diff --git a/local/scripts/bump-fork.sh b/local/scripts/bump-fork.sh
index cad9a9f554..4b9b2de576 100755
--- a/local/scripts/bump-fork.sh
+++ b/local/scripts/bump-fork.sh
@@ -11,6 +11,14 @@
 
 set -euo pipefail
 
+# Derive Red Bear OS version from the current git branch name.
+# Branch "0.3.1" → BRANCH_VERSION="0.3.1". Same pattern as
+# local/scripts/build-redbear.sh:158-165. Falls back to "0.0.0" if
+# the branch name doesn't match semver.
+BRANCH_VERSION=$(git -C "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)" branch --show-current 2>/dev/null | grep -oE '[0-9]+\.[0-9]+\.[0-9]+' | head -1 || true)
+BRANCH_VERSION="${BRANCH_VERSION:-0.0.0}"
+export BRANCH_VERSION
+
 COMPONENT="${1:-}"
 if [[ -z "$COMPONENT" ]]; then
     echo "Usage: $0 <component> [--version=X.Y.Z]"