diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 48716deb..2a6a2350 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -14,7 +14,18 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v1
+    - name: Check out code from repo
+      uses: actions/checkout@v1
+    - name: Cache Python dependencies
+      uses: actions/cache@v1
+      with:
+        path: ~/.cache/pip
+        key: ${{ runner.os }}-pip-${{ hashFiles('platformio.ini') }}
+    - name: Cache PlatformIO dependencies
+      uses: actions/cache@v1
+      with:
+        path: ~/.pio/libdeps
+        key: ${{ runner.os }}-pio-${{ hashFiles('platformio.ini') }}
     - name: Set up Python 3.7
       uses: actions/setup-python@v1
       with: