diff --git a/Dockerfile b/Dockerfile
index e65c397..11e2759 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -10,7 +10,7 @@ RUN ln -s /home/testssl/testssl.sh /usr/local/bin/
 USER testssl
 WORKDIR /home/testssl/
 
-COPY . ./
+RUN git clone --depth=1 https://github.com/drwetter/testssl.sh.git .
 
 ENTRYPOINT ["testssl.sh"]