diff --git a/osxphotos/_constants.py b/osxphotos/_constants.py
index a1d58f26..11059831 100644
--- a/osxphotos/_constants.py
+++ b/osxphotos/_constants.py
@@ -16,8 +16,9 @@ _TESTED_DB_VERSIONS = ["6000", "4025", "4016", "3301", "2622"]
 # only version 3 - 4 have RKVersion.selfPortrait
 _PHOTOS_3_VERSION = "3301"
 
-# versions later than this have a different database structure
-_PHOTOS_5_VERSION = "6000"
+# versions 5.0 and later have a different database structure
+_PHOTOS_4_VERSION = "4025" # latest Mojove version on 10.14.6
+_PHOTOS_5_VERSION = "6000" # seems to be current on 10.15.1 through 10.14.4
 
 # which major version operating systems have been tested
 _TESTED_OS_VERSIONS = ["12", "13", "14", "15"]
diff --git a/osxphotos/_version.py b/osxphotos/_version.py
index b52d5384..775b76b7 100644
--- a/osxphotos/_version.py
+++ b/osxphotos/_version.py
@@ -1,3 +1,3 @@
 """ version info """
 
-__version__ = "0.27.4"
+__version__ = "0.27.5"
diff --git a/osxphotos/photosdb.py b/osxphotos/photosdb.py
index ab6ed467..1b9d6085 100644
--- a/osxphotos/photosdb.py
+++ b/osxphotos/photosdb.py
@@ -19,6 +19,7 @@ from ._constants import (
     _MOVIE_TYPE,
     _PHOTO_TYPE,
     _PHOTOS_3_VERSION,
+    _PHOTOS_4_VERSION,
     _PHOTOS_5_VERSION,
     _TESTED_DB_VERSIONS,
     _TESTED_OS_VERSIONS,
@@ -258,7 +259,7 @@ class PhotosDB:
         if _debug():
             logging.debug(f"library = {library_path}, masters = {masters_path}")
 
-        if int(self._db_version) < int(_PHOTOS_5_VERSION):
+        if int(self._db_version) <= int(_PHOTOS_4_VERSION):
             self._process_database4()
         else:
             self._process_database5()