diff --git a/Dockerfile b/Dockerfile
index ddab88f..37bd58d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,8 +1,8 @@
 FROM debian:jessie-slim
 
-ARG FACTORIO_VERSION=0.14.21
+ARG FACTORIO_VERSION=0.12.35
 ARG FACTORIO_HEADLESS_URL=https://www.factorio.com/get-download/${FACTORIO_VERSION}/headless/linux64
-ARG FACTORIO_HEADLESS_SHA512=8a7f1e1214b1bbe79e34abadefcc6083be3830822dbe4570ce7fd96d26c6188460c134a0d53207b4e144022792adf1ff6514caf22d7f01ab106cf2d1c01bc2b1
+ARG FACTORIO_HEADLESS_SHA512=0333b25ab8e690bc2e923e2d39c9585f7d6b1d928c0347038741e3a5ccc444598723e9559b0f2a9ef2defcdf6a8f67d696ffcbea730142862d45c1661d653380
 
 # Unpack and reconfigure Factorio
 ADD ${FACTORIO_HEADLESS_URL} /var/tmp/factorio.tar.gz