diff --git a/tests/tsa_server.py b/tests/tsa_server.py
index a1c3b39..b8da5aa 100644
--- a/tests/tsa_server.py
+++ b/tests/tsa_server.py
@@ -133,7 +133,7 @@ def main() -> None:
     hostname, port = server.start_server()
     program.append(f"{hostname}:{port}")
     try:
-        osslsigncode = subprocess.run(program, check=True, text=True)
+        osslsigncode = subprocess.run(program, check=True, universal_newlines=True)
         osslsigncode.check_returncode()
     except subprocess.CalledProcessError as err:
         ret = err.returncode