diff --git a/lib/pytz/__init__.py b/lib/pytz/__init__.py
index 4fdc9a7e..11d2e2ca 100644
--- a/lib/pytz/__init__.py
+++ b/lib/pytz/__init__.py
@@ -23,7 +23,7 @@ from pytz.tzfile import build_tzinfo
 
 # The IANA (nee Olson) database is updated several times a year.
 OLSON_VERSION = '2022g'
-VERSION = '2022.7'  # pip compatible version number.
+VERSION = '2022.7.1'  # pip compatible version number.
 __version__ = VERSION
 
 OLSEN_VERSION = OLSON_VERSION  # Old releases had this misspelling
@@ -202,9 +202,7 @@ def _case_insensitive_zone_lookup(zone):
     """case-insensitively matching timezone, else return zone unchanged"""
     global _all_timezones_lower_to_standard
     if _all_timezones_lower_to_standard is None:
-        global _all_timezones_unchecked
         _all_timezones_lower_to_standard = dict((tz.lower(), tz) for tz in _all_timezones_unchecked)  # noqa
-        del _all_timezones_unchecked
     return _all_timezones_lower_to_standard.get(zone.lower()) or zone  # noqa
 
 
diff --git a/requirements.txt b/requirements.txt
index 9aacb2e9..017ae555 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -35,7 +35,7 @@ PyJWT==2.6.0
 pyparsing==3.0.9
 python-dateutil==2.8.2
 python-twitter==3.5
-pytz==2022.7
+pytz==2022.7.1
 requests==2.28.2
 requests-oauthlib==1.3.1
 rumps==0.4.0; platform_system == "Darwin"