diff --git a/scripts/versionbump.py b/scripts/versionbump.py
index e7584f3e4..e81b10d95 100755
--- a/scripts/versionbump.py
+++ b/scripts/versionbump.py
@@ -5,10 +5,28 @@ import datetime
 import re
 import subprocess
 import sys
-
+import tempfile
+import filecmp
 from packaging import version
 
 
+def check_cog_pyproject():
+    with tempfile.NamedTemporaryFile(mode='w+', delete=False) as temp_file:
+        with open('pyproject.toml', 'r') as original_file:
+            temp_file.write(original_file.read())
+    
+    result = subprocess.run(["cog", "-r", "pyproject.toml"], capture_output=True, text=True)
+    
+    if result.returncode != 0:
+        print("Error: cog -r pyproject.toml failed with the following output:")
+        print(result.stderr)
+        sys.exit(1)
+    
+    if not filecmp.cmp('pyproject.toml', temp_file.name):
+        print("Error: cog -r pyproject.toml has changed the file. Please run cog -r pyproject.toml and commit the changes.")
+        sys.exit(1)
+
+
 def main():
     parser = argparse.ArgumentParser(description="Bump version")
     parser.add_argument("new_version", help="New version in x.y.z format")
@@ -56,6 +74,7 @@ def main():
     check_branch()
     check_working_directory_clean()
     check_main_branch_up_to_date()
+    check_cog_pyproject()
 
     new_version_str = args.new_version
     if not re.match(r"^\d+\.\d+\.\d+$", new_version_str):