diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 7431c94..6945518 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -37,4 +37,4 @@ jobs:
         run: pip install -r requirements.txt
 
       - name: Run Python tests
-        run: python -m unittest discover -p 'test_*.py' -v
+        run: pytest
diff --git a/requirements.txt b/requirements.txt
index e69de29..55b033e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -0,0 +1 @@
+pytest
\ No newline at end of file
diff --git a/src/algorithms/arrays/is-monotonic/__pycache__/test_is_monotonic.cpython-311-pytest-8.2.0.pyc b/src/algorithms/arrays/is-monotonic/__pycache__/test_is_monotonic.cpython-311-pytest-8.2.0.pyc
new file mode 100644
index 0000000..e4958db
Binary files /dev/null and b/src/algorithms/arrays/is-monotonic/__pycache__/test_is_monotonic.cpython-311-pytest-8.2.0.pyc differ
diff --git a/src/algorithms/arrays/is-monotonic/test_is_monotonic.py b/src/algorithms/arrays/is-monotonic/test_is_monotonic.py
index a8ebbce..f80d334 100644
--- a/src/algorithms/arrays/is-monotonic/test_is_monotonic.py
+++ b/src/algorithms/arrays/is-monotonic/test_is_monotonic.py
@@ -1,27 +1,15 @@
-import unittest
 from is_monotonic import Solution, AnotherSolution
 
 
-class TestIsMonotonic(unittest.TestCase):
+def test_solution_isMonotonic():
+    solution = Solution()
+    assert solution.isMonotonic([1, 2, 2, 3])
+    assert solution.isMonotonic([6, 5, 4, 4])
+    assert not solution.isMonotonic([1, 3, 2])
 
-    def setUp(self):
-        self.solution = Solution()
-        self.another_solution = AnotherSolution()
 
-    def test_solution_isMonotonic(self):
-        self.assertTrue(self.solution.isMonotonic([1, 2, 2, 3]))
-
-        self.assertTrue(self.solution.isMonotonic([6, 5, 4, 4]))
-
-        self.assertFalse(self.solution.isMonotonic([1, 3, 2]))
-
-    def test_another_solution_isMonotonic(self):
-        self.assertTrue(self.another_solution.isMonotonic([1, 2, 2, 3]))
-
-        self.assertTrue(self.another_solution.isMonotonic([6, 5, 4, 4]))
-
-        self.assertFalse(self.another_solution.isMonotonic([1, 3, 2]))
-
-
-if __name__ == '__main__':
-    unittest.main()
+def test_another_solution_isMonotonic():
+    another_solution = AnotherSolution()
+    assert another_solution.isMonotonic([1, 2, 2, 3])
+    assert another_solution.isMonotonic([6, 5, 4, 4])
+    assert not another_solution.isMonotonic([1, 3, 2])