diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e7a5e686c..d5138f9a0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -24,7 +24,7 @@ jobs:
           - 15-led-compass
           - 16-punch-o-meter
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: actions-rs/toolchain@v1
         with:
           profile: minimal
@@ -41,7 +41,7 @@ jobs:
   build-f3discovery-doc:
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: actions-rs/toolchain@v1
         with:
           profile: minimal
@@ -63,7 +63,7 @@ jobs:
           - 09-led-compass
           - 10-punch-o-meter
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: actions-rs/toolchain@v1
         with:
           profile: minimal
@@ -81,7 +81,7 @@ jobs:
   build-microbit-doc:
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: actions-rs/toolchain@v1
         with:
           profile: minimal
@@ -99,7 +99,7 @@ jobs:
   build-book:
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: actions-rs/toolchain@v1
         with:
           profile: minimal
@@ -114,11 +114,13 @@ jobs:
         run: echo "~/.local/bin" >> $GITHUB_PATH
 
       - name: Cache Cargo installed binaries
-        uses: actions/cache@v1
+        uses: actions/cache@v4
         id: cache-cargo
         with:
           path: ~/cargo-bin
-          key: cache-cargo
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-
       - name: Install mdbook
         if: steps.cache-cargo.outputs.cache-hit != 'true'
         uses: actions-rs/install@v0.1