diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index acd0250..cdae2ea 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -16,7 +16,7 @@ jobs:
       version: ${{ steps.version.outputs.version }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
 
       - name: Extract version from tag
         id: version
@@ -82,7 +82,7 @@ jobs:
             @iconParam
 
       - name: Upload EXE artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
         with:
           name: windows-installer
           path: build/ClaudeCodeInstaller.exe
@@ -92,7 +92,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
 
       - name: Embed SKILL.md into installer and package as .command
         run: |
@@ -127,7 +127,7 @@ jobs:
         # .command extension lets macOS users double-click to run in Terminal
 
       - name: Upload .command artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
         with:
           name: mac-installer
           path: build/Install-ClaudeCode-mac.zip
@@ -138,19 +138,19 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Download Windows artifact
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093 # v4
         with:
           name: windows-installer
           path: artifacts
 
       - name: Download Mac artifact
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093 # v4
         with:
           name: mac-installer
           path: artifacts
 
       - name: Create GitHub Release
-        uses: softprops/action-gh-release@v2
+        uses: softprops/action-gh-release@3bb12739c298aeb8a4eeaf626c5b8d85266b0e65 # v2
         with:
           name: "Claude Code Installer ${{ github.ref_name }}"
           body: |