diff --git a/Dockerfile b/Dockerfile
index d09add34d..8f065d466 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -33,7 +33,7 @@ COPY setup.py setup.py
 
 # Perform build and cleanup artifacts
 RUN \
-  apk -U openssh git && \
+  apk add -U openssh git && \
   python setup.py install 2>/dev/null && \
   rm -rf /tmp/*