diff --git a/packages/netlify-cms-proxy-server/package.json b/packages/netlify-cms-proxy-server/package.json
index 76f438fc..c703739b 100644
--- a/packages/netlify-cms-proxy-server/package.json
+++ b/packages/netlify-cms-proxy-server/package.json
@@ -23,7 +23,7 @@
   },
   "dependencies": {
     "@hapi/joi": "^17.0.2",
-    "async-mutex": "^0.2.4",
+    "async-mutex": "^0.3.0",
     "cors": "^2.8.5",
     "dotenv": "^8.2.0",
     "express": "^4.17.1",
diff --git a/yarn.lock b/yarn.lock
index 332f61cd..8928bc40 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4442,12 +4442,12 @@ async-limiter@~1.0.0:
   resolved "https://registry.yarnpkg.com/async-limiter/-/async-limiter-1.0.1.tgz#dd379e94f0db8310b08291f9d64c3209766617fd"
   integrity sha512-csOlWGAcRFJaI6m+F2WKdnMKr4HhdhFVBk0H/QbJFMCr+uO2kwohwXQPxw/9OCxp05r5ghVBFSyioixx3gfkNQ==
 
-async-mutex@^0.2.4:
-  version "0.2.6"
-  resolved "https://registry.yarnpkg.com/async-mutex/-/async-mutex-0.2.6.tgz#0d7a3deb978bc2b984d5908a2038e1ae2e54ff40"
-  integrity sha512-Hs4R+4SPgamu6rSGW8C7cV9gaWUKEHykfzCCvIRuaVv636Ju10ZdeUbvb4TBEW0INuq2DHZqXbK4Nd3yG4RaRw==
+async-mutex@^0.3.0:
+  version "0.3.0"
+  resolved "https://registry.yarnpkg.com/async-mutex/-/async-mutex-0.3.0.tgz#5bc765c271dfc05c48040c12032a92f1dbef2dc3"
+  integrity sha512-6VIpUM7s37EMXvnO3TvujgaS6gx4yJby13BhxovMYSap7nrbS0gJ1UzGcjD+HElNSdTz/+IlAIqj7H48N0ZlyQ==
   dependencies:
-    tslib "^2.0.0"
+    tslib "^2.1.0"
 
 async@^2.6.2:
   version "2.6.3"
@@ -17617,7 +17617,7 @@ tslib@^1.10.0, tslib@^1.8.1, tslib@^1.9.0, tslib@^1.9.3:
   resolved "https://registry.yarnpkg.com/tslib/-/tslib-1.14.1.tgz#cf2d38bdc34a134bcaf1091c41f6619e2f672d00"
   integrity sha512-Xni35NKzjgMrwevysHTCArtLDpPvye8zV/0E4EyYn43P7/7qvQwPh9BGkHewbMulVntbigmcT7rdX3BNo9wRJg==
 
-tslib@^2.0.0, tslib@^2.0.1, tslib@^2.0.3:
+tslib@^2.0.1, tslib@^2.0.3, tslib@^2.1.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/tslib/-/tslib-2.1.0.tgz#da60860f1c2ecaa5703ab7d39bc05b6bf988b97a"
   integrity sha512-hcVC3wYEziELGGmEEXue7D75zbwIIVUMWAVbHItGPx0ziyXxrOMQx4rQEVEV45Ut/1IotuEvwqPopzIOkDMf0A==