diff --git a/Dockerfile b/Dockerfile
index b671d24..035ee8f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,7 +6,7 @@
 ##    docker build --no-cache --target certs -t secret-vault:certs .    ##
 ##############################################################################
 
-FROM alpine as certs
+FROM alpine@sha256:7144f7bab3d4c2648d7e59409f15ec52a18006a128c733fcff20d3a4a54ba44a as certs
 
 RUN apk add --update --no-cache ca-certificates
 
@@ -14,7 +14,7 @@ RUN apk add --update --no-cache ca-certificates
 ##      docker build --no-cache -t secret-vault:local .      ##
 ###############################################################
 
-FROM alpine:latest
+FROM alpine:latest@sha256:7144f7bab3d4c2648d7e59409f15ec52a18006a128c733fcff20d3a4a54ba44a
 
 COPY --from=certs /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt