diff --git a/.bumpversion.cfg b/.bumpversion.cfg
index 4386ac16..bbcd90d7 100644
--- a/.bumpversion.cfg
+++ b/.bumpversion.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 3.5.1
+current_version = 3.5.2
 commit = True
 tag = True
 
diff --git a/.cookiecutterrc b/.cookiecutterrc
index bfdbdaab..a9fdd690 100644
--- a/.cookiecutterrc
+++ b/.cookiecutterrc
@@ -54,7 +54,7 @@ default_context:
     sphinx_doctest: "no"
     sphinx_theme: "sphinx-py3doc-enhanced-theme"
     test_matrix_separate_coverage: "no"
-    version: 3.5.1
+    version: 3.5.2
     version_manager: "bump2version"
     website: "https://github.com/NREL"
     year_from: "2023"
diff --git a/README.rst b/README.rst
index c56f0c8a..d4ea51bf 100644
--- a/README.rst
+++ b/README.rst
@@ -51,9 +51,9 @@ Free software: `MIT license <LICENSE>`__
     :alt: Supported implementations
     :target: https://pypi.org/project/geophires-x
 
-.. |commits-since| image:: https://img.shields.io/github/commits-since/softwareengineerprogrammer/GEOPHIRES-X/v3.5.1.svg
+.. |commits-since| image:: https://img.shields.io/github/commits-since/softwareengineerprogrammer/GEOPHIRES-X/v3.5.2.svg
     :alt: Commits since latest release
-    :target: https://github.com/softwareengineerprogrammer/GEOPHIRES-X/compare/v3.5.1...main
+    :target: https://github.com/softwareengineerprogrammer/GEOPHIRES-X/compare/v3.5.2...main
 
 .. |docs| image:: https://readthedocs.org/projects/GEOPHIRES-X/badge/?style=flat
     :target: https://nrel.github.io/GEOPHIRES-X
diff --git a/docs/conf.py b/docs/conf.py
index c805c15b..ee12941e 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -18,7 +18,7 @@
 year = '2024'
 author = 'NREL'
 copyright = f'{year}, {author}'
-version = release = '3.5.1'
+version = release = '3.5.2'
 
 pygments_style = 'trac'
 templates_path = ['./templates']
diff --git a/setup.py b/setup.py
index 6dcc803d..a9b41671 100755
--- a/setup.py
+++ b/setup.py
@@ -13,7 +13,7 @@ def read(*names, **kwargs):
 
 setup(
     name='geophires-x',
-    version='3.5.1',
+    version='3.5.2',
     license='MIT',
     description='GEOPHIRES is a free and open-source geothermal techno-economic simulator.',
     long_description='{}\n{}'.format(
diff --git a/src/geophires_x/OptionList.py b/src/geophires_x/OptionList.py
index 3db6a198..8abf17a5 100644
--- a/src/geophires_x/OptionList.py
+++ b/src/geophires_x/OptionList.py
@@ -21,6 +21,9 @@ def __init__(self, int_value: int, _: str):
     def __eq__(self, other):
         return str(self) == str(other)
 
+    def __ne__(self, other):
+        return str(self) != str(other)
+
 
 class EndUseOptions(GeophiresInputEnum):
     ELECTRICITY = 1, "Electricity"
diff --git a/src/geophires_x/__init__.py b/src/geophires_x/__init__.py
index bf5afe7f..0bc4055f 100644
--- a/src/geophires_x/__init__.py
+++ b/src/geophires_x/__init__.py
@@ -1 +1 @@
-__version__ = '3.5.1'
+__version__ = '3.5.2'
diff --git a/tests/geophires_x_tests/test_options_list.py b/tests/geophires_x_tests/test_options_list.py
index 3fb7f6f0..db4ff9e7 100644
--- a/tests/geophires_x_tests/test_options_list.py
+++ b/tests/geophires_x_tests/test_options_list.py
@@ -21,10 +21,15 @@ def test_cast_from_name_string(self):
     def test_equality(self):
         self.assertFalse(EndUseOptions.HEAT == EndUseOptions.ELECTRICITY)
         self.assertTrue(EndUseOptions.HEAT == EndUseOptions.HEAT)
+        self.assertTrue(EndUseOptions.HEAT != EndUseOptions.ELECTRICITY)
+        self.assertTrue(EndUseOptions.ELECTRICITY != EndUseOptions.HEAT)
         self.assertFalse(EndUseOptions.HEAT is None)
         self.assertTrue(EndUseOptions.HEAT is EndUseOptions.HEAT)
-        # self.assertTrue(EndUseOptions.HEAT == 'HEAT')
-        # self.assertFalse(EndUseOptions.HEAT == 'Electricity')
+        self.assertFalse(EndUseOptions.HEAT is EndUseOptions.ELECTRICITY)
+        self.assertTrue(EndUseOptions.HEAT is not EndUseOptions.ELECTRICITY)
+
+        self.assertEqual(str(EndUseOptions.HEAT), 'EndUseOptions.HEAT')
+        self.assertEqual(str(EndUseOptions.ELECTRICITY), 'EndUseOptions.ELECTRICITY')
 
 
 class WellDrillingCostCorrelationTestCase(BaseTestCase):