diff --git a/qrencode/Dockerfile b/qrencode/Dockerfile
index 9dd8361..05a9187 100644
--- a/qrencode/Dockerfile
+++ b/qrencode/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:edge as builder
+FROM alpine:3.12 AS builder
 LABEL maintainer="Backplane BV <backplane@users.noreply.github.com>"
 
 RUN apk add --no-cache \
@@ -7,4 +7,4 @@ RUN apk add --no-cache \
 
 WORKDIR /work
 
-ENTRYPOINT [ "/usr/bin/qrencode" ]
\ No newline at end of file
+ENTRYPOINT [ "/usr/bin/qrencode" ]