diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 151d1a2..1bf5a53 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -45,7 +45,7 @@ jobs:
           xcode-version: ${{ env.XCODE_VERSION }}
 
       - name: Cache SPM build artifacts
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: Packages/${{ matrix.package }}/.build
           key: spm-${{ runner.os }}-${{ matrix.package }}-${{ hashFiles(format('Packages/{0}/Package.swift', matrix.package)) }}
@@ -67,7 +67,7 @@ jobs:
           xcode-version: ${{ env.XCODE_VERSION }}
 
       - name: Cache SPM checkouts and DerivedData
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: |
             ~/Library/Developer/Xcode/DerivedData
diff --git a/.github/workflows/contract-tests.yml b/.github/workflows/contract-tests.yml
index 1ab3b78..3cf4f0c 100644
--- a/.github/workflows/contract-tests.yml
+++ b/.github/workflows/contract-tests.yml
@@ -44,7 +44,7 @@ jobs:
           xcode-version: ${{ env.XCODE_VERSION }}
 
       - name: Cache SPM build artifacts
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: Packages/InterlinedKit/.build
           key: spm-contract-${{ runner.os }}-${{ hashFiles('Packages/InterlinedKit/Package.swift') }}