diff --git a/tools/docker/Dockerfile b/tools/docker/Dockerfile
index caaa77f480e922411ec05c0245dc24683477730f..0b700e1134b23daef0b28c9aeb944091d7dd3205 100644
--- a/tools/docker/Dockerfile
+++ b/tools/docker/Dockerfile
@@ -4,7 +4,7 @@ ARG BASE_IMAGE_TYPE=slim
 # --------------------------------------
 # slim image
 # --------------------------------------
-FROM ghcr.io/renovatebot/base-image:1.20.5@sha256:26bb36bd1eb9cfede7451e3bb9f20ee0c684f6f679d5f253e5a578e3cfa35e84 AS slim-base
+FROM ghcr.io/renovatebot/base-image:1.20.6@sha256:279d1aa081dbd9dc5b0630ce1347edf233fd6f14d747547eac36053b2ab7f9bd AS slim-base
 
 # --------------------------------------
 # full image