXEQ+NHcVF7rONl6qcaxV3Uuemwawk+7+SJLw==",
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-2.0.0.tgz",
+      "integrity": "sha512-5cvg6CtKwfgdmVqY1WIiXKc3Q1bkRqGLi+2W/6ao+6Y7gu/RCwRuAhGEzh5B4KlszSuTLgZYuqFqo5bImjNKng==",
       "license": "MIT",
       "dependencies": {
-        "mime-types": "~2.1.34",
-        "negotiator": "0.6.3"
+        "mime-types": "^3.0.0",
+        "negotiator": "^1.0.0"
       },
       "engines": {
         "node": ">= 0.6"
       }
     },
+    "node_modules/accepts/node_modules/mime-db": {
+      "version": "1.54.0",
+      "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.54.0.tgz",
+      "integrity": "sha512-aU5EJuIN2WDemCcAp2vFBfp/m4EAhWJnUNSSw0ixs7/kXbd6Pg64EmwJkNdFhB8aWt1sH2CTXrLxo/iAGV3oPQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/accepts/node_modules/mime-types": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/mime-types/-/mime-types-3.0.2.tgz",
+      "integrity": "sha512-Lbgzdk0h4juoQ9fCKXW4by0UJqj+nOOrI9MJ1sSj4nI8aI2eo1qmvQEie4VD1glsS250n15LsWsYtCugiStS5A==",
+      "license": "MIT",
+      "dependencies": {
+        "mime-db": "^1.54.0"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
+    },
     "node_modules/acorn": {
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       "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.16.0.tgz",
@@ -4754,12 +4742,6 @@
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@@ -4969,44 +4951,42 @@
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-      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.20.6.tgz",
-      "integrity": "sha512-p5tAzS57i5MV9fZFDj9LeIiTZEufbSe2eDozP+ElheSUq1m74CRq1jI4mYNDdVs9vQztXFLuk/Gd6BWTdwRJ5g==",
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-2.3.0.tgz",
+      "integrity": "sha512-2cGmJupaNgg+QUwVLAucDuWuoMZ6EX9iHDRswZ5lsNYEmwPaRknMPCLZz07yTzVq/83p4o/wzbDZbBrTvGGTIw==",
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-        "content-type": "~1.0.5",
-        "debug": "2.6.9",
-        "depd": "2.0.0",
-        "destroy": "~1.2.0",
-        "http-errors": "~2.0.1",
-        "iconv-lite": "~0.4.24",
-        "on-finished": "~2.4.1",
-        "qs": "~6.15.1",
-        "raw-body": "~2.5.3",
-        "type-is": "~1.6.18",
-        "unpipe": "~1.0.0"
+        "bytes": "^3.1.2",
+        "content-type": "^2.0.0",
+        "debug": "^4.4.3",
+        "http-errors": "^2.0.1",
+        "iconv-lite": "^0.7.2",
+        "on-finished": "^2.4.1",
+        "qs": "^6.15.2",
+        "raw-body": "^3.0.2",
+        "type-is": "^2.1.0"
       },
       "engines": {
-        "node": ">= 0.8",
-        "npm": "1.2.8000 || >= 1.4.16"
+        "node": ">=18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
       }
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-    "node_modules/body-parser/node_modules/debug": {
-      "version": "2.6.9",
-      "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
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+    "node_modules/body-parser/node_modules/content-type": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/content-type/-/content-type-2.1.0.tgz",
+      "integrity": "sha512-mj7UPXE0jaqaOsukNZRUEfEi2AcL7C/vwmwcHV0O97eO1E1pxBZuyjlZrx5seTaNBg1U6+o35wpa35Qfcc+7ag==",
       "license": "MIT",
-      "dependencies": {
-        "ms": "2.0.0"
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
       }
     },
-    "node_modules/body-parser/node_modules/ms": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
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@@ -5486,15 +5466,16 @@
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+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-1.1.0.tgz",
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-      "dependencies": {
-        "safe-buffer": "5.2.1"
-      },
       "engines": {
-        "node": ">= 0.6"
+        "node": ">=18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
       }
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     "node_modules/content-type": {
@@ -5566,10 +5547,13 @@
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-      "license": "MIT"
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/cookie-signature/-/cookie-signature-1.2.2.tgz",
+      "integrity": "sha512-D76uU73ulSXrD1UXF4KE2TMxVVwhsnCgfAyTg9k8P6KGZjlXKrOLe4dJQKI3Bxi5wjesZoFXJWElNWBjPZMbhg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=6.6.0"
+      }
     },
     "node_modules/cookiejar": {
       "version": "2.1.4",
@@ -5728,16 +5712,6 @@
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-      "resolved": "https://registry.npmjs.org/destroy/-/destroy-1.2.0.tgz",
-      "integrity": "sha512-2sJGJTaXIIaR1w4iJSNoN0hnMY7Gpc/n8D4qSCJw8QqFWXf7cuAgnEHxBpweaVcPevC2l3KpjYCx3NypQQgaJg==",
-      "license": "MIT",
-      "engines": {
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-        "npm": "1.2.8000 || >= 1.4.16"
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@@ -6488,45 +6462,42 @@
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-        "body-parser": "~1.20.5",
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-        "cookie-signature": "~1.0.6",
-        "debug": "2.6.9",
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-        "encodeurl": "~2.0.0",
-        "escape-html": "~1.0.3",
-        "etag": "~1.8.1",
-        "finalhandler": "~1.3.1",
-        "fresh": "~0.5.2",
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-        "setprototypeof": "1.2.0",
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-        "type-is": "~1.6.18",
-        "utils-merge": "1.0.1",
-        "vary": "~1.1.2"
-      },
-      "engines": {
-        "node": ">= 0.10.0"
+      "version": "5.2.1",
+      "resolved": "https://registry.npmjs.org/express/-/express-5.2.1.tgz",
+      "integrity": "sha512-hIS4idWWai69NezIdRt2xFVofaF4j+6INOpJlVOLDO8zXGpUVEVzIYk12UUi2JzjEzWL3IOAxcTubgz9Po0yXw==",
+      "license": "MIT",
+      "dependencies": {
+        "accepts": "^2.0.0",
+        "body-parser": "^2.2.1",
+        "content-disposition": "^1.0.0",
+        "content-type": "^1.0.5",
+        "cookie": "^0.7.1",
+        "cookie-signature": "^1.2.1",
+        "debug": "^4.4.0",
+        "depd": "^2.0.0",
+        "encodeurl": "^2.0.0",
+        "escape-html": "^1.0.3",
+        "etag": "^1.8.1",
+        "finalhandler": "^2.1.0",
+        "fresh": "^2.0.0",
+        "http-errors": "^2.0.0",
+        "merge-descriptors": "^2.0.0",
+        "mime-types": "^3.0.0",
+        "on-finished": "^2.4.1",
+        "once": "^1.4.0",
+        "parseurl": "^1.3.3",
+        "proxy-addr": "^2.0.7",
+        "qs": "^6.14.0",
+        "range-parser": "^1.2.1",
+        "router": "^2.2.0",
+        "send": "^1.1.0",
+        "serve-static": "^2.2.0",
+        "statuses": "^2.0.1",
+        "type-is": "^2.0.1",
+        "vary": "^1.1.2"
+      },
+      "engines": {
+        "node": ">= 18"
       },
       "funding": {
         "type": "opencollective",
@@ -6582,20 +6553,30 @@
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-    "node_modules/express/node_modules/debug": {
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-      "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
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+    "node_modules/express/node_modules/mime-db": {
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-      "license": "MIT"
+    "node_modules/send/node_modules/mime-types": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/mime-types/-/mime-types-3.0.2.tgz",
+      "integrity": "sha512-Lbgzdk0h4juoQ9fCKXW4by0UJqj+nOOrI9MJ1sSj4nI8aI2eo1qmvQEie4VD1glsS250n15LsWsYtCugiStS5A==",
+      "license": "MIT",
+      "dependencies": {
+        "mime-db": "^1.54.0"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
     },
     "node_modules/sequelize": {
       "version": "6.37.8",
@@ -10346,18 +10347,22 @@
       }
     },
     "node_modules/serve-static": {
-      "version": "1.16.3",
-      "resolved": "https://registry.npmjs.org/serve-static/-/serve-static-1.16.3.tgz",
-      "integrity": "sha512-x0RTqQel6g5SY7Lg6ZreMmsOzncHFU7nhnRWkKgWuMTu5NN0DR5oruckMqRvacAN9d5w6ARnRBXl9xhDCgfMeA==",
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/serve-static/-/serve-static-2.2.1.tgz",
+      "integrity": "sha512-xRXBn0pPqQTVQiC8wyQrKs2MOlX24zQ0POGaj0kultvoOCstBQM5yvOhAVSUwOMjQtTvsPWoNCHfPGwaaQJhTw==",
       "license": "MIT",
       "dependencies": {
-        "encodeurl": "~2.0.0",
-        "escape-html": "~1.0.3",
-        "parseurl": "~1.3.3",
-        "send": "~0.19.1"
+        "encodeurl": "^2.0.0",
+        "escape-html": "^1.0.3",
+        "parseurl": "^1.3.3",
+        "send": "^1.2.0"
       },
       "engines": {
-        "node": ">= 0.8.0"
+        "node": ">= 18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
       }
     },
     "node_modules/setprototypeof": {
@@ -10894,16 +10899,6 @@
         "node": ">=14.18.0"
       }
     },
-    "node_modules/supertest/node_modules/cookie-signature": {
-      "version": "1.2.2",
-      "resolved": "https://registry.npmjs.org/cookie-signature/-/cookie-signature-1.2.2.tgz",
-      "integrity": "sha512-D76uU73ulSXrD1UXF4KE2TMxVVwhsnCgfAyTg9k8P6KGZjlXKrOLe4dJQKI3Bxi5wjesZoFXJWElNWBjPZMbhg==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">=6.6.0"
-      }
-    },
     "node_modules/supports-color": {
       "version": "7.2.0",
       "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
@@ -11262,18 +11257,61 @@
       }
     },
     "node_modules/type-is": {
-      "version": "1.6.18",
-      "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.18.tgz",
-      "integrity": "sha512-TkRKr9sUTxEH8MdfuCSP7VizJyzRNMjj2J2do2Jr3Kym598JVdEksuzPQCnlFPW4ky9Q+iA+ma9BGm06XQBy8g==",
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/type-is/-/type-is-2.1.0.tgz",
+      "integrity": "sha512-faYHw0anBbc/kWF3zFTEnxSFOAGUX9GFbOBthvDdLsIlEoWOFOtS0zgCiQYwIskL9iGXZL3kAXD8OoZ4GmMATA==",
       "license": "MIT",
       "dependencies": {
-        "media-typer": "0.3.0",
-        "mime-types": "~2.1.24"
+        "content-type": "^2.0.0",
+        "media-typer": "^1.1.0",
+        "mime-types": "^3.0.0"
       },
+      "engines": {
+        "node": ">= 18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
+    },
+    "node_modules/type-is/node_modules/content-type": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/content-type/-/content-type-2.1.0.tgz",
+      "integrity": "sha512-mj7UPXE0jaqaOsukNZRUEfEi2AcL7C/vwmwcHV0O97eO1E1pxBZuyjlZrx5seTaNBg1U6+o35wpa35Qfcc+7ag==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
+    },
+    "node_modules/type-is/node_modules/mime-db": {
+      "version": "1.54.0",
+      "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.54.0.tgz",
+      "integrity": "sha512-aU5EJuIN2WDemCcAp2vFBfp/m4EAhWJnUNSSw0ixs7/kXbd6Pg64EmwJkNdFhB8aWt1sH2CTXrLxo/iAGV3oPQ==",
+      "license": "MIT",
       "engines": {
         "node": ">= 0.6"
       }
     },
+    "node_modules/type-is/node_modules/mime-types": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/mime-types/-/mime-types-3.0.2.tgz",
+      "integrity": "sha512-Lbgzdk0h4juoQ9fCKXW4by0UJqj+nOOrI9MJ1sSj4nI8aI2eo1qmvQEie4VD1glsS250n15LsWsYtCugiStS5A==",
+      "license": "MIT",
+      "dependencies": {
+        "mime-db": "^1.54.0"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
+    },
     "node_modules/typescript": {
       "version": "5.9.3",
       "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
@@ -11377,15 +11415,6 @@
       "integrity": "sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw==",
       "license": "MIT"
     },
-    "node_modules/utils-merge": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
-      "integrity": "sha512-pMZTvIkT1d+TFGvDOqodOclx0QWkkgi6Tdoa8gC8ffGAAqz9pzPTZWAybbsHHoED/ztMtkv/VoYTYyShUn81hA==",
-      "license": "MIT",
-      "engines": {
-        "node": ">= 0.4.0"
-      }
-    },
     "node_modules/uuid": {
       "version": "8.3.2",
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-8.3.2.tgz",
@@ -11811,7 +11840,6 @@
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
       "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==",
-      "dev": true,
       "license": "ISC"
     },
     "node_modules/xmlbuilder": {
diff --git a/package.json b/package.json
index 8f1c351..16d1f5c 100644
--- a/package.json
+++ b/package.json
@@ -56,7 +56,7 @@
     "base64url": "^3.0.1",
     "bcrypt-ts": "^7.1.0",
     "cors": "^2.8.5",
-    "express": "^4.19.2",
+    "express": "^5.2.1",
     "express-rate-limit": "^7.5.0",
     "express-slow-down": "^3.1.1",
     "helmet": "^8.3.0",
@@ -78,7 +78,7 @@
     "@commitlint/config-conventional": "^20.5.0",
     "@eslint/js": "^10.0.1",
     "@types/cors": "^2.8.17",
-    "@types/express": "^4.17.24",
+    "@types/express": "^5.0.6",
     "@types/jsonwebtoken": "^9.0.6",
     "@types/node": "^24.10.1",
     "@types/supertest": "^6.0.3",
diff --git a/src/app.ts b/src/app.ts
index f4e6dbe..34aa7ae 100644
--- a/src/app.ts
+++ b/src/app.ts
@@ -32,6 +32,12 @@ if (trustProxy) {
   app.set('trust proxy', Number.isNaN(hops) ? trustProxy : hops);
 }
 
+// Express 5 changed the default query parser from "extended" to "simple". Pinned rather
+// than inherited so an upgrade never silently changes how a caller's query string parses:
+// this API is the contract source for the SDKs and the console, and none of them opted
+// into a narrower parser.
+app.set('query parser', 'extended');
+
 const rawOrigin = process.env.APP_ORIGINS!.split(',');
 
 export const CORS_REJECTION = 'Not allowed by CORS';
diff --git a/src/controllers/admin.ts b/src/controllers/admin.ts
index e3265fe..535e9ec 100644
--- a/src/controllers/admin.ts
+++ b/src/controllers/admin.ts
@@ -31,7 +31,7 @@ import { serializeAuthEvents } from '../services/authEventSerialization.js';
 import { AuthEventService } from '../services/authEventService.js';
 import { hardRevokeSession } from '../services/sessionService.js';
 import type { AuthenticatedRequest } from '../types/types.js';
-import { ServiceRequest } from '../types/types.js';
+import { RouteRequest, ServiceRequest } from '../types/types.js';
 import getLogger from '../utils/logger.js';
 import { redactMetadata } from '../utils/redaction.js';
 import { isValidPhoneNumber, normalizePhoneNumber } from '../utils/utils.js';
@@ -167,7 +167,7 @@ export const createUser = async (req: Request, res: Response) => {
 
 export const deleteUser = async (req: ServiceRequest, res: Response) => {
   logger.info('Internal deletion call made.');
-  const { userId } = req.body;
+  const { userId } = req.body ?? {};
 
   if (!userId) {
     return res.status(404).json({ error: 'User not found.' });
@@ -412,7 +412,7 @@ export const listUserSessions = async (req: Request, res: Response) => {
   }
 };
 
-export const revokeAllUserSessions = async (req: Request, res: Response) => {
+export const revokeAllUserSessions = async (req: RouteRequest, res: Response) => {
   const { userId } = req.params;
 
   try {
@@ -483,7 +483,7 @@ export const revokeUserSessionById = async (req: Request, res: Response) => {
   }
 };
 
-export const recoverUserForDeviceReplacement = async (req: Request, res: Response) => {
+export const recoverUserForDeviceReplacement = async (req: RouteRequest, res: Response) => {
   const { userId } = req.params;
   const parsed = DeviceReplacementRecoverySchema.safeParse(req.body ?? {});
 
diff --git a/src/controllers/magicLinks.ts b/src/controllers/magicLinks.ts
index 3be7e7f..95b6339 100644
--- a/src/controllers/magicLinks.ts
+++ b/src/controllers/magicLinks.ts
@@ -17,7 +17,7 @@ import { getLoginPolicy, isLoginMethodEnabled } from '../services/loginPolicySer
 import { sendMagicLinkEmail } from '../services/messagingService.js';
 import { issueSessionAndRespond } from '../services/sessionIssuance.js';
 import { invalidateChallengesForUser } from '../services/webauthnChallengeService.js';
-import { AuthenticatedRequest } from '../types/types.js';
+import { AuthenticatedRequest, RouteRequest } from '../types/types.js';
 import getLogger from '../utils/logger.js';
 import { hashDeviceFingerprint, hashSha256 } from '../utils/utils.js';
 
@@ -142,7 +142,7 @@ export async function requestMagicLink(req: Request, res: Response) {
   });
 }
 
-export async function verifyMagicLink(req: Request, res: Response) {
+export async function verifyMagicLink(req: RouteRequest, res: Response) {
   logger.debug('Verifying magic link');
   const { token } = req.params;
 
diff --git a/src/controllers/oauth.ts b/src/controllers/oauth.ts
index e943ab6..7e0f1f2 100644
--- a/src/controllers/oauth.ts
+++ b/src/controllers/oauth.ts
@@ -25,6 +25,7 @@ import {
   verifyOAuthState,
 } from '../services/oauthService.js';
 import { issueSessionAndRespond } from '../services/sessionIssuance.js';
+import { RouteRequest } from '../types/types.js';
 import getLogger from '../utils/logger.js';
 
 const logger = getLogger('oauth');
@@ -48,7 +49,7 @@ export async function listOAuthProviders(_req: Request, res: Response) {
   });
 }
 
-export async function startOAuthLogin(req: Request, res: Response) {
+export async function startOAuthLogin(req: RouteRequest, res: Response) {
   const { providerId } = req.params;
   const provider = await getOAuthProvider(providerId);
 
@@ -100,7 +101,7 @@ export async function startOAuthLogin(req: Request, res: Response) {
   }
 }
 
-export async function finishOAuthLogin(req: Request, res: Response) {
+export async function finishOAuthLogin(req: RouteRequest, res: Response) {
   const { providerId } = req.params;
   const { code, state } = req.body;
   const provider = await getOAuthProvider(providerId);
diff --git a/src/controllers/organizations.ts b/src/controllers/organizations.ts
index 7c44f86..3a93a3e 100644
--- a/src/controllers/organizations.ts
+++ b/src/controllers/organizations.ts
@@ -28,7 +28,7 @@ import {
   serializeMembership,
   serializeOrganization,
 } from '../services/organizationService.js';
-import { AuthenticatedRequest } from '../types/types.js';
+import { AuthenticatedRequest, RouteRequest } from '../types/types.js';
 import { parseDurationToSeconds } from '../utils/utils.js';
 
 function authUser(req: Request) {
@@ -73,7 +73,7 @@ export async function createOrganization(req: Request, res: Response) {
   });
 }
 
-export async function getOrganization(req: Request, res: Response) {
+export async function getOrganization(req: RouteRequest, res: Response) {
   const user = authUser(req);
   const { organizationId } = req.params;
   const { organization, membership } = await requireOrganizationAccess(user, organizationId);
@@ -87,7 +87,7 @@ export async function getOrganization(req: Request, res: Response) {
   });
 }
 
-export async function updateOrganization(req: Request, res: Response) {
+export async function updateOrganization(req: RouteRequest, res: Response) {
   const user = authUser(req);
   const { organizationId } = req.params;
   const { organization, membership } = await requireOrganizationManager(user, organizationId);
@@ -117,7 +117,7 @@ export async function updateOrganization(req: Request, res: Response) {
   });
 }
 
-export async function switchOrganization(req: Request, res: Response) {
+export async function switchOrganization(req: RouteRequest, res: Response) {
   const user = authUser(req);
   const { organizationId } = req.params;
   const sessionId = currentSessionId(req);
@@ -157,7 +157,7 @@ export async function switchOrganization(req: Request, res: Response) {
   });
 }
 
-export async function listMembers(req: Request, res: Response) {
+export async function listMembers(req: RouteRequest, res: Response) {
   const user = authUser(req);
   const { organizationId } = req.params;
   const { organization, membership } = await requireOrganizationAccess(user, organizationId);
@@ -170,7 +170,7 @@ export async function listMembers(req: Request, res: Response) {
   return res.json({ members, total: members.length });
 }
 
-export async function addMember(req: Request, res: Response) {
+export async function addMember(req: RouteRequest, res: Response) {
   const user = authUser(req);
   const { organizationId } = req.params;
   const { organization } = await requireOrganizationManager(user, organizationId);
@@ -205,7 +205,7 @@ export async function addMember(req: Request, res: Response) {
   });
 }
 
-export async function updateMember(req: Request, res: Response) {
+export async function updateMember(req: RouteRequest, res: Response) {
   const user = authUser(req);
   const { organizationId, userId } = req.params;
   const { organization } = await requireOrganizationManager(user, organizationId);
@@ -245,7 +245,7 @@ export async function updateMember(req: Request, res: Response) {
   });
 }
 
-export async function removeMember(req: Request, res: Response) {
+export async function removeMember(req: RouteRequest, res: Response) {
   const user = authUser(req);
   const { organizationId, userId } = req.params;
   const { organization } = await requireOrganizationManager(user, organizationId);
diff --git a/src/lib/adminDashboard.ts b/src/lib/adminDashboard.ts
index 53b5e50..0bc6e8e 100644
--- a/src/lib/adminDashboard.ts
+++ b/src/lib/adminDashboard.ts
@@ -84,7 +84,8 @@ export function mountAdminDashboard(app: Express): boolean {
   };
 
   app.get(ADMIN_DASHBOARD_BASE_PATH, sendIndex);
-  app.get(`${ADMIN_DASHBOARD_BASE_PATH}/*`, sendIndex);
+  // Named wildcard: path-to-regexp v8 (Express 5) rejects a bare "*".
+  app.get(`${ADMIN_DASHBOARD_BASE_PATH}/*splat`, sendIndex);
 
   logger.info(`Serving admin dashboard at ${ADMIN_DASHBOARD_BASE_PATH} from ${dir}.`);
   return true;
diff --git a/src/lib/defineRoute.ts b/src/lib/defineRoute.ts
index 111e817..4f59313 100644
--- a/src/lib/defineRoute.ts
+++ b/src/lib/defineRoute.ts
@@ -4,7 +4,7 @@
  * See LICENSE file in the project root for full license information
  */
 
-import { NextFunction, RequestHandler, Response, Router } from 'express';
+import { NextFunction, Request, RequestHandler, Response, Router } from 'express';
 import { ZodError, ZodTypeAny } from 'zod';
 
 import { attachAuthMiddleware } from '../middleware/attachAuthMiddleware.js';
@@ -180,6 +180,21 @@ function resolveAuthType(
   return undefined;
 }
 
+/**
+ * Express 5 exposes `req.query` as a getter with no setter, and one that re-parses the
+ * URL on every read, so a plain assignment throws and would discard the coercions the
+ * schema just applied. Shadowing the accessor with an own data property is what makes
+ * the validated query stick for the rest of the request.
+ */
+function setQuery(req: Request, value: Request['query']) {
+  Object.defineProperty(req, 'query', {
+    value,
+    writable: true,
+    configurable: true,
+    enumerable: true,
+  });
+}
+
 export function defineRoute<S extends RouteSchemas>(
   router: Router,
   options: DefineRouteOptions<S>,
@@ -224,11 +239,14 @@ export function defineRoute<S extends RouteSchemas>(
       }
 
       if (query) {
-        req.query = query.parse(req.query) as typeof req.query;
+        setQuery(req, query.parse(req.query) as typeof req.query);
       }
 
       if (body) {
-        req.body = body.parse(req.body) as typeof req.body;
+        // Express 5 leaves req.body undefined when no body was parsed. Validating that
+        // as {} keeps a body-less request reporting its missing fields rather than one
+        // opaque "expected object, received undefined".
+        req.body = body.parse(req.body ?? {}) as typeof req.body;
       }
 
       return next();
diff --git a/src/types/types.ts b/src/types/types.ts
index 3f28f64..b184410 100644
--- a/src/types/types.ts
+++ b/src/types/types.ts
@@ -9,14 +9,24 @@ import { Request } from 'express';
 import { Session } from '../models/sessions.js';
 import { User } from '../models/users.js';
 
-export interface AuthenticatedRequest extends Request {
+/**
+ * A request whose route params are single-valued.
+ *
+ * Express 5 widens `req.params` to `string | string[]` because path-to-regexp v8 can
+ * repeat a param (`:name*`, `*splat`). Every API route here uses plain `:name` segments,
+ * which never repeat, so the array half is unreachable for them. Handlers on a wildcard
+ * route must keep the wider `Request` type.
+ */
+export type RouteRequest = Request<Record<string, string>>;
+
+export interface AuthenticatedRequest extends RouteRequest {
   user: User;
   sessionId: Session['id'];
   organizationId?: string | null;
   clientId?: string;
   trustedClientIp?: string;
 }
-export interface ServiceRequest extends Request {
+export interface ServiceRequest extends RouteRequest {
   clientId?: string | (() => string);
   triggeredBy?: string;
   trustedClientIp?: string;
diff --git a/tests/integration/admin/admin.spec.ts b/tests/integration/admin/admin.spec.ts
index d5a9bff..b80fe2c 100644
--- a/tests/integration/admin/admin.spec.ts
+++ b/tests/integration/admin/admin.spec.ts
@@ -61,6 +61,15 @@ describe('DELETE /admin/users', () => {
 
     expect(res.status).toBe(404);
   });
+
+  // Express 5 leaves req.body undefined when nothing was parsed, so a request with no
+  // body at all must not be read as if it were an object.
+  it('returns 404 when the request carries no body', async () => {
+    const res = await request(app).delete('/admin/users');
+
+    expect(res.status).toBe(404);
+    expect(res.body).toEqual({ error: 'User not found.' });
+  });
 });
 
 describe('GET /admin/users/:userId', () => {
diff --git a/tests/unit/app.spec.ts b/tests/unit/app.spec.ts
index c7772fd..797a573 100644
--- a/tests/unit/app.spec.ts
+++ b/tests/unit/app.spec.ts
@@ -26,6 +26,9 @@ beforeAll(async () => {
     next(malformed);
   });
   app.get('/__test_plain_error', (_req, _res, next) => next(new Error('plain failure')));
+  app.get('/__test_query', (req, res) => {
+    res.status(200).json({ query: req.query });
+  });
   built = await createApp();
 });
 
@@ -114,6 +117,17 @@ describe('developer endpoints', () => {
   });
 });
 
+describe('query parsing', () => {
+  // Express 5 defaults to the "simple" parser, which would read a[b] as the literal key
+  // "a[b]" and drop repeated keys into a different shape than callers were built against.
+  it('parses nested and repeated keys the extended way', async () => {
+    const res = await request(built).get('/__test_query?a[b]=1&type=x&type=y');
+
+    expect(res.status).toBe(200);
+    expect(res.body.query).toEqual({ a: { b: '1' }, type: ['x', 'y'] });
+  });
+});
+
 describe('createApp error handling', () => {
   it('passes non-CORS errors through to the not-found handler', async () => {
     const res = await request(built).get('/__test_plain_error');