diff --git a/0.15/Dockerfile b/0.15/Dockerfile
index 68c1c91..4ef0777 100644
--- a/0.15/Dockerfile
+++ b/0.15/Dockerfile
@@ -3,8 +3,8 @@ FROM frolvlad/alpine-glibc:alpine-3.6
 MAINTAINER https://github.com/dtandersen/docker_factorio_server
 
 ENV PORT=34197 \
-    VERSION=0.15.20 \
-    SHA1=cc2b44fc1efbec7c13a1706443279f2779eb9ff0
+    VERSION=0.15.21 \
+    SHA1=07f6b083d55d58eaae6d2e3a7900fce825d2f85c
 
 RUN mkdir /opt && \
     apk add --update --no-cache tini pwgen && \
diff --git a/README.md b/README.md
index 81fe32f..5d144e6 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # Factorio [![](https://images.microbadger.com/badges/image/dtandersen/factorio.svg)](https://microbadger.com/images/dtandersen/factorio "Get your own image badge on microbadger.com") [![Docker Pulls](https://img.shields.io/docker/pulls/dtandersen/factorio.svg)](https://hub.docker.com/r/dtandersen/factorio/) [![Docker Stars](https://img.shields.io/docker/stars/dtandersen/factorio.svg)](https://hub.docker.com/r/dtandersen/factorio/)
 
-* `0.15.20`, `0.15`, `latest` [(0.15/Dockerfile)](https://github.com/dtandersen/docker_factorio_server/blob/master/0.15/Dockerfile)
+* `0.15.21`, `0.15`, `latest` [(0.15/Dockerfile)](https://github.com/dtandersen/docker_factorio_server/blob/master/0.15/Dockerfile)
 * `0.14.23`, `0.14`, `stable` [(0.14/Dockerfile)](https://github.com/dtandersen/docker_factorio_server/blob/master/0.14/Dockerfile)
 * `0.13.20`, `0.13`  [(0.13/Dockerfile)](https://github.com/dtandersen/docker_factorio_server/blob/master/0.13/Dockerfile)