diff --git a/.github/workflows/haskell.yml b/.github/workflows/haskell.yml
index f7c7bbe..7bac79a 100644
--- a/.github/workflows/haskell.yml
+++ b/.github/workflows/haskell.yml
@@ -45,7 +45,7 @@ jobs:
         enable-stack: true
         stack-no-global: true
 
-    - uses: actions/cache/restore@v3
+    - uses: actions/cache/restore@v4
       name: Cache stack files
       with:
         path: ${{ steps.setuphaskell.outputs.stack-root }}
@@ -80,7 +80,7 @@ jobs:
         # https://github.com/commercialhaskell/stack/issues/5024#issuecomment-845001389
         stack build --resolver=${{ matrix.snapshot }} --ghc-options=-Werror --test --bench -j 1
 
-    - uses: actions/cache/save@v3
+    - uses: actions/cache/save@v4
       if: always()
       with:
         path: ${{ steps.setuphaskell.outputs.stack-root }}
diff --git a/.github/workflows/macOS.yml b/.github/workflows/macOS.yml
index d3d31cb..906ad5f 100644
--- a/.github/workflows/macOS.yml
+++ b/.github/workflows/macOS.yml
@@ -41,11 +41,11 @@ jobs:
     # between builds so we disable cache (that's the reason why we don't build
     # this along linux and windows, the builds is just too slow, and linux
     # covers most of the cases for a unix-y OS)
-    # - uses: actions/cache@main
-    #   name: Cache stack files
-    #   with:
-    #     path: ${{ steps.setuphaskell.outputs.stack-root }}
-    #     key: ${{ runner.os }}-${{ matrix.snapshot }}-stack2
+    - uses: actions/cache/restore@v4
+      name: Cache stack files
+      with:
+        path: ${{ steps.setuphaskell.outputs.stack-root }}
+        key: ${{ runner.os }}-${{ matrix.snapshot }}-stack2
 
     - name: Setup stack.yaml
       shell: bash
@@ -68,9 +68,16 @@ jobs:
         echo "stack_root: ${{ steps.setuphaskell.outputs.stack-root }}"
         stack --version
         stack --resolver=${{ matrix.snapshot }} ghc -- --version
+
         # we first build everything without running the tests (with unlimited parallelism)
         stack build --resolver=${{ matrix.snapshot }} --ghc-options=-Werror --test --bench --no-run-tests
 
         # once that's done we run the tests in a single threaded fashion to avoid
         # https://github.com/commercialhaskell/stack/issues/5024#issuecomment-845001389
         stack build --resolver=${{ matrix.snapshot }} --ghc-options=-Werror --test --bench -j 1
+
+    - uses: actions/cache/save@v4
+      if: always()
+      with:
+        path: ${{ steps.setuphaskell.outputs.stack-root }}
+        key: ${{ runner.os }}-${{ matrix.snapshot }}-stack2