diff --git a/.github/workflows/shellcheck.yml b/.github/workflows/shellcheck.yml
index 6bd443b..55d5097 100644
--- a/.github/workflows/shellcheck.yml
+++ b/.github/workflows/shellcheck.yml
@@ -5,8 +5,8 @@ on:  # yamllint disable-line rule:truthy
   workflow_dispatch:
   push:
     branches:
-      - stable
-      - next
+      - 'gluon-*'  # gluon-next and gluon-v202a.1.x
+      - '!gluon-v2021.1.x'  # shell code is not maintained on this branch
     paths:
       - '**.sh'
   pull_request:
diff --git a/.github/workflows/update-targets.yml b/.github/workflows/update-targets.yml
index bbe6b23..7e8e882 100644
--- a/.github/workflows/update-targets.yml
+++ b/.github/workflows/update-targets.yml
@@ -5,9 +5,7 @@ on:
   workflow_dispatch:
   push:
     branches:
-      - stable
-      - legacy
-      - next
+      - 'gluon-*'  # gluon-next and gluon-v202a.1.x
     paths:
       - 'Makefile'