diff --git a/package.json b/package.json
index 3879280..b56b9b1 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,8 @@
   "description": "",
   "main": "src/mockserver.js",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "postinstall": "node scripts/fix-mockserver-client.cjs"
   },
   "author": "",
   "license": "ISC",
diff --git a/scripts/fix-mockserver-client.cjs b/scripts/fix-mockserver-client.cjs
new file mode 100644
index 0000000..0457c0e
--- /dev/null
+++ b/scripts/fix-mockserver-client.cjs
@@ -0,0 +1,15 @@
+const fs = require('fs');
+
+const OLD = '/mock-server/mockserver/master/mockserver-core';
+const NEW = '/mock-server/mockserver-monorepo/master/mockserver/mockserver-core';
+
+const files = [
+  'node_modules/mockserver-client/webSocketClient.js',
+  'node_modules/mockserver-client/sendRequest.js',
+];
+
+files.forEach((f) => {
+  const content = fs.readFileSync(f, 'utf8');
+  fs.writeFileSync(f, content.replace(OLD, NEW));
+  console.log(`Fixed certificate URL in ${f}`);
+});