diff --git a/Dockerfile b/Dockerfile
index dcc50b3..b7b03a7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
-FROM ghcr.io/vilsol/ffmpeg-alpine:latest as ffmpeg
+FROM ghcr.io/vilsol/ffmpeg-alpine:latest@sha256:1bc053b7b5148efea76a6f4ace36247e80e470f24e70ba65e75cfe2d24842ff1 as ffmpeg
 
-FROM alpine:edge
+FROM alpine:edge@sha256:e64a0b2fc7ff870c2b22506009288daa5134da2b8c541440694b629fc22d792e
 
 # ffmpeg
 COPY --from=ffmpeg /root/bin/ffmpeg /bin/ffmpeg