diff --git a/Dockerfile b/Dockerfile
index d4a2cf8..4ff4b87 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -9,15 +9,20 @@ COPY ./factorio.crt /opt
 
 VOLUME /opt/factorio/saves /opt/factorio/mods
 
-ENV FACTORIO_AUTOSAVE_INTERVAL 2 \
-    FACTORIO_AUTOSAVE_SLOTS 3 \
-    FACTORIO_DISSALOW_COMMANDS true \
-    FACTORIO_NO_AUTO_PAUSE false \
-    VERSION=0.12.30 
+ENV FACTORIO_AUTOSAVE_INTERVAL=2 \
+    FACTORIO_AUTOSAVE_SLOTS=3 \
+    FACTORIO_DISSALOW_COMMANDS=true \
+    FACTORIO_NO_AUTO_PAUSE=false \
+    VERSION=0.12.30 \
+    FACTORIO_SHA1=77d92ecc52989f3283462fd5c9b5ba07eb6081cc
 
 RUN apk --update add bash curl && \
-    curl -sSL --cacert /opt/factorio.crt https://www.factorio.com/get-download/$VERSION/headless/linux64 | tar -xzf -
+    curl -sSL --cacert /opt/factorio.crt https://www.factorio.com/get-download/$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 && \
+    rm /tmp/factorio_headless_x64_$VERSION.tar.gz
 
 EXPOSE 34197/udp
 
 CMD ["./smart_launch.sh"]
+