diff --git a/Dockerfile b/Dockerfile
index c48fa0d..f863b86 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -68,7 +68,6 @@ ENV DB_PASSWORD ninja
 ENV APP_KEY SomeRandomString
 ENV LOG errorlog
 ENV APP_DEBUG 0
-ENV APP_CIPHER rijndael-128
 ENV SELF_UPDATER_SOURCE ''
 ENV PHANTOMJS_BIN_PATH /usr/local/bin/phantomjs