diff --git a/Dockerfile-3.1 b/Dockerfile-3.1
index c3c8439..7ddef49 100644
--- a/Dockerfile-3.1
+++ b/Dockerfile-3.1
@@ -1,5 +1,5 @@
 # vim:set ft=dockerfile:
-FROM alpine:3.1
+FROM alpine:3.18.5
 
 LABEL maintainer="Andrius Kairiukstis <k@andrius.mobi>"