diff --git a/Dockerfile b/Dockerfile
index 9cc2674..5b423e3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,7 +6,7 @@ WORKDIR /src
 USER nobody:nobody
 RUN cargo build --release
 
-FROM alpine:3.15@sha256:21a3deaa0d32a8057914f36584b5288d2e5ecc984380bc0118285c70fa8c9300
+FROM alpine:3.21@sha256:a8560b36e8b8210634f77d9f7f9efd7ffa463e380b75e2e74aff4511df3ef88c
 
 COPY --from=builder /src/target/release/git-cvs-fast-import /usr/local/bin/git-cvs-fast-import
 ENTRYPOINT ["/usr/local/bin/git-cvs-fast-import"]