diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index a2047e1b..092cc5a4 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -19,7 +19,7 @@ repos:
   # Flake8: complexity and style checking
   # https://flake8.pycqa.org/en/latest/user/using-hooks.html
   - repo: https://github.com/pycqa/flake8
-    rev: 4.0.1
+    rev: 5.0.4
     hooks:
       - id: flake8
         additional_dependencies: [flake8-docstrings]
diff --git a/dataprofiler/data_readers/parquet_data.py b/dataprofiler/data_readers/parquet_data.py
index ee625316..0af1b563 100644
--- a/dataprofiler/data_readers/parquet_data.py
+++ b/dataprofiler/data_readers/parquet_data.py
@@ -68,7 +68,7 @@ def __init__(
             self._load_data(data)
 
     @property
-    def file_encoding(self) -> None:
+    def file_encoding(self) -> Optional[str]:
         """Set file encoding to None since not detected for avro."""
         return None
 
diff --git a/dataprofiler/tests/profilers/test_categorical_column_profile.py b/dataprofiler/tests/profilers/test_categorical_column_profile.py
index 55d2ea68..16a223f4 100644
--- a/dataprofiler/tests/profilers/test_categorical_column_profile.py
+++ b/dataprofiler/tests/profilers/test_categorical_column_profile.py
@@ -1,4 +1,5 @@
 import json
+import math
 import os
 import unittest
 from collections import defaultdict
@@ -731,7 +732,44 @@ def test_categorical_diff(self):
             },
         }
         actual_diff = profile.diff(profile2)
-        self.assertDictEqual(expected_diff, actual_diff)
+
+        assert expected_diff["categorical"] == actual_diff["categorical"]
+        assert (
+            expected_diff["statistics"]["unique_count"]
+            == actual_diff["statistics"]["unique_count"]
+        )
+        assert math.isclose(
+            expected_diff["statistics"]["unique_ratio"],
+            actual_diff["statistics"]["unique_ratio"],
+        )
+        assert (
+            expected_diff["statistics"]["categories"]
+            == actual_diff["statistics"]["categories"]
+        )
+        assert math.isclose(
+            expected_diff["statistics"]["gini_impurity"],
+            actual_diff["statistics"]["gini_impurity"],
+        )
+        assert math.isclose(
+            expected_diff["statistics"]["unalikeability"],
+            actual_diff["statistics"]["unalikeability"],
+        )
+        assert (
+            expected_diff["statistics"]["categorical_count"]
+            == actual_diff["statistics"]["categorical_count"]
+        )
+        assert math.isclose(
+            expected_diff["statistics"]["chi2-test"]["chi2-statistic"],
+            actual_diff["statistics"]["chi2-test"]["chi2-statistic"],
+        )
+        assert (
+            expected_diff["statistics"]["chi2-test"]["deg_of_free"]
+            == actual_diff["statistics"]["chi2-test"]["deg_of_free"]
+        )
+        assert math.isclose(
+            expected_diff["statistics"]["chi2-test"]["p-value"],
+            actual_diff["statistics"]["chi2-test"]["p-value"],
+        )
 
         # Test with one categorical column matching
         df_not_categorical = pd.Series(
diff --git a/dataprofiler/tests/profilers/test_profile_builder.py b/dataprofiler/tests/profilers/test_profile_builder.py
index f9bbf14a..02521194 100644
--- a/dataprofiler/tests/profilers/test_profile_builder.py
+++ b/dataprofiler/tests/profilers/test_profile_builder.py
@@ -1,5 +1,6 @@
 import json
 import logging
+import math
 import os
 import random
 import re
@@ -2162,8 +2163,18 @@ def test_diff_categorical_chi2_test(self, *mocks):
             "deg_of_free": 2,
             "p-value": 0.3099238764710244,
         }
-        self.assertDictEqual(
-            expected_chi2_test_dict, diff["data_stats"][0]["statistics"]["chi2-test"]
+        actual_chi2_test_dict = diff["data_stats"][0]["statistics"]["chi2-test"]
+
+        assert math.isclose(
+            expected_chi2_test_dict["chi2-statistic"],
+            actual_chi2_test_dict["chi2-statistic"],
+        )
+        assert (
+            expected_chi2_test_dict["deg_of_free"]
+            == actual_chi2_test_dict["deg_of_free"]
+        )
+        assert math.isclose(
+            expected_chi2_test_dict["p-value"], actual_chi2_test_dict["p-value"]
         )
 
     @mock.patch(