diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index af422918..3c8a2adb 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -26,6 +26,11 @@ deno task bundle
 The build checks DOM and Web Worker consumers in `tests/types/public-api.ts`,
 including the distinction between type-only and runtime exports.
 
+Declaration generation requires TypeScript's JavaScript compiler API. The build
+uses TypeScript 6; TypeScript 7's native API is not a drop-in replacement. This
+restriction does not limit the TypeScript versions supported by library
+consumers.
+
 **How to check if your new code is standard JS style**
 
 ```bash
diff --git a/build/bun.lock b/build/bun.lock
index 79b68eb8..2dda0ad9 100644
--- a/build/bun.lock
+++ b/build/bun.lock
@@ -5,14 +5,11 @@
     "": {
       "name": "@poolifier/poolifier-web-worker-build",
       "dependencies": {
-        "typescript": "^7.0.2",
+        "typescript": "^6.0.3",
       },
     },
   },
-  "overrides": {
-    "typescript": "^5.9.3",
-  },
   "packages": {
-    "typescript": ["typescript@5.9.3", "", { "bin": { "tsc": "bin/tsc", "tsserver": "bin/tsserver" } }, "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw=="],
+    "typescript": ["typescript@6.0.3", "", { "bin": { "tsc": "bin/tsc", "tsserver": "bin/tsserver" } }, "sha512-y2TvuxSZPDyQakkFRPZHKFm+KKVqIisdg9/CZwm9ftvKXLP8NRWj38/ODjNbr43SsoXqNuAisEf1GdCxqWcdBw=="],
   }
 }
diff --git a/build/package.json b/build/package.json
index 4746d82b..3e8fcdbf 100644
--- a/build/package.json
+++ b/build/package.json
@@ -5,15 +5,6 @@
   "private": true,
   "type": "module",
   "dependencies": {
-    "typescript": "^7.0.2"
-  },
-  "overrides": {
-    "typescript": "^5.9.3"
-  },
-  "overrides": {
-    "typescript": "^5.9.3"
-  },
-  "overrides": {
-    "typescript": "^7.0.0"
+    "typescript": "^6.0.3"
   }
 }
diff --git a/renovate.json b/renovate.json
index 08ab1f89..6a4666b3 100644
--- a/renovate.json
+++ b/renovate.json
@@ -27,6 +27,12 @@
     {
       "matchFileNames": ["**/deno.json"],
       "rangeStrategy": "bump"
+    },
+    {
+      "description": "Keep the build on the JavaScript compiler API; TypeScript 7 is not API-compatible.",
+      "matchFileNames": ["build/package.json"],
+      "matchPackageNames": ["typescript"],
+      "allowedVersions": "<7"
     }
   ],
   "ignorePaths": [