diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index b6e18e3..85896f9 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -4,14 +4,37 @@
 
 jobs:
 
+  cache:
+    name: Cache
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Cache packages
+        uses: actions/cache@v3
+        with:
+          path: /var/cache/apt/archives/*.deb
+          key: apt-cache
+      - name: Download packages
+        run: |
+          sudo apt update
+          sudo apt install -y -d -o Acquire::Retries=50 \
+                           mtools syslinux isolinux \
+                           libc6-dev-i386 valgrind \
+                           gcc-arm-none-eabi gcc-aarch64-linux-gnu
+
   x86:
     name: x86
     runs-on: ubuntu-22.04
+    needs: cache
     steps:
       - name: Check out code
         uses: actions/checkout@v3
         with:
           fetch-depth: 0
+      - name: Cached packages
+        uses: actions/cache/restore@v3
+        with:
+          path: /var/cache/apt/archives/*.deb
+          key: apt-cache
       - name: Install packages
         run: |
           sudo dpkg --add-architecture i386
@@ -33,11 +56,17 @@
   arm32:
     name: ARM32
     runs-on: ubuntu-22.04
+    needs: cache
     steps:
       - name: Check out code
         uses: actions/checkout@v3
         with:
           fetch-depth: 0
+      - name: Cached packages
+        uses: actions/cache/restore@v3
+        with:
+          path: /var/cache/apt/archives/*.deb
+          key: apt-cache
       - name: Install packages
         run: |
           sudo apt update
@@ -53,11 +82,17 @@
   arm64:
     name: ARM64
     runs-on: ubuntu-22.04
+    needs: cache
     steps:
       - name: Check out code
         uses: actions/checkout@v3
         with:
           fetch-depth: 0
+      - name: Cached packages
+        uses: actions/cache/restore@v3
+        with:
+          path: /var/cache/apt/archives/*.deb
+          key: apt-cache
       - name: Install packages
         run: |
           sudo apt update