diff --git a/.github/workflows/build_wheels.yml b/.github/workflows/build_wheels.yml
index 3218877..60556f6 100644
--- a/.github/workflows/build_wheels.yml
+++ b/.github/workflows/build_wheels.yml
@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-22.04
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Build wheels
         uses: pypa/cibuildwheel@v2.14.1
@@ -25,7 +25,7 @@ jobs:
     runs-on: macos-12
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Build wheels
         uses: pypa/cibuildwheel@v2.14.1
@@ -42,7 +42,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 60
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-python@v4
         with:
           python-version: '3.x'
diff --git a/.github/workflows/test-linux-build.yml b/.github/workflows/test-linux-build.yml
index 44e9844..9e96eac 100644
--- a/.github/workflows/test-linux-build.yml
+++ b/.github/workflows/test-linux-build.yml
@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 60
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-python@v4
         with:
           python-version: '3.x'
diff --git a/.github/workflows/test-linux-cxx-only.yml b/.github/workflows/test-linux-cxx-only.yml
index 562f520..b6b6b63 100644
--- a/.github/workflows/test-linux-cxx-only.yml
+++ b/.github/workflows/test-linux-cxx-only.yml
@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 60
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-python@v4
         with:
           python-version: '3.x'
diff --git a/.github/workflows/test-linux-dependencies.yml b/.github/workflows/test-linux-dependencies.yml
index 311fb26..e7192eb 100644
--- a/.github/workflows/test-linux-dependencies.yml
+++ b/.github/workflows/test-linux-dependencies.yml
@@ -28,7 +28,7 @@ jobs:
 
       - name: checkout libcasm-global
         if: steps.cache-libcasm-global-restore.outputs.cache-hit != 'true'
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: prisms-center/CASMcode_global
           path: CASMcode_global
@@ -62,7 +62,7 @@ jobs:
 
       - name: checkout libcasm-composition
         if: steps.cache-libcasm-composition-restore.outputs.cache-hit != 'true'
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: prisms-center/CASMcode_composition
           path: CASMcode_composition
@@ -95,7 +95,7 @@ jobs:
 
       - name: checkout libcasm-xtal
         if: steps.cache-libcasm-xtal-restore.outputs.cache-hit != 'true'
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: prisms-center/CASMcode_crystallography
           path: CASMcode_crystallography
diff --git a/.github/workflows/test-linux-pip-install-dependencies.yml b/.github/workflows/test-linux-pip-install-dependencies.yml
index ff01da8..b39bc89 100644
--- a/.github/workflows/test-linux-pip-install-dependencies.yml
+++ b/.github/workflows/test-linux-pip-install-dependencies.yml
@@ -19,7 +19,7 @@ jobs:
 
       ### libcasm-global ###
       - name: checkout libcasm-global tests
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: prisms-center/CASMcode_global
           path: CASMcode_global
@@ -35,7 +35,7 @@ jobs:
 
       ### libcasm-composition ###
       - name: checkout libcasm-composition tests
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: prisms-center/CASMcode_composition
           path: CASMcode_composition
@@ -52,7 +52,7 @@ jobs:
 
       ### libcasm-xtal ###
       - name: checkout libcasm-xtal tests
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: prisms-center/CASMcode_crystallography
           path: CASMcode_crystallography
diff --git a/.github/workflows/test-linux.yml b/.github/workflows/test-linux.yml
index 9e08a53..75a7145 100644
--- a/.github/workflows/test-linux.yml
+++ b/.github/workflows/test-linux.yml
@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 60
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-python@v4
         with:
           python-version: '3.x'
diff --git a/.github/workflows/test-macos-build.yml b/.github/workflows/test-macos-build.yml
index df9446d..c53ab8f 100644
--- a/.github/workflows/test-macos-build.yml
+++ b/.github/workflows/test-macos-build.yml
@@ -7,7 +7,7 @@ jobs:
     runs-on: macOS-latest
     timeout-minutes: 60
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-python@v4
         with:
           python-version: '3.x'
diff --git a/.github/workflows/test-macos.yml b/.github/workflows/test-macos.yml
index a75bbd0..a06b17e 100644
--- a/.github/workflows/test-macos.yml
+++ b/.github/workflows/test-macos.yml
@@ -7,7 +7,7 @@ jobs:
     runs-on: macOS-latest
     timeout-minutes: 60
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-python@v4
         with:
           python-version: '3.x'