diff --git a/pso/__init__.py b/pso/__init__.py
index c010765..2cf034b 100644
--- a/pso/__init__.py
+++ b/pso/__init__.py
@@ -1,7 +1,7 @@
 from .optimizer import Optimizer
 from .particle import Particle
 
-__version__ = "0.1.4"
+__version__ = "0.1.5"
 
 __all__ = [
     "Optimizer",
diff --git a/setup.py b/setup.py
index 37c1a76..b2b40b9 100644
--- a/setup.py
+++ b/setup.py
@@ -19,7 +19,7 @@ setup(
     ],
     packages=find_packages(exclude=[]),
     keywords=["pso", "tensorflow", "keras"],
-    python_requires="==3.9",
+    python_requires=">=3.8",
     package_data={},
     zip_safe=False,
     long_description=open("README.md", encoding="UTF8").read(),