diff --git a/setup.py b/setup.py
index feca20c4..8d530f49 100644
--- a/setup.py
+++ b/setup.py
@@ -61,7 +61,7 @@
     test_suite='tests',
     tests_require=test_requirements,
     url='https://github.com/JohannesBuchner/ultranest',
-    version='3.3.0',
+    version='3.3.1',
     zip_safe=False,
     cmdclass={'build_ext': build_ext},
 )
diff --git a/ultranest/__init__.py b/ultranest/__init__.py
index 605cc3a2..7d9cf73a 100644
--- a/ultranest/__init__.py
+++ b/ultranest/__init__.py
@@ -10,4 +10,4 @@
 
 __author__ = """Johannes Buchner"""
 __email__ = 'johannes.buchner.acad@gmx.com'
-__version__ = '3.3.0'
+__version__ = '3.3.1'