diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 78bad0e36d..649a90a3ac 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -111,7 +111,7 @@ jobs:
 
       - name: Restore rewatch build cache
         id: rewatch-build-cache
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: rewatch/target
           key: rewatch-build-v3-${{ matrix.rust-target }}-${{ hashFiles('rewatch/src/**', 'rewatch/Cargo.lock') }}
@@ -165,7 +165,7 @@ jobs:
 
       - name: Restore OPAM environment
         id: cache-opam-env
-        uses: actions/cache/restore@v5
+        uses: actions/cache/restore@v6
         with:
           path: |
             ${{ runner.tool_cache }}/opam
@@ -201,7 +201,7 @@ jobs:
 
       - name: Cache OPAM environment
         if: steps.cache-opam-env.outputs.cache-hit != 'true'
-        uses: actions/cache/save@v5
+        uses: actions/cache/save@v6
         with:
           path: |
             ${{ runner.tool_cache }}/opam
@@ -259,7 +259,7 @@ jobs:
       - name: Restore compiler build state
         if: github.base_ref == 'master' || github.ref == 'refs/heads/master'
         id: compiler-build-state
-        uses: actions/cache/restore@v5
+        uses: actions/cache/restore@v6
         with:
           path: |
             C:\.cache\dune
@@ -284,7 +284,7 @@ jobs:
 
       - name: Save compiler build state
         if: github.event_name == 'push' && github.ref == 'refs/heads/master'
-        uses: actions/cache/save@v5
+        uses: actions/cache/save@v6
         with:
           path: |
             C:\.cache\dune
@@ -348,7 +348,7 @@ jobs:
       #
       # - name: Restore previous benchmark data
       #   if: matrix.benchmarks
-      #   uses: actions/cache/restore@v5
+      #   uses: actions/cache/restore@v6
       #   with:
       #     path: ./tests/benchmark-cache
       #     key: syntax-benchmark-v1
@@ -369,7 +369,7 @@ jobs:
 
       # - name: Save benchmark data as new baseline
       #   if: matrix.benchmarks && github.ref == 'refs/heads/master'
-      #   uses: actions/cache/save@v5
+      #   uses: actions/cache/save@v6
       #   with:
       #     path: ./tests/benchmark-cache
       #     key: syntax-benchmark-v1
diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
index d1966af776..fb92400d7f 100644
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -51,7 +51,7 @@ jobs:
       # and the cargo build when the rewatch sources haven't changed.
       - name: Restore rewatch build cache
         id: rewatch-build-cache
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: rewatch/target
           key: rewatch-build-v3-${{ env.RUST_TARGET }}-${{ hashFiles('rewatch/src/**', 'rewatch/Cargo.lock') }}
@@ -89,7 +89,7 @@ jobs:
 
       - name: Restore OPAM environment
         id: cache-opam-env
-        uses: actions/cache/restore@v5
+        uses: actions/cache/restore@v6
         with:
           path: |
             ${{ runner.tool_cache }}/opam
@@ -127,7 +127,7 @@ jobs:
       # still get full restore from the latest master-saved cache.
       - name: Save OPAM environment
         if: steps.cache-opam-env.outputs.cache-hit != 'true' && github.event_name == 'push' && github.ref == 'refs/heads/master'
-        uses: actions/cache/save@v5
+        uses: actions/cache/save@v6
         with:
           path: |
             ${{ runner.tool_cache }}/opam
@@ -168,7 +168,7 @@ jobs:
       - name: Restore coverage build state
         if: github.base_ref == 'master' || github.ref == 'refs/heads/master'
         id: coverage-build-state
-        uses: actions/cache/restore@v5
+        uses: actions/cache/restore@v6
         with:
           path: |
             ~/.cache/dune
@@ -191,7 +191,7 @@ jobs:
 
       - name: Save coverage build state
         if: github.event_name == 'push' && github.ref == 'refs/heads/master'
-        uses: actions/cache/save@v5
+        uses: actions/cache/save@v6
         with:
           path: |
             ~/.cache/dune