diff --git a/vdirsyncer/cli/fetchparams.py b/vdirsyncer/cli/fetchparams.py
index 2ef6c4f..7952bc6 100644
--- a/vdirsyncer/cli/fetchparams.py
+++ b/vdirsyncer/cli/fetchparams.py
@@ -82,9 +82,7 @@ def _strategy_command(*command: str, shell: bool = False):
     expanded_command = list(map(expand_path, command))
 
     try:
-        stdout = subprocess.check_output(
-            expanded_command, universal_newlines=True, shell=shell
-        )
+        stdout = subprocess.check_output(expanded_command, text=True, shell=shell)
         return stdout.strip("\n")
     except OSError as e:
         cmd = " ".join(expanded_command)