diff --git a/packages/server/src/utils/git-branch-validation.ts b/packages/server/src/utils/git-branch-validation.ts
index 71451390d..43b69fd16 100644
--- a/packages/server/src/utils/git-branch-validation.ts
+++ b/packages/server/src/utils/git-branch-validation.ts
@@ -1,3 +1,3 @@
 // Valid git branch names per git-check-ref-format rules.
 // Rejects shell metacharacters that would enable command injection.
-export const VALID_BRANCH_REGEX = /^[a-zA-Z0-9._\-/]+$/;
+export const VALID_BRANCH_REGEX = /^[a-zA-Z0-9._\-/#]+$/;