diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 17f3ccb..fcb9f74 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python: [ "3.8", "3.9", "3.10", "3.11", "3.12" ]
+        python: [ "3.8", "3.9", "3.10", "3.11", "3.12", "3.13" ]
     name: python-${{ matrix.python }}
     steps:
       - name: Checkout
diff --git a/gitup/update.py b/gitup/update.py
index eab5344..d21eb36 100644
--- a/gitup/update.py
+++ b/gitup/update.py
@@ -7,7 +7,6 @@ from __future__ import print_function
 
 from glob import glob
 import os
-import pipes
 import re
 import shlex
 
@@ -85,7 +84,7 @@ def _fetch_remotes(remotes, prune):
             msg = re.sub(r"\s+", " ", err.stderr).strip()
             msg = re.sub(r"^stderr: *'(fatal: *)?", "", msg).strip("'")
             if not msg:
-                command = " ".join(pipes.quote(arg) for arg in err.command)
+                command = " ".join(shlex.quote(arg) for arg in err.command)
                 msg = "{0} failed with status {1}.".format(command, err.status)
             elif not msg.endswith("."):
                 msg += "."