diff --git a/dist/index.js b/dist/index.js
index 337da6a..6d94573 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -3359,7 +3359,7 @@ class HttpClient {
         }
         const usingSsl = parsedUrl.protocol === 'https:';
         proxyAgent = new undici_1.ProxyAgent(Object.assign({ uri: proxyUrl.href, pipelining: !this._keepAlive ? 0 : 1 }, ((proxyUrl.username || proxyUrl.password) && {
-            token: `${proxyUrl.username}:${proxyUrl.password}`
+            token: `Basic ${Buffer.from(`${proxyUrl.username}:${proxyUrl.password}`).toString('base64')}`
         })));
         this._proxyAgentDispatcher = proxyAgent;
         if (usingSsl && this._ignoreSslError) {
diff --git a/package-lock.json b/package-lock.json
index 4af6fb1..6ee74be 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,7 +9,7 @@
       "license": "MIT",
       "dependencies": {
         "@actions/core": "^1.10.1",
-        "@actions/http-client": "^2.2.2",
+        "@actions/http-client": "^2.2.3",
         "@actions/tool-cache": "^2.0.1",
         "semver": "^7.6.3"
       },
@@ -53,9 +53,9 @@
       }
     },
     "node_modules/@actions/http-client": {
-      "version": "2.2.2",
-      "resolved": "https://registry.npmjs.org/@actions/http-client/-/http-client-2.2.2.tgz",
-      "integrity": "sha512-2TvX5LskKQzDDQI+bobIDGAjkn0NJiQlg4MTrKnZ8HfQ7nDEUbtJ1ytxPDb2bfk3Hr2XD99X8oAJISAmIoiSAQ==",
+      "version": "2.2.3",
+      "resolved": "https://registry.npmjs.org/@actions/http-client/-/http-client-2.2.3.tgz",
+      "integrity": "sha512-mx8hyJi/hjFvbPokCg4uRd4ZX78t+YyRPtnKWwIl+RzNaVuFpQHfmlGVfsKEJN8LwTCvL+DfVgAM04XaHkm6bA==",
       "dependencies": {
         "tunnel": "^0.0.6",
         "undici": "^5.25.4"
@@ -5860,9 +5860,9 @@
       }
     },
     "@actions/http-client": {
-      "version": "2.2.2",
-      "resolved": "https://registry.npmjs.org/@actions/http-client/-/http-client-2.2.2.tgz",
-      "integrity": "sha512-2TvX5LskKQzDDQI+bobIDGAjkn0NJiQlg4MTrKnZ8HfQ7nDEUbtJ1ytxPDb2bfk3Hr2XD99X8oAJISAmIoiSAQ==",
+      "version": "2.2.3",
+      "resolved": "https://registry.npmjs.org/@actions/http-client/-/http-client-2.2.3.tgz",
+      "integrity": "sha512-mx8hyJi/hjFvbPokCg4uRd4ZX78t+YyRPtnKWwIl+RzNaVuFpQHfmlGVfsKEJN8LwTCvL+DfVgAM04XaHkm6bA==",
       "requires": {
         "tunnel": "^0.0.6",
         "undici": "^5.25.4"
diff --git a/package.json b/package.json
index 2caf240..f603efd 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
   "license": "MIT",
   "dependencies": {
     "@actions/core": "^1.10.1",
-    "@actions/http-client": "^2.2.2",
+    "@actions/http-client": "^2.2.3",
     "@actions/tool-cache": "^2.0.1",
     "semver": "^7.6.3"
   },