diff --git a/Dockerfile b/Dockerfile
index 17962ac..c54bec9 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM docker.io/library/alpine:3.14 as runtime
+FROM docker.io/library/alpine:3.15 as runtime
 
 ENTRYPOINT ["seiso"]