diff --git a/package.json b/package.json
index 89812725..fec2e2e5 100644
--- a/package.json
+++ b/package.json
@@ -36,7 +36,7 @@
     "toucan-js": "^4.1.1"
   },
   "devDependencies": {
-    "@cloudflare/workers-types": "^4.20260624.1",
+    "@cloudflare/workers-types": "^5.20260719.1",
     "@eslint/compat": "^2.1.0",
     "@eslint/eslintrc": "^3.3.6",
     "@eslint/js": "^10.0.1",
diff --git a/yarn.lock b/yarn.lock
index 443bef5e..3a0077ac 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -509,10 +509,10 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@cloudflare/workers-types@npm:^4.20260624.1":
-  version: 4.20260624.1
-  resolution: "@cloudflare/workers-types@npm:4.20260624.1"
-  checksum: 10/5fab7837d4cb506e945d66e4459f0476700e33ada8364e514b102496a1cf3e6412dc9d09e22d6c02559a9b83b9da119cae71cad0d60ef6389a3b92b9131c2bfd
+"@cloudflare/workers-types@npm:^5.20260719.1":
+  version: 5.20260719.1
+  resolution: "@cloudflare/workers-types@npm:5.20260719.1"
+  checksum: 10/a1bb540d2357d52d86c46f24a6cc2e299604c3471a22d921f6d014b8c931a46d0f14ca8cd3e92d4d78e1f2c3ccbec0446fe69314af31f275144478c3ebff4724
   languageName: node
   linkType: hard
 
@@ -1805,7 +1805,7 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "@serlo/serlo.org-cloudflare-worker@workspace:."
   dependencies:
-    "@cloudflare/workers-types": "npm:^4.20260624.1"
+    "@cloudflare/workers-types": "npm:^5.20260719.1"
     "@eslint/compat": "npm:^2.1.0"
     "@eslint/eslintrc": "npm:^3.3.6"
     "@eslint/js": "npm:^10.0.1"