diff --git a/script/bump-version.py b/script/bump-version.py
index 1f034344f..3e1e473c4 100755
--- a/script/bump-version.py
+++ b/script/bump-version.py
@@ -45,7 +45,7 @@ def sub(path, pattern, repl, expected_count=1):
     content, count = re.subn(pattern, repl, content, flags=re.MULTILINE)
     if expected_count is not None:
         assert count == expected_count, f"Pattern {pattern} replacement failed!"
-    with open(path, "wt") as fh:
+    with open(path, "w") as fh:
         fh.write(content)
 
 
diff --git a/tests/unit_tests/test_cpp_generator.py b/tests/unit_tests/test_cpp_generator.py
index 331c500c0..6f4b5a40b 100644
--- a/tests/unit_tests/test_cpp_generator.py
+++ b/tests/unit_tests/test_cpp_generator.py
@@ -1,4 +1,4 @@
-from typing import Iterator
+from collections.abc import Iterator
 
 import math
 
diff --git a/tests/unit_tests/test_cpp_helpers.py b/tests/unit_tests/test_cpp_helpers.py
index ad234250c..497b3966f 100644
--- a/tests/unit_tests/test_cpp_helpers.py
+++ b/tests/unit_tests/test_cpp_helpers.py
@@ -1,5 +1,5 @@
 import pytest
-from mock import Mock
+from unittest.mock import Mock
 
 from esphome import cpp_helpers as ch
 from esphome import const