diff --git a/Dockerfile b/Dockerfile
index c246d77..1a6ee05 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,9 +1,9 @@
-FROM rust:1.70 as builder
+FROM rust:1.70@sha256:dbdf8893bda954a9d222e1385516fe583d37befffaa274ab97874ec30fa4bcef as builder
 WORKDIR ./src/
 COPY . .
 RUN cargo install --path .
 
-FROM debian:bullseye-slim
+FROM debian:bullseye-slim@sha256:00558f781b91e90469812bad32002f311ab26ef241b4a1996f6600680ec82f5c
 RUN apt-get update && apt-get -y install ca-certificates && rm -rf /var/lib/apt/lists/*
 COPY --from=builder /usr/local/cargo/bin/cloudflare-dynamic-dns /usr/local/bin/cloudflare-dynamic-dns
 CMD ["cloudflare-dynamic-dns"]
\ No newline at end of file