diff --git a/CHANGELOG.md b/CHANGELOG.md
index 95ad52d9..a69c4980 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 ## [Unreleased][unreleased]
 
 - Improve error handling in master thread
+- Server config `cors.origin` is now optional
 
 ## [2.6.8][] - 2022-03-19
 
diff --git a/schemas/config/server.js b/schemas/config/server.js
index 01411c14..e079e140 100644
--- a/schemas/config/server.js
+++ b/schemas/config/server.js
@@ -27,6 +27,6 @@
     timeout: 'number',
   },
   cors: {
-    origin: 'string',
+    origin: '?string',
   },
 });
diff --git a/types/config.d.ts b/types/config.d.ts
index a32f9e55..7220e119 100644
--- a/types/config.d.ts
+++ b/types/config.d.ts
@@ -42,7 +42,7 @@ export interface ServerConfig {
     wait: number;
     timeout: number;
   };
-  cors: {
+  cors?: {
     origin: string;
   };
 }