diff --git a/pyproject.toml b/pyproject.toml
index 13bd233..085b5ee 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "fastpdb"
-version = "1.3.0"
+version = "1.3.1"
 description = "A high performance drop-in replacement for Biotite's PDBFile."
 readme = "README.rst"
 requires-python = ">=3.7"
diff --git a/python-src/fastpdb/__init__.py b/python-src/fastpdb/__init__.py
index f47443b..e6438cf 100644
--- a/python-src/fastpdb/__init__.py
+++ b/python-src/fastpdb/__init__.py
@@ -1,7 +1,7 @@
 __name__ = "fastpdb"
 __author__ = "Patrick Kunzmann"
 __all__ = ["PDBFile"]
-__version__ = "1.3.0"
+__version__ = "1.3.1"
 
 import os
 import warnings