diff --git a/Dockerfile b/Dockerfile
index fe3fc456..7e8d8c3a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,7 +3,7 @@
 # SPDX-License-Identifier: Apache-2.0
 
 #############      builder                                  #############
-FROM golang:1.25.5 AS builder
+FROM golang:1.26rc2 AS builder
 
 WORKDIR /go/src/github.com/gardener/machine-controller-manager-provider-openstack
 COPY . .