diff --git a/.github/workflows/developer-flag.yml b/.github/workflows/developer-flag.yml
index 236e1eb3..3ad0f472 100644
--- a/.github/workflows/developer-flag.yml
+++ b/.github/workflows/developer-flag.yml
@@ -16,14 +16,14 @@ jobs:
         ghc: ['latest']
       fail-fast: false
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: haskell-actions/setup@v2
       id: setup-haskell-cabal
       with:
         ghc-version: ${{ matrix.ghc }}
     - name: Update cabal package database
       run: cabal update
-    - uses: actions/cache@v3
+    - uses: actions/cache@v4
       name: Cache cabal stuff
       with:
         path: ${{ steps.setup-haskell-cabal.outputs.cabal-store }}
diff --git a/.github/workflows/emulated.yml b/.github/workflows/emulated.yml
index aba143da..ff24a4c3 100644
--- a/.github/workflows/emulated.yml
+++ b/.github/workflows/emulated.yml
@@ -21,7 +21,7 @@ jobs:
       matrix:
         arch: ['s390x', 'ppc64le']
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: uraimo/run-on-arch-action@v2.5.0
       timeout-minutes: 60
       with:
diff --git a/.github/workflows/simdutf-flag-alpine.yml b/.github/workflows/simdutf-flag-alpine.yml
index b9c1174e..0f3c132a 100644
--- a/.github/workflows/simdutf-flag-alpine.yml
+++ b/.github/workflows/simdutf-flag-alpine.yml
@@ -32,7 +32,7 @@ jobs:
       - name: Update cabal package database
         run: cabal update
 
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Test
         run: |
           cat > THLinkTest.hs <<EOF
diff --git a/.github/workflows/simdutf-flag-windows.yml b/.github/workflows/simdutf-flag-windows.yml
index 86e88b31..b6d79f36 100644
--- a/.github/workflows/simdutf-flag-windows.yml
+++ b/.github/workflows/simdutf-flag-windows.yml
@@ -16,14 +16,14 @@ jobs:
         ghc: ['latest']
       fail-fast: false
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: haskell-actions/setup@v2
         id: setup-haskell-cabal
         with:
           ghc-version: ${{ matrix.ghc }}
       - name: Update cabal package database
         run: cabal update
-      - uses: actions/cache@v3
+      - uses: actions/cache@v4
         name: Cache cabal stuff
         with:
           path: ${{ steps.setup-haskell-cabal.outputs.cabal-store }}
diff --git a/.github/workflows/simdutf-flag.yml b/.github/workflows/simdutf-flag.yml
index 9a4599f5..9ba43547 100644
--- a/.github/workflows/simdutf-flag.yml
+++ b/.github/workflows/simdutf-flag.yml
@@ -16,14 +16,14 @@ jobs:
         ghc: ['latest']
       fail-fast: false
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: haskell-actions/setup@v2
       id: setup-haskell-cabal
       with:
         ghc-version: ${{ matrix.ghc }}
     - name: Update cabal package database
       run: cabal update
-    - uses: actions/cache@v2
+    - uses: actions/cache@v4
       name: Cache cabal stuff
       with:
         path: ${{ steps.setup-haskell-cabal.outputs.cabal-store }}
diff --git a/.github/workflows/windows_and_macOS.yml b/.github/workflows/windows_and_macOS.yml
index 36d4e0fa..e9391508 100644
--- a/.github/workflows/windows_and_macOS.yml
+++ b/.github/workflows/windows_and_macOS.yml
@@ -16,14 +16,14 @@ jobs:
         ghc: ['latest']
       fail-fast: false
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: haskell-actions/setup@v2
       id: setup-haskell-cabal
       with:
         ghc-version: ${{ matrix.ghc }}
     - name: Update cabal package database
       run: cabal update
-    - uses: actions/cache@v3
+    - uses: actions/cache@v4
       name: Cache cabal stuff
       with:
         path: ${{ steps.setup-haskell-cabal.outputs.cabal-store }}