diff --git a/.github/workflows/audit.yml b/.github/workflows/audit.yml
index a8f5be4a..6633406b 100644
--- a/.github/workflows/audit.yml
+++ b/.github/workflows/audit.yml
@@ -32,7 +32,7 @@ jobs:
       run: npm run bootstrap
 
     - name: audit tools (without allow-list)
-      run: npm audit --audit-level=moderate
+      run: npm audit --audit-level=moderate --omit dev
 
     - name: audit packages
       run: npm run audit-all
diff --git a/packages/attest/RELEASES.md b/packages/attest/RELEASES.md
index 9b68907f..4e85ca38 100644
--- a/packages/attest/RELEASES.md
+++ b/packages/attest/RELEASES.md
@@ -1,36 +1,40 @@
 # @actions/attest Releases
 
+### 1.4.1
+
+- Bump @actions/http-client from 2.2.1 to 2.2.3 [#1805](https://github.com/actions/toolkit/pull/1805)
+
 ### 1.4.0
 
-- Add new `headers` parameter to the `attest` and `attestProvenance` functions.
-- Update `buildSLSAProvenancePredicate`/`attestProvenance` to automatically derive default OIDC issuer URL from current execution context.
+- Add new `headers` parameter to the `attest` and `attestProvenance` functions [#1790](https://github.com/actions/toolkit/pull/1790)
+- Update `buildSLSAProvenancePredicate`/`attestProvenance` to automatically derive default OIDC issuer URL from current execution context [#1796](https://github.com/actions/toolkit/pull/1796)
 
 ### 1.3.1
 
-- Fix bug with proxy support when retrieving JWKS for OIDC issuer
+- Fix bug with proxy support when retrieving JWKS for OIDC issuer [#1776](https://github.com/actions/toolkit/pull/1776)
 
 ### 1.3.0
 
-- Dynamic construction of Sigstore API URLs
-- Switch to new GH provenance build type
-- Fetch existing Rekor entry on 409 conflict error
-- Bump @sigstore/bundle from 2.3.0 to 2.3.2
-- Bump @sigstore/sign from 2.3.0 to 2.3.2
+- Dynamic construction of Sigstore API URLs [#1735](https://github.com/actions/toolkit/pull/1735)
+- Switch to new GH provenance build type [#1745](https://github.com/actions/toolkit/pull/1745)
+- Fetch existing Rekor entry on 409 conflict error [#1759](https://github.com/actions/toolkit/pull/1759)
+- Bump @sigstore/bundle from 2.3.0 to 2.3.2 [#1738](https://github.com/actions/toolkit/pull/1738)
+- Bump @sigstore/sign from 2.3.0 to 2.3.2 [#1738](https://github.com/actions/toolkit/pull/1738)
 
 ### 1.2.1
 
-- Retry request on attestation persistence failure
+- Retry request on attestation persistence failure [#1725](https://github.com/actions/toolkit/pull/1725)
 
 ### 1.2.0
 
-- Generate attestations using the v0.3 Sigstore bundle format.
-- Bump @sigstore/bundle from 2.2.0 to 2.3.0.
-- Bump @sigstore/sign from 2.2.3 to 2.3.0.
-- Remove dependency on make-fetch-happen
+- Generate attestations using the v0.3 Sigstore bundle format [#1701](https://github.com/actions/toolkit/pull/1701)
+- Bump @sigstore/bundle from 2.2.0 to 2.3.0 [#1701](https://github.com/actions/toolkit/pull/1701)
+- Bump @sigstore/sign from 2.2.3 to 2.3.0 [#1701](https://github.com/actions/toolkit/pull/1701)
+- Remove dependency on make-fetch-happen [#1714](https://github.com/actions/toolkit/pull/1714)
 
 ### 1.1.0
 
-- Updates the `attestProvenance` function to retrieve a token from the GitHub OIDC provider and use the token claims to populate the provenance statement.
+- Updates the `attestProvenance` function to retrieve a token from the GitHub OIDC provider and use the token claims to populate the provenance statement [#1693](https://github.com/actions/toolkit/pull/1693)
 
 ### 1.0.0
 
diff --git a/packages/attest/package-lock.json b/packages/attest/package-lock.json
index e7fafa40..17b72849 100644
--- a/packages/attest/package-lock.json
+++ b/packages/attest/package-lock.json
@@ -1,17 +1,17 @@
 {
   "name": "@actions/attest",
-  "version": "1.4.0",
+  "version": "1.4.1",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "@actions/attest",
-      "version": "1.4.0",
+      "version": "1.4.1",
       "license": "MIT",
       "dependencies": {
         "@actions/core": "^1.10.1",
         "@actions/github": "^6.0.0",
-        "@actions/http-client": "^2.2.1",
+        "@actions/http-client": "^2.2.3",
         "@octokit/plugin-retry": "^6.0.1",
         "@sigstore/bundle": "^2.3.2",
         "@sigstore/sign": "^2.3.2",
@@ -46,9 +46,9 @@
       }
     },
     "node_modules/@actions/http-client": {
-      "version": "2.2.1",
-      "resolved": "https://registry.npmjs.org/@actions/http-client/-/http-client-2.2.1.tgz",
-      "integrity": "sha512-KhC/cZsq7f8I4LfZSJKgCvEwfkE8o1538VoBeoGzokVLLnbFDEAdFD3UhoMklxo2un9NJVBdANOresx7vTHlHw==",
+      "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"
@@ -1767,9 +1767,9 @@
       }
     },
     "@actions/http-client": {
-      "version": "2.2.1",
-      "resolved": "https://registry.npmjs.org/@actions/http-client/-/http-client-2.2.1.tgz",
-      "integrity": "sha512-KhC/cZsq7f8I4LfZSJKgCvEwfkE8o1538VoBeoGzokVLLnbFDEAdFD3UhoMklxo2un9NJVBdANOresx7vTHlHw==",
+      "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/packages/attest/package.json b/packages/attest/package.json
index d9c6b878..224e948a 100644
--- a/packages/attest/package.json
+++ b/packages/attest/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@actions/attest",
-  "version": "1.4.0",
+  "version": "1.4.1",
   "description": "Actions attestation lib",
   "keywords": [
     "github",
@@ -44,7 +44,7 @@
   "dependencies": {
     "@actions/core": "^1.10.1",
     "@actions/github": "^6.0.0",
-    "@actions/http-client": "^2.2.1",
+    "@actions/http-client": "^2.2.3",
     "@octokit/plugin-retry": "^6.0.1",
     "@sigstore/bundle": "^2.3.2",
     "@sigstore/sign": "^2.3.2",
diff --git a/packages/http-client/RELEASES.md b/packages/http-client/RELEASES.md
index 02a933b6..6d9ccf5d 100644
--- a/packages/http-client/RELEASES.md
+++ b/packages/http-client/RELEASES.md
@@ -1,5 +1,8 @@
 ## Releases
 
+## 2.2.3
+- Fixed an issue where proxy username and password were not handled correctly [#1799](https://github.com/actions/toolkit/pull/1799)
+
 ## 2.2.2
 - Better handling of url encoded usernames and passwords in proxy config [#1782](https://github.com/actions/toolkit/pull/1782)
 
diff --git a/packages/http-client/package-lock.json b/packages/http-client/package-lock.json
index e58eb440..823b38b7 100644
--- a/packages/http-client/package-lock.json
+++ b/packages/http-client/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "@actions/http-client",
-  "version": "2.2.2",
+  "version": "2.2.3",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
diff --git a/packages/http-client/package.json b/packages/http-client/package.json
index df29f961..3960a83a 100644
--- a/packages/http-client/package.json
+++ b/packages/http-client/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@actions/http-client",
-  "version": "2.2.2",
+  "version": "2.2.3",
   "description": "Actions Http Client",
   "keywords": [
     "github",
diff --git a/packages/http-client/src/index.ts b/packages/http-client/src/index.ts
index 6f575f7d..6ee9ae43 100644
--- a/packages/http-client/src/index.ts
+++ b/packages/http-client/src/index.ts
@@ -726,7 +726,9 @@ export class HttpClient {
       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