The next major release will be 5.0.

4.5 was a placeholder release number in case a major release was required
prior to the release of Pg12.

repmgr.control

@@ -1,6 +1,6 @@
 # repmgr extension
 comment = 'Replication manager for PostgreSQL'
-default_version = '4.5'
+default_version = '5.0'
 module_pathname = '$libdir/repmgr'
 relocatable = false
 schema = repmgr