diff --git a/Dockerfile-alpine b/Dockerfile-alpine
index f11d181f3..38ce8fded 100644
--- a/Dockerfile-alpine
+++ b/Dockerfile-alpine
@@ -2,7 +2,7 @@
 #
 # Use of this source code is governed by the LICENSE file in this repository.
 
-FROM alpine
+FROM alpine:3.18.2@sha256:25fad2a32ad1f6f510e528448ae1ec69a28ef81916a004d3629874104f8a7f70
 
 RUN apk add --update --no-cache ca-certificates