diff --git a/tool/Dockerfile.dev b/tool/Dockerfile.dev
index 8995557a..b9b4571b 100644
--- a/tool/Dockerfile.dev
+++ b/tool/Dockerfile.dev
@@ -23,7 +23,7 @@ COPY dev/static /usr/src/nextcloud/static
 ENV PHP_CLI_SERVER_WORKERS=10
 CMD ["php", "-S", "0.0.0.0:80"]
 
-FROM alpine:latest as apps
+FROM alpine:latest@sha256:eece025e432126ce23f223450a0326fbebde39cdf496a85d8c016293fc851978 as apps
 RUN apk add curl
 
 FROM apps as news