diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index 679f3bd3..382d3d6f 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -55,7 +55,7 @@ jobs:
         # your codebase is analyzed, see https://docs.github.com/en/code-security/code-scanning/creating-an-advanced-setup-for-code-scanning/codeql-code-scanning-for-compiled-languages
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 0634ee39..777971b1 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -15,7 +15,7 @@ jobs:
     outputs:
       prepared: ${{ steps.validate.outputs.prepared }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Validate commit message
         id: validate
@@ -51,7 +51,7 @@ jobs:
         app-id: ${{ vars.PYPSA_BOT_ID }}
         private-key: ${{ secrets.PYPSA_BOT_PRIVATE_KEY }}
 
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
       with:
         fetch-depth: 0
 
@@ -61,7 +61,7 @@ jobs:
         echo "Branch found: $branch"
         echo "BRANCH_NAME=$branch" >> $GITHUB_ENV
 
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
       with:
         fetch-depth: 0
         ref: ${{ env.BRANCH_NAME }}
@@ -110,7 +110,7 @@ jobs:
     if: ${{ needs.check-preparation.outputs.prepared == 'true' }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: hynek/build-and-inspect-python-package@v2
         with:
           upload-name-suffix: "-release"
@@ -120,7 +120,7 @@ jobs:
     needs: [build]
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: softprops/action-gh-release@v2
         with:
           body: |
@@ -138,7 +138,7 @@ jobs:
     permissions:
       id-token: write
     steps:
-    - uses: actions/download-artifact@v4
+    - uses: actions/download-artifact@v5
       with:
         name: Packages-release
         path: dist
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 87562369..637f7489 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -20,7 +20,7 @@ jobs:
     name: Build and verify package
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           fetch-depth: 0 # Needed for setuptools_scm
       - uses: hynek/build-and-inspect-python-package@v2
@@ -44,7 +44,7 @@ jobs:
         - windows-latest
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
       with:
         fetch-depth: 0 # Needed for setuptools_scm
 
@@ -54,13 +54,13 @@ jobs:
         python-version: ${{ matrix.python-version }}
 
     - name: Set up Java
-      uses: actions/setup-java@v4
+      uses: actions/setup-java@v5
       with:
         distribution: 'temurin'
         java-version: 22
 
     - name: Download package
-      uses: actions/download-artifact@v4
+      uses: actions/download-artifact@v5
       with:
         name: Packages
         path: dist
diff --git a/.github/workflows/type-checking.yml b/.github/workflows/type-checking.yml
index 111aadd5..e7efd21b 100644
--- a/.github/workflows/type-checking.yml
+++ b/.github/workflows/type-checking.yml
@@ -10,7 +10,7 @@ jobs:
   mypy:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
       with:
         fetch-depth: 0