diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 90b78a6..a553897 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,6 +15,12 @@ jobs:
       - uses: earthly/actions-setup@v1
         with:
           version: v0.7.8
+      - name: Set up QEMU
+        id: qemu
+        uses: docker/setup-qemu-action@v1
+        with:
+          image: tonistiigi/binfmt:latest
+          platforms: all
       - uses: actions/checkout@v2
       - name: Put back the git branch into git (Earthly uses it for tagging)
         run: |
diff --git a/Earthfile b/Earthfile
index e363f57..651727a 100644
--- a/Earthfile
+++ b/Earthfile
@@ -3,7 +3,7 @@ FROM crystallang/crystal:latest
 WORKDIR /workdir
 
 all:
-    BUILD +test
+    BUILD --platform=linux/amd64--platform=linux/arm64 +test
 
 deps:
     RUN apt-get update \