diff --git a/Dockerfile b/Dockerfile
index ddab88f..b456537 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,8 +1,8 @@
 FROM debian:jessie-slim
 
-ARG FACTORIO_VERSION=0.14.21
+ARG FACTORIO_VERSION=0.13.20
 ARG FACTORIO_HEADLESS_URL=https://www.factorio.com/get-download/${FACTORIO_VERSION}/headless/linux64
-ARG FACTORIO_HEADLESS_SHA512=8a7f1e1214b1bbe79e34abadefcc6083be3830822dbe4570ce7fd96d26c6188460c134a0d53207b4e144022792adf1ff6514caf22d7f01ab106cf2d1c01bc2b1
+ARG FACTORIO_HEADLESS_SHA512=ec2f0dcfff8e0adc5871094b14e172d451e1e49caed07bba573ffa1a2ea834796e2a5f9604c6992d6ecf1a3fa0419fcfae8968434f9b7b4a7b8197b43807de70
 
 # Unpack and reconfigure Factorio
 ADD ${FACTORIO_HEADLESS_URL} /var/tmp/factorio.tar.gz