diff --git a/.github/actions/updpkgsums/Dockerfile b/.github/actions/updpkgsums/Dockerfile
index 05b5188..f276ff1 100644
--- a/.github/actions/updpkgsums/Dockerfile
+++ b/.github/actions/updpkgsums/Dockerfile
@@ -1,4 +1,4 @@
-FROM docker.io/library/archlinux:base-devel
+FROM docker.io/library/archlinux:base-devel@sha256:8745817f349ed24373341ddb92776209eeec3f0364ea48f7f645ac5800d30a50
 
 RUN pacman -Syu --needed --noconfirm pacman-contrib namcap git sudo && \
   useradd -m builder && \