diff --git a/core/Dockerfile b/core/Dockerfile
index 71184c1..a573332 100644
--- a/core/Dockerfile
+++ b/core/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:latest
+FROM alpine:3.14.0
 LABEL MAINTAINER="heckyel@riseup.net"
 
 ENV LANG C.UTF-8