diff --git a/Dockerfile b/Dockerfile
index 485b830..072736a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -22,11 +22,16 @@ ENV FACTORIO_DISSALOW_COMMANDS true
 
 ENV FACOTIO_NO_AUTO_PAUSE false
 
+ENV VERSION=0.12.30
+ENV FACTORIO_SHA1="77d92ecc52989f3283462fd5c9b5ba07eb6081cc"
+
 RUN echo "# Installing curl" && \
     apt-get update && \
     apt-get install -y curl && \
     echo "# Downloading and unzipping factorio" && \
-    curl -L -k https://www.factorio.com/get-download/0.12.30/headless/linux64 | tar -xzf - && \
+    curl -L -k https://www.factorio.com/get-download/$VERSION/headless/linux64 -o /tmp/factorio_headless_x64_$VERSION.tar.gz && \
+    echo "$FACTORIO_SHA1 /tmp/factorio_headless_x64_$VERSION.tar.gz" | sha1sum -c - && \
+    tar xzf /tmp/factorio_headless_x64_$VERSION.tar.gz && \
     echo "# Cleaning" && \
     apt-get remove -y --purge curl  && \
     apt-get autoremove -y --purge && \