diff --git a/.github/renovate.json5 b/.github/renovate.json5
index 33124336d..2a81e8205 100644
--- a/.github/renovate.json5
+++ b/.github/renovate.json5
@@ -12,7 +12,7 @@
     automerge: true,
     schedule: 'after 5pm on the first day of the month',
   },
-  baseBranches: ['1.15', '1.17', '1.18', '1.19', '1.20', 'master'],
+  baseBranches: ['1.15', '1.17', '1.18', '1.19', '1.20', '1.21.0', 'master'],
   'pre-commit': { enabled: true },
   regexManagers: [
     /** Do updates on pre-commit additional dependencies */
diff --git a/.github/workflows/audit.yaml b/.github/workflows/audit.yaml
index 3cc766452..0fdcd0a0d 100644
--- a/.github/workflows/audit.yaml
+++ b/.github/workflows/audit.yaml
@@ -19,6 +19,7 @@ jobs:
           - '1.18'
           - '1.19'
           - '1.20'
+          - 1.21.0
 
     steps:
       - run: pip install pyOpenSSL --upgrade
diff --git a/SECURITY.md b/SECURITY.md
index 6f818e61a..6e2a610f1 100644
--- a/SECURITY.md
+++ b/SECURITY.md
@@ -12,3 +12,4 @@
 | 1.18    | Best effort     |
 | 1.19    | Best effort     |
 | 1.20    | Best effort     |
+| 1.21.0  | Best effort     |