diff --git a/apps/hash-api/package.json b/apps/hash-api/package.json
index 35e9655c2ff..b9ec4755d0a 100644
--- a/apps/hash-api/package.json
+++ b/apps/hash-api/package.json
@@ -73,7 +73,7 @@
     "cors": "2.8.5",
     "cross-env": "7.0.3",
     "dedent": "0.7.0",
-    "effect": "3.12.0",
+    "effect": "3.12.1",
     "exponential-backoff": "3.1.1",
     "express": "4.21.2",
     "express-handlebars": "7.1.3",
diff --git a/libs/@local/eslint/package.json b/libs/@local/eslint/package.json
index e62689ed451..fa373462746 100644
--- a/libs/@local/eslint/package.json
+++ b/libs/@local/eslint/package.json
@@ -24,7 +24,7 @@
     "@babel/eslint-parser": "7.25.9",
     "@eslint/compat": "1.2.4",
     "@eslint/eslintrc": "3.2.0",
-    "effect": "3.12.0",
+    "effect": "3.12.1",
     "eslint": "9.17.0",
     "eslint-config-airbnb": "19.0.4",
     "eslint-config-flat-gitignore": "0.3.0",
diff --git a/libs/@local/graph/sdk/typescript/package.json b/libs/@local/graph/sdk/typescript/package.json
index c416da00ff3..8959e365a60 100644
--- a/libs/@local/graph/sdk/typescript/package.json
+++ b/libs/@local/graph/sdk/typescript/package.json
@@ -28,7 +28,7 @@
     "@local/harpc-client": "0.0.0-private",
     "@local/hash-graph-client": "0.0.0-private",
     "@local/hash-graph-types": "0.0.0-private",
-    "effect": "3.12.0"
+    "effect": "3.12.1"
   },
   "devDependencies": {
     "@local/eslint": "0.0.0-private",
diff --git a/libs/@local/harpc/client/typescript/package.json b/libs/@local/harpc/client/typescript/package.json
index e7f4c81df43..f7002a35835 100644
--- a/libs/@local/harpc/client/typescript/package.json
+++ b/libs/@local/harpc/client/typescript/package.json
@@ -32,15 +32,15 @@
     "@libp2p/tcp": "10.0.14",
     "@multiformats/dns": "1.0.6",
     "@multiformats/multiaddr": "12.3.4",
-    "effect": "3.12.0",
+    "effect": "3.12.1",
     "it-stream-types": "2.0.2",
     "libp2p": "2.4.2",
     "multiformats": "13.3.1",
     "uint8arraylist": "2.4.8"
   },
   "devDependencies": {
-    "@effect/platform": "0.72.0",
-    "@effect/platform-node": "0.68.0",
+    "@effect/platform": "0.72.1",
+    "@effect/platform-node": "0.68.1",
     "@effect/vitest": "0.16.1",
     "@local/eslint": "0.0.0-private",
     "@local/tsconfig": "0.0.0-private",
diff --git a/yarn.lock b/yarn.lock
index c09d54aacc4..2fd152978df 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -412,7 +412,7 @@ __metadata:
     cors: "npm:2.8.5"
     cross-env: "npm:7.0.3"
     dedent: "npm:0.7.0"
-    effect: "npm:3.12.0"
+    effect: "npm:3.12.1"
     eslint: "npm:9.17.0"
     exponential-backoff: "npm:3.1.1"
     express: "npm:4.21.2"
@@ -5798,43 +5798,43 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@effect/platform-node-shared@npm:^0.22.0":
-  version: 0.22.0
-  resolution: "@effect/platform-node-shared@npm:0.22.0"
+"@effect/platform-node-shared@npm:^0.22.1":
+  version: 0.22.1
+  resolution: "@effect/platform-node-shared@npm:0.22.1"
   dependencies:
     "@parcel/watcher": "npm:^2.4.1"
     multipasta: "npm:^0.2.5"
   peerDependencies:
-    "@effect/platform": ^0.72.0
-    effect: ^3.12.0
-  checksum: 10c0/3c4b669bb0f19b875b2b3c9c767b78b34c590c49c7ef23311d0b1f04b47db335a1a47ef07706da4009887b1fab344c72ea81a576875ab3f0254edf14cfa2e16e
+    "@effect/platform": ^0.72.1
+    effect: ^3.12.1
+  checksum: 10c0/5b352983e12aaad25ad8960b855e8c36cebba4ded6fc420b7e69c7f3c7389a87e46733e4890a97364dcd77d03bf44845729fde8570afb08c8ff30550e51e0a77
   languageName: node
   linkType: hard
 
-"@effect/platform-node@npm:0.68.0":
-  version: 0.68.0
-  resolution: "@effect/platform-node@npm:0.68.0"
+"@effect/platform-node@npm:0.68.1":
+  version: 0.68.1
+  resolution: "@effect/platform-node@npm:0.68.1"
   dependencies:
-    "@effect/platform-node-shared": "npm:^0.22.0"
+    "@effect/platform-node-shared": "npm:^0.22.1"
     mime: "npm:^3.0.0"
     undici: "npm:^7.1.0"
     ws: "npm:^8.18.0"
   peerDependencies:
-    "@effect/platform": ^0.72.0
-    effect: ^3.12.0
-  checksum: 10c0/e9684cdf49685b7bd51e21b0e9c3668a867e0eee704ccc89530460f6dca1997fff75f4c95b492d2e5ac472e4153531a6ed8e7eda88ffb79b2e43d7a5df5f8d65
+    "@effect/platform": ^0.72.1
+    effect: ^3.12.1
+  checksum: 10c0/7573977aeeafe534ceeaa58bb19067e8574cbab7ab6620a583b7aac893548937a31baa96c33e68762a1497addc20cd1cbfed983e767de3e2e0f5ae03f66bf773
   languageName: node
   linkType: hard
 
-"@effect/platform@npm:0.72.0":
-  version: 0.72.0
-  resolution: "@effect/platform@npm:0.72.0"
+"@effect/platform@npm:0.72.1":
+  version: 0.72.1
+  resolution: "@effect/platform@npm:0.72.1"
   dependencies:
     find-my-way-ts: "npm:^0.1.5"
     multipasta: "npm:^0.2.5"
   peerDependencies:
-    effect: ^3.12.0
-  checksum: 10c0/55e2c5d3f851b2527b833c34b8486a6bf214642c62d9330cc0e5f3746011038613a2848c77b0aa0296ccf505098421c8d384d351050a9ff4b96645d808fc76ff
+    effect: ^3.12.1
+  checksum: 10c0/6d47edf777202272b78662c749b2f818f475258fdb2aaefbbd5d56301f9d5b9e9ac9595e1950d2e7127ff020a6bf207981b6ed99bd9ee8f06e88deccfdbf25d6
   languageName: node
   linkType: hard
 
@@ -9299,7 +9299,7 @@ __metadata:
     "@types/babel__core": "npm:^7"
     "@types/eslint__eslintrc": "npm:2.1.2"
     "@types/node": "npm:22.10.5"
-    effect: "npm:3.12.0"
+    effect: "npm:3.12.1"
     eslint: "npm:9.17.0"
     eslint-config-airbnb: "npm:19.0.4"
     eslint-config-flat-gitignore: "npm:0.3.0"
@@ -9324,8 +9324,8 @@ __metadata:
   dependencies:
     "@chainsafe/libp2p-noise": "npm:16.0.0"
     "@chainsafe/libp2p-yamux": "npm:7.0.1"
-    "@effect/platform": "npm:0.72.0"
-    "@effect/platform-node": "npm:0.68.0"
+    "@effect/platform": "npm:0.72.1"
+    "@effect/platform-node": "npm:0.68.1"
     "@effect/vitest": "npm:0.16.1"
     "@libp2p/crypto": "npm:5.0.8"
     "@libp2p/identify": "npm:3.0.14"
@@ -9339,7 +9339,7 @@ __metadata:
     "@rust/harpc-wire-protocol": "npm:0.0.0-private"
     "@types/node": "npm:22.10.5"
     "@vitest/coverage-istanbul": "npm:2.1.8"
-    effect: "npm:3.12.0"
+    effect: "npm:3.12.1"
     eslint: "npm:9.17.0"
     it-stream-types: "npm:2.0.2"
     libp2p: "npm:2.4.2"
@@ -9427,7 +9427,7 @@ __metadata:
     "@local/hash-graph-types": "npm:0.0.0-private"
     "@local/tsconfig": "npm:0.0.0-private"
     "@vitest/coverage-istanbul": "npm:2.1.8"
-    effect: "npm:3.12.0"
+    effect: "npm:3.12.1"
     eslint: "npm:9.17.0"
     rimraf: "npm:6.0.1"
     typescript: "npm:5.7.2"
@@ -25604,12 +25604,12 @@ __metadata:
   languageName: node
   linkType: hard
 
-"effect@npm:3.12.0":
-  version: 3.12.0
-  resolution: "effect@npm:3.12.0"
+"effect@npm:3.12.1":
+  version: 3.12.1
+  resolution: "effect@npm:3.12.1"
   dependencies:
     fast-check: "npm:^3.23.1"
-  checksum: 10c0/b0719886e39c11c4e5715c8b2b1e8af0c43eb11877b07d1489629b79b7b576a03721bbff4dd6f08a503ee4379aaae874909cb50677f76397bcec8d8999960760
+  checksum: 10c0/40fc3ec78c4d6968efba1ed393b6dce09c6bb070e2790bc0bb12f495b66792a1a0b2392c33ac57a7b025be84152add3917a143ec004d3f17ed68516dd3155422
   languageName: node
   linkType: hard