diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index be0897bb..e07296bb 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -55,8 +55,8 @@ jobs:
     runs-on: ubuntu-latest
     needs: [check-secret]
     env:
-      RIOT_BRANCH: '2026.04-branch'
-      VERSION_TAG: '2026.07'
+      RIOT_BRANCH: 'master'
+      VERSION_TAG: '2026.10'
       DOCKER_REGISTRY: "${{ secrets.DOCKER_REGISTRY || 'local' }}"
 
     steps:
diff --git a/README.md b/README.md
index 55b9c37d..793dbf73 100644
--- a/README.md
+++ b/README.md
@@ -76,3 +76,14 @@ or test of your liking:
 ```sh
 BUILD_IN_DOCKER=1 DOCKER_IMAGE=f610ef8e4bbd BOARD=nrf52840dk make -C tests/sys/shell
 ```
+
+## Notes for Release Managers
+
+The version in `.github/workflows/build.yml` has to be advanced on every RIOT
+release and be ahead of the RIOT release. For example, when RIOT 2026.07 was
+released, the version for the docker container has to be advanced to 2026.10.
+
+By advancing the version, the image version matching the RIOT release version
+on the Docker Hub will not be changed anymore by changes to the container
+repository and therefore will not cause issues with the Buildsystem Sanity
+Check of RIOT.