diff --git a/Dockerfile b/Dockerfile
index 8caccad..9cce09f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM golang:1.20.7-bullseye@sha256:c95c52c458a2678251e0769ea13c710b0c52814771c53a495f53b9e87f9c0e99 as build
+FROM golang:1.21.0-bullseye@sha256:02f350d8452d3f9693a450586659ecdc6e40e9be8f8dfc6d402300d87223fdfa as build
 
 # renovate: datasource=github-tags depName=aptible/supercronic versioning=semver
 ENV SUPERCRONIC_VERSION v0.2.26