diff --git a/.changeset/raise-effect-peer-floor.md b/.changeset/raise-effect-peer-floor.md
new file mode 100644
index 0000000..4e4165e
--- /dev/null
+++ b/.changeset/raise-effect-peer-floor.md
@@ -0,0 +1,5 @@
+---
+"@systemfsoftware/discern": patch
+---
+
+Requires Effect ^4.1.2.
diff --git a/pnpm-workspace.yaml b/pnpm-workspace.yaml
index ed0d365..a75b760 100644
--- a/pnpm-workspace.yaml
+++ b/pnpm-workspace.yaml
@@ -60,7 +60,7 @@ catalog:
 catalogMode: prefer
 catalogs:
   peers:
-    effect: ^4.1.0
+    effect: ^4.1.2
   oxlint:
     oxlint: ~1.88.0
     "@oxlint/plugins": ~1.88.0