diff --git a/docker/alpine.Dockerfile b/docker/alpine.Dockerfile
index a744d1f..84e0f1d 100644
--- a/docker/alpine.Dockerfile
+++ b/docker/alpine.Dockerfile
@@ -21,6 +21,9 @@ RUN \
     --exclude */share/crystal/src/llvm/ext/llvm_ext.o && \
   rm /tmp/crystal.tar.gz
 
+# Smoke test
+RUN crystal eval 'puts "Hello World"' | grep -q "Hello World" && shards --version
+
 CMD ["/bin/sh"]
 
 FROM runtime AS build
diff --git a/docker/ubuntu.Dockerfile b/docker/ubuntu.Dockerfile
index c03681e..2bb6cde 100644
--- a/docker/ubuntu.Dockerfile
+++ b/docker/ubuntu.Dockerfile
@@ -18,6 +18,9 @@ RUN \
   tar -xz -C /usr --strip-component=1 -f /tmp/crystal.tar.gz && \
   rm /tmp/crystal.tar.gz
 
+# Smoke test
+RUN crystal eval 'puts "Hello World"' | grep --quiet "Hello World" && shards --version
+
 CMD ["/bin/sh"]
 
 FROM runtime AS build