diff --git a/Dockerfile b/Dockerfile
index 34a6619..cdd1421 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.14.2
+FROM alpine:3.14.2@sha256:e1c082e3d3c45cccac829840a25941e679c25d438cc8412c2fa221cf1a824e6a
 
 RUN apk --no-cache add nodejs="14.18.1-r0"