diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index a6816b0..48d85d3 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -33,7 +33,7 @@ jobs:
           echo "CPPFLAGS=-I/opt/homebrew/include" >> "$GITHUB_ENV"
           echo "LDFLAGS=-L/opt/homebrew/lib" >> "$GITHUB_ENV"
       - name: checkout APF source code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: run unit tests
         run: |
           make -C unit_tests
diff --git a/.github/workflows/pd-externals.yml b/.github/workflows/pd-externals.yml
index 6ed9246..cef8ddb 100644
--- a/.github/workflows/pd-externals.yml
+++ b/.github/workflows/pd-externals.yml
@@ -8,7 +8,7 @@ jobs:
         run: |
           sudo apt-get install --no-install-recommends puredata-dev
       - name: checkout APF
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: true
           path: apf
@@ -31,7 +31,7 @@ jobs:
         run: |
           brew install --cask pd
       - name: checkout APF
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: true
           path: apf
@@ -70,7 +70,7 @@ jobs:
           rm -f Pd.zip
           export PD="${PROGRAMFILES}/pd/bin/pd.com"
       - name: checkout APF
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: true
           path: apf
@@ -94,7 +94,7 @@ jobs:
           apt-get update
           apt-get install --assume-yes --no-install-recommends git
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           # check out all tags to get proper version in Deken package
           fetch-depth: 0