diff --git a/ci/docker/powerpc64-unknown-linux-musl/Dockerfile b/ci/docker/powerpc64-unknown-linux-musl/Dockerfile
index b9e47e238abd9..123f1411f3f2b 100644
--- a/ci/docker/powerpc64-unknown-linux-musl/Dockerfile
+++ b/ci/docker/powerpc64-unknown-linux-musl/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:25.04
+FROM ubuntu:plucky-20251001
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
     ca-certificates \