diff --git a/.github/actions/updpkgsums/Dockerfile b/.github/actions/updpkgsums/Dockerfile
index 05b5188..f33a125 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:c26263d698029443e20a4dcfa26d4c7180216f28fa5dbe6a6c12f8f031dc757b
 
 RUN pacman -Syu --needed --noconfirm pacman-contrib namcap git sudo && \
   useradd -m builder && \