diff --git a/.github/workflows/run-tests.yaml b/.github/workflows/run-tests.yaml
index d48a350..75178b1 100644
--- a/.github/workflows/run-tests.yaml
+++ b/.github/workflows/run-tests.yaml
@@ -20,6 +20,6 @@ jobs:
           fetch-depth: 0
       - uses: actions/setup-python@v5
         with:
-          python-version: '3.10'
+          python-version: '3.9'
       - name: Build & Test
         run: ./ci/build-test.sh
diff --git a/src/rapids_pre_commit_hooks/copyright.py b/src/rapids_pre_commit_hooks/copyright.py
index e93470b..64b56f8 100644
--- a/src/rapids_pre_commit_hooks/copyright.py
+++ b/src/rapids_pre_commit_hooks/copyright.py
@@ -95,7 +95,7 @@ def apply_copyright_check(linter, old_content):
             old_content, old_copyright_matches
         ) == strip_copyright(linter.content, new_copyright_matches):
             for old_match, new_match in zip(
-                old_copyright_matches, new_copyright_matches, strict=True
+                old_copyright_matches, new_copyright_matches
             ):
                 if old_match.group() != new_match.group():
                     apply_copyright_revert(linter, old_match, new_match)
diff --git a/src/rapids_pre_commit_hooks/lint.py b/src/rapids_pre_commit_hooks/lint.py
index 3919030..16b9f6e 100644
--- a/src/rapids_pre_commit_hooks/lint.py
+++ b/src/rapids_pre_commit_hooks/lint.py
@@ -16,7 +16,6 @@
 import bisect
 import contextlib
 import functools
-import itertools
 import re
 import warnings
 
@@ -24,6 +23,18 @@
 from rich.markup import escape
 
 
+# Taken from Python docs
+# (https://docs.python.org/3.12/library/itertools.html#itertools.pairwise)
+# Replace with itertools.pairwise after dropping Python 3.9 support
+def _pairwise(iterable):
+    # pairwise('ABCDEFG') → AB BC CD DE EF FG
+    iterator = iter(iterable)
+    a = next(iterator, None)
+    for b in iterator:
+        yield a, b
+        a = b
+
+
 class OverlappingReplacementsError(RuntimeError):
     pass
 
@@ -98,7 +109,7 @@ def fix(self):
             key=lambda replacement: replacement.pos,
         )
 
-        for r1, r2 in itertools.pairwise(sorted_replacements):
+        for r1, r2 in _pairwise(sorted_replacements):
             if r1.pos[1] > r2.pos[0]:
                 raise OverlappingReplacementsError(f"{r1} overlaps with {r2}")
 
@@ -204,7 +215,9 @@ def __gt__(self, other):
             def __eq__(self, other):
                 return self.pos[0] <= other <= self.pos[1]
 
-        line_index = bisect.bisect_left(self.lines, index, key=LineComparator)
+        line_index = bisect.bisect_left(
+            [LineComparator(line) for line in self.lines], index
+        )
         try:
             line_pos = self.lines[line_index]
         except IndexError: