diff --git a/src/docker.ts b/src/docker.ts
index 07a2811d..2f4ceccf 100644
--- a/src/docker.ts
+++ b/src/docker.ts
@@ -1,7 +1,7 @@
 class Docker {
   readonly repository = 'renovate/renovate';
   // renovate: datasource=docker depName=renovate/renovate versioning=docker
-  readonly tag = '21.12.4-slim';
+  readonly tag = '21.12.6-slim';
   readonly tagSuffix = '-slim';
 
   image(): string {