diff --git a/src/Dockerfile b/src/Dockerfile
index b6be005..c3b7503 100644
--- a/src/Dockerfile
+++ b/src/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.11
+FROM alpine:3.15
 
 # Use less to view man-pages since busybox `more' lacks the -s option.
 ENV PAGER=less