diff --git a/.changeset/tidy-streams-rest.md b/.changeset/tidy-streams-rest.md
new file mode 100644
index 00000000..e1275db3
--- /dev/null
+++ b/.changeset/tidy-streams-rest.md
@@ -0,0 +1,5 @@
+---
+"partyserver": patch
+---
+
+Allow `@cloudflare/workers-types` v5 as a peer dependency. PartyServer remains compatible with v4 while projects using Wrangler 4.108 and newer can install the v5 runtime types without a peer dependency conflict.
diff --git a/package-lock.json b/package-lock.json
index 499e1488..48e095eb 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -11694,7 +11694,7 @@
         "ws": "^8.20.0"
       },
       "peerDependencies": {
-        "@cloudflare/workers-types": "^4.20260424.1"
+        "@cloudflare/workers-types": "^4.20260424.1 || ^5.20260703.1"
       }
     },
     "packages/partyserver/node_modules/nanoid": {
diff --git a/packages/partyserver/package.json b/packages/partyserver/package.json
index b40ce8ed..5ab9d768 100644
--- a/packages/partyserver/package.json
+++ b/packages/partyserver/package.json
@@ -43,7 +43,7 @@
     "nanoid": "^5.1.9"
   },
   "peerDependencies": {
-    "@cloudflare/workers-types": "^4.20260424.1"
+    "@cloudflare/workers-types": "^4.20260424.1 || ^5.20260703.1"
   },
   "devDependencies": {
     "@cloudflare/workers-types": "^4.20260426.1",