diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index 14dffa9..4d63845 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -38,7 +38,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v3
+      uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL
diff --git a/.github/workflows/test-action.yml b/.github/workflows/test-action.yml
index b276d64..a0e440b 100644
--- a/.github/workflows/test-action.yml
+++ b/.github/workflows/test-action.yml
@@ -11,14 +11,14 @@ jobs:
         elixir: ['1.11.4', '1.12', '1.13']
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - uses: erlef/setup-beam@v1
         with:
           elixir-version: ${{ matrix.elixir }}
           otp-version: ${{ matrix.otp }}
 
       - name: Retrieve Mix Dependencies Cache
-        uses: actions/cache@v1
+        uses: actions/cache@cdf6c1fa76f9f475f3d7449005a359c84ca0f306 # v5.0.3
         id: mix-cache
         with:
           path: deps
@@ -34,7 +34,7 @@ jobs:
         run: MIX_ENV=test mix compile --warnings-as-errors
 
       - name: Retrieve PLT Cache
-        uses: actions/cache@v1
+        uses: actions/cache@cdf6c1fa76f9f475f3d7449005a359c84ca0f306 # v5.0.3
         id: plt-cache
         with:
           path: priv/plts