diff --git a/test_runner/fixtures/neon_fixtures.py b/test_runner/fixtures/neon_fixtures.py
index 41377e2db2..5c865baa54 100644
--- a/test_runner/fixtures/neon_fixtures.py
+++ b/test_runner/fixtures/neon_fixtures.py
@@ -2721,7 +2721,12 @@ class PgBin:
         env.update(env_add)
         return env
 
-    def run(self, command: List[str], env: Optional[Env] = None, cwd: Optional[str] = None):
+    def run(
+        self,
+        command: List[str],
+        env: Optional[Env] = None,
+        cwd: Optional[Union[str, Path]] = None,
+    ):
         """
         Run one of the postgres binaries.
 
diff --git a/test_runner/regress/test_pg_regress.py b/test_runner/regress/test_pg_regress.py
index 2b1b7fff34..c00a8ff6b7 100644
--- a/test_runner/regress/test_pg_regress.py
+++ b/test_runner/regress/test_pg_regress.py
@@ -1,8 +1,10 @@
 #
 # This file runs pg_regress-based tests.
 #
+from __future__ import annotations
+
 from pathlib import Path
-from typing import Optional
+from typing import TYPE_CHECKING
 
 import pytest
 from fixtures.neon_fixtures import (
@@ -11,6 +13,12 @@ from fixtures.neon_fixtures import (
 )
 from fixtures.remote_storage import s3_storage
 
+if TYPE_CHECKING:
+    from typing import Optional
+
+    from fixtures.neon_fixtures import PgBin
+    from pytest import CaptureFixture
+
 
 # Run the main PostgreSQL regression tests, in src/test/regress.
 #
@@ -19,8 +27,8 @@ def test_pg_regress(
     neon_env_builder: NeonEnvBuilder,
     test_output_dir: Path,
     build_type: str,
-    pg_bin,
-    capsys,
+    pg_bin: PgBin,
+    capsys: CaptureFixture[str],
     base_dir: Path,
     pg_distrib_dir: Path,
     shard_count: Optional[int],
@@ -86,8 +94,8 @@ def test_pg_regress(
 def test_isolation(
     neon_env_builder: NeonEnvBuilder,
     test_output_dir: Path,
-    pg_bin,
-    capsys,
+    pg_bin: PgBin,
+    capsys: CaptureFixture[str],
     base_dir: Path,
     pg_distrib_dir: Path,
     shard_count: Optional[int],
@@ -142,8 +150,8 @@ def test_isolation(
 def test_sql_regress(
     neon_env_builder: NeonEnvBuilder,
     test_output_dir: Path,
-    pg_bin,
-    capsys,
+    pg_bin: PgBin,
+    capsys: CaptureFixture[str],
     base_dir: Path,
     pg_distrib_dir: Path,
     shard_count: Optional[int],