diff --git a/Dockerfile b/Dockerfile
index b1c35c6..6250043 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.12
+FROM alpine:3.15.4
 
 RUN apk --no-cache add \
   curl bind-tools netcat-openbsd fish jq coreutils