diff --git a/detection_rules/etc/lock-multiple.sh b/detection_rules/etc/lock-multiple.sh
index 5d418b626..20dbe6a71 100755
--- a/detection_rules/etc/lock-multiple.sh
+++ b/detection_rules/etc/lock-multiple.sh
@@ -4,13 +4,24 @@ set -e
 
 CURRENT_BRANCH=$(git rev-parse --abbrev-ref HEAD)
 
-# switch to
-for BRANCH in $(echo $@ | sed "s/,/ /g")
+BRANCHES=($(echo "$@" | sed "s/,/ /g" | tr ' ' '\n' | sort -V))
+LAST_INDEX=$((${#BRANCHES[@]} - 1))
+
+for i in "${!BRANCHES[@]}"
 do
+    BRANCH=${BRANCHES[$i]}
     echo $BRANCH
     git checkout $BRANCH
     git pull
     python -m detection_rules dev build-release --update-version-lock
+
+    # Reset deprecated_rules.json after all branches except the last to prevent
+    # branch-specific deprecations from leaking across checkouts (e.g. D4C rules
+    # deprecated on 8.19 but active on 9.3+). The last branch is closest to main
+    # and carries the correct deprecation state forward.
+    if [ $i -lt $LAST_INDEX ]; then
+        git checkout -- detection_rules/etc/deprecated_rules.json
+    fi
 done
 
 git checkout ${CURRENT_BRANCH}
diff --git a/pyproject.toml b/pyproject.toml
index f2c47dd2c..608cd9e38 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "detection_rules"
-version = "1.6.1"
+version = "1.6.2"
 description = "Detection Rules is the home for rules used by Elastic Security. This repository is used for the development, maintenance, testing, validation, and release of rules for Elastic Security’s Detection Engine."
 readme = "README.md"
 requires-python = ">=3.12"