diff --git a/Dockerfile b/Dockerfile
index 634030c..3562983 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,2 +1,6 @@
+# https://docs.renovatebot.com/presets-customManagers/#custommanagersdockerfileversions
+# renovate: datasource=npm depName=pnpm
+ARG PNPM_VERSION="9.0.0"
+
 FROM gitea/act_runner:nightly@sha256:38f9543bf786c0d9dc80c346ec55c7112e348d2e9c6ec3c35a460b6cb96d327f
 FROM docker.io/murielmay67761/docker-example:0.0.4
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