diff --git a/GitVersion.yml b/GitVersion.yml
index b207ecc..946f22d 100644
--- a/GitVersion.yml
+++ b/GitVersion.yml
@@ -50,7 +50,7 @@ branches:
     label: "alpha"
     increment: Patch
     source-branches: [vX-release]
-    is-main-branch: false
+    is-main-branch: true
     pre-release-weight: 30000
 
   main:
@@ -73,10 +73,7 @@ branches:
       when-current-commit-tagged: false
     track-merge-message: true
     regex: ^(pull-requests|pull|pr)[\/-](?<Number>\d*)
-    source-branches:
-      - main
-      - vX-release
-      - dev-vX
+    source-branches: [vX-release]
     pre-release-weight: 30000
 
   unknown:
diff --git a/SECURITY.md b/SECURITY.md
index 64f97df..d0210ff 100644
--- a/SECURITY.md
+++ b/SECURITY.md
@@ -11,6 +11,7 @@ The following table outlines the versions of the project that are currently supp
 |-----------------|-----------------|----------------------|-------------|
 | [13.x](https://github.com/jcdcdev/Umbraco.Community.DataProtection/tree/v13) | 13 | 2025-12-14 | 2026-12-14 |
 | [17.x](https://github.com/jcdcdev/Umbraco.Community.DataProtection/tree/v17) | 17 | 2027-11-27 | 2028-11-27 |
+| [18.x](https://github.com/jcdcdev/Umbraco.Community.DataProtection/tree/v18) | 18 | 2027-03-25 | 2027-06-25 |
 
 ## Unsupported Versions