diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index 8c748841..27e7cf84 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@v4
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL
diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
index abadfd6f..3d10ce17 100644
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -19,7 +19,7 @@ jobs:
         std: ["11", "14", "17", "20"]
         unitBase: ["uint64_t", "uint32_t"]
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/static-analyzers.yml b/.github/workflows/static-analyzers.yml
index ff03c9c6..84fc8a11 100644
--- a/.github/workflows/static-analyzers.yml
+++ b/.github/workflows/static-analyzers.yml
@@ -14,7 +14,7 @@ jobs:
     container: helics/buildenv:cpplint
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Run cpplint
       run: cpplint --counting=detailed --recursive units test webserver converter  
   cppcheck:
@@ -22,6 +22,6 @@ jobs:
     container: helics/buildenv:cppcheck2
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Run cppcheck
       run: cppcheck --enable=performance,portability,unusedFunction --suppressions-list=config/cppcheck_suppressions.txt --error-exitcode=-4 -i ThirdParty -i FuzzTargets -i docs -i config .
\ No newline at end of file
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 3c12a4ed..8c4088b5 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -13,7 +13,7 @@ jobs:
     name: CMake config check 3.4-3.11
     runs-on: ubuntu-20.04
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: update certificates
       run: |
@@ -70,7 +70,7 @@ jobs:
     name: CMake config check 3.12+
     runs-on: ubuntu-22.04
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Check CMake 3.12
       uses: ./.github/actions/quick_cmake