diff --git a/dist/index.js b/dist/index.js
index 6fdb532..a3e81b5 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -1873,7 +1873,9 @@ class HttpClient {
                 maxSockets: maxSockets,
                 keepAlive: this._keepAlive,
                 proxy: {
-                    proxyAuth: `${proxyUrl.username}:${proxyUrl.password}`,
+                    ...((proxyUrl.username || proxyUrl.password) && {
+                        proxyAuth: `${proxyUrl.username}:${proxyUrl.password}`
+                    }),
                     host: proxyUrl.hostname,
                     port: proxyUrl.port
                 }
diff --git a/package-lock.json b/package-lock.json
index 1f5257f..b1845bb 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -18,9 +18,9 @@
       }
     },
     "@actions/http-client": {
-      "version": "1.0.9",
-      "resolved": "https://registry.npmjs.org/@actions/http-client/-/http-client-1.0.9.tgz",
-      "integrity": "sha512-0O4SsJ7q+MK0ycvXPl2e6bMXV7dxAXOGjrXS1eTF9s2S401Tp6c/P3c3Joz04QefC1J6Gt942Wl2jbm3f4mLcg==",
+      "version": "1.0.11",
+      "resolved": "https://registry.npmjs.org/@actions/http-client/-/http-client-1.0.11.tgz",
+      "integrity": "sha512-VRYHGQV1rqnROJqdMvGUbY/Kn8vriQe/F9HR2AlYHzmKuM/p3kjNuXhmdBfcVgsvRWTz5C5XW5xvndZrVBuAYg==",
       "requires": {
         "tunnel": "0.0.6"
       }
diff --git a/package.json b/package.json
index bfa6c3c..5d06df6 100644
--- a/package.json
+++ b/package.json
@@ -24,7 +24,7 @@
   "license": "MIT",
   "dependencies": {
     "@actions/core": "^1.2.6",
-    "@actions/http-client": "^1.0.9",
+    "@actions/http-client": "^1.0.11",
     "@actions/tool-cache": "^1.6.1",
     "semver": "^7.3.5"
   },