diff --git a/.github/workflows/cd.yml b/.github/workflows/cd.yml
index 01617d4..90d2daa 100644
--- a/.github/workflows/cd.yml
+++ b/.github/workflows/cd.yml
@@ -23,7 +23,7 @@ jobs:
     name: Make SDist
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v6.0.0
         with:
           fetch-depth: 0
 
@@ -65,7 +65,7 @@ jobs:
             cibw_skip: "pp* *musllinux* cp314*"
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v6.0.0
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/conda-build.yml b/.github/workflows/conda-build.yml
index d161ca2..d654e59 100644
--- a/.github/workflows/conda-build.yml
+++ b/.github/workflows/conda-build.yml
@@ -53,7 +53,7 @@ jobs:
     steps:
 
     - name: Checkout code
-      uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v4.1.4
+      uses: actions/checkout@c2d88d3ecc89a9ef08eebf45d9637801dcee7eb5 # v4.1.4
       with:
         fetch-depth: 0
 
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index f6e71ed..5b19896 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     name: flake8-black
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v6.0.0
     - name: Set up Python environment
       uses: actions/setup-python@v6
       with: