diff --git a/mercury/Dockerfile b/mercury/Dockerfile
index db1380ff..651d30dd 100644
--- a/mercury/Dockerfile
+++ b/mercury/Dockerfile
@@ -1,5 +1,5 @@
 # TODO: requires python3.8
-FROM alpine:3.15
+FROM alpine:3.13
 LABEL maintainer="Charlie Lewis <clewis@iqt.org>"
 
 ENV DEBIAN_FRONTEND noninteractive