diff --git a/.github/workflows/ports_zephyr.yml b/.github/workflows/ports_zephyr.yml
index ff3e19c7ea13..eb85af6a3615 100644
--- a/.github/workflows/ports_zephyr.yml
+++ b/.github/workflows/ports_zephyr.yml
@@ -42,6 +42,10 @@ jobs:
         # cache the "workspace"
         path: ./zephyrproject
         key: zephyr-workspace-${{ steps.versions.outputs.ZEPHYR }}
+    - name: ccache
+      uses: hendrikmuhs/ccache-action@v1.2
+      with:
+        key: zephyr
     - name: Install packages
       run: source tools/ci.sh && ci_zephyr_setup
     - name: Install Zephyr
diff --git a/tools/ci.sh b/tools/ci.sh
index d4bfe4933690..c67aeed0cecd 100755
--- a/tools/ci.sh
+++ b/tools/ci.sh
@@ -754,12 +754,15 @@ function ci_zephyr_setup {
     # Directories cached by GitHub Actions, mounted
     # into the container
     ZEPHYRPROJECT_DIR="$(pwd)/zephyrproject"
+    CCACHE_DIR="$(pwd)/.ccache"
 
     mkdir -p "${ZEPHYRPROJECT_DIR}"
+    mkdir -p "${CCACHE_DIR}"
 
     docker run --name zephyr-ci -d -it \
       -v "$(pwd)":/micropython \
       -v "${ZEPHYRPROJECT_DIR}":/zephyrproject \
+      -v "${CCACHE_DIR}":/root/.cache/ccache \
       -e ZEPHYR_SDK_INSTALL_DIR=/opt/toolchains/zephyr-sdk-${ZEPHYR_SDK_VERSION} \
       -e ZEPHYR_TOOLCHAIN_VARIANT=zephyr \
       -e ZEPHYR_BASE=/zephyrproject/zephyr \