diff --git a/src/pytz/__init__.py b/src/pytz/__init__.py
index 6b47a9b..612837d 100644
--- a/src/pytz/__init__.py
+++ b/src/pytz/__init__.py
@@ -23,7 +23,7 @@
 
 # The IANA (nee Olson) database is updated several times a year.
 OLSON_VERSION = '2023c'
-VERSION = '2023.3'  # pip compatible version number.
+VERSION = '2023.3.post1'  # pip compatible version number.
 __version__ = VERSION
 
 OLSEN_VERSION = OLSON_VERSION  # Old releases had this misspelling
diff --git a/src/pytz/tests/test_tzinfo.py b/src/pytz/tests/test_tzinfo.py
index 16018fa..28eb054 100644
--- a/src/pytz/tests/test_tzinfo.py
+++ b/src/pytz/tests/test_tzinfo.py
@@ -27,7 +27,7 @@
 
 # I test for expected version to ensure the correct version of pytz is
 # actually being tested.
-EXPECTED_VERSION = '2023.3'
+EXPECTED_VERSION = '2023.3.post1'
 EXPECTED_OLSON_VERSION = '2023c'
 
 fmt = '%Y-%m-%d %H:%M:%S %Z%z'