diff --git a/CHANGELOG.md b/CHANGELOG.md
index 35d6f27..cd12baa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,10 @@
 Changelog
 =========
 
+1.5.1
+------------------
+* Retains userContextIds
+
 1.4.1
 ------------------
 * Support multiple Firefox profiles
diff --git a/ff_containers_sort/ff_containers_sort.py b/ff_containers_sort/ff_containers_sort.py
index 6f30452..bc277d0 100644
--- a/ff_containers_sort/ff_containers_sort.py
+++ b/ff_containers_sort/ff_containers_sort.py
@@ -28,7 +28,7 @@
 ## Author: Naaman Campbell
 ##         12 December 2020
 ##
-## Version: 1.4.1 | 2020-12-14 - NC | Support multiple Firefox profiles
+## Version: 1.5.1 | 2020-12-14 - NC | Retains userContextIds
 ##          See CHANGELOG.md for full details
 ##
 ## Sources:
@@ -61,6 +61,7 @@ def sort_containers(conf_filename, sort, manual):
         conf = json.load(conf_file)
 
     public_identities = [i for i in conf['identities'] if i['public']]
+    private_identities = [i for i in conf['identities'] if not i['public']]
 
     if sort:
         # only sort custom identities
@@ -105,26 +106,6 @@ def sort_containers(conf_filename, sort, manual):
         # sort public identities
         public_identities = [public_identities[int(i) - 1] for i in new_order]
 
-    # determine reserved ids for private identities
-    private_identities = [i for i in conf['identities'] if not i['public']]
-    reserved_ids = [
-        item['userContextId']
-        for item in private_identities
-        if item['userContextId'] < public_identities_count
-    ]
-
-    # generate list of ids with reserved ids removed
-    public_ids = list(
-        range(1, (public_identities_count + 1) + len(reserved_ids))
-    )
-    for resv_id in reserved_ids:
-        public_ids.remove(resv_id)
-
-    # re-number 'public' Container objects
-    for item in public_identities:
-        public_ids.reverse()
-        item['userContextId'] = public_ids.pop()
-
     conf['identities'] = public_identities + private_identities
 
     with open(conf_filename, 'w') as conf_file:
diff --git a/setup.py b/setup.py
index 2c2146a..b8679b0 100644
--- a/setup.py
+++ b/setup.py
@@ -5,7 +5,7 @@
 
 setuptools.setup(
     name="ff-containers-sort",
-    version="1.4.1",
+    version="1.5.1",
     author="Naaman Campbell",
     author_email="naaman@clancampbell.id.au",
     description="Sorts and re-numbers Firefox Containers config objects in Firefox containers.json",