diff --git a/docker/checkstyle-7.7.jar b/docker/checkstyle-7.7.jar
new file mode 100644
index 00000000..d1d6ab02
Binary files /dev/null and b/docker/checkstyle-7.7.jar differ
diff --git a/docker/checkstyle.Dockerfile b/docker/checkstyle.Dockerfile
index eb6e5dc6..69f56b8c 100644
--- a/docker/checkstyle.Dockerfile
+++ b/docker/checkstyle.Dockerfile
@@ -1,18 +1,15 @@
 FROM alpine:3.7
 
-ENV CHECKSTYLE_URL https://downloads.sourceforge.net/project/checkstyle/checkstyle/7.7/checkstyle-7.7-all.jar
-
 RUN mkdir /tool && mkdir /src
+COPY checkstyle-7.7.jar /tool/checkstyle.jar
 
 RUN apk update \
-  && apk add curl openjdk8-jre \
-  # Get checkstyle and make wrapper script
-  && curl -fsSL "$CHECKSTYLE_URL" -o /tool/checkstyle.jar \
+  && apk add openjdk8-jre \
+  # Make wrapper script for checkstyle
   && echo '#!/bin/sh' >> /usr/bin/checkstyle \
   && echo 'java -jar /tool/checkstyle.jar $@' >> /usr/bin/checkstyle \
   && chmod +x /usr/bin/checkstyle \
   # Cleanup
-  && apk del curl \
   && rm -rf /var/cache/apk/*
 
 WORKDIR /src