diff --git a/Dockerfile b/Dockerfile
index 010de5b..f1da84c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,6 +5,7 @@ MAINTAINER zopanix <zopanix@gmail.com>
 WORKDIR /opt
 
 COPY ./smart_launch.sh /opt
+COPY ./factorio.crt /opt
 
 VOLUME /opt/factorio/saves /opt/factorio/mods
 
@@ -16,10 +17,8 @@ ENV FACTORIO_AUTOSAVE_INTERVAL=2 \
     FACTORIO_SHA1=77d92ecc52989f3283462fd5c9b5ba07eb6081cc
 
 RUN apk --update add bash curl && \
-    curl -L -k https://www.factorio.com/get-download/$VERSION/headless/linux64 -o /tmp/factorio_headless_x64_$VERSION.tar.gz && \
-    ls -al /tmp && \
-    sha1sum -b /tmp/factorio_headless_x64_$VERSION.tar.gz && \
-    echo "$FACTORIO_SHA1  /tmp/factorio_headless_x64_$VERSION.tar.gz" | sha1sum -b -c && \
+    curl -sSL --cacert /opt/factorio.crt https://www.factorio.com/get-download/$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