diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 9392beef..b2bc0bf1 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -16,7 +16,7 @@ jobs:
       matrix:
         # macos-13 is the last intel based runner
         os: [ubuntu-latest, macos-13, macos-latest, windows-latest]
-        python-version: ['3.9', '3.10', '3.11', '3.12']
+        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13']
     defaults:
       run:
         shell: bash -el {0}
diff --git a/opty-dev-env.yml b/opty-dev-env.yml
index cfd64422..e2e073a0 100644
--- a/opty-dev-env.yml
+++ b/opty-dev-env.yml
@@ -11,6 +11,7 @@ dependencies:
   - numpydoc
   - pytest
   - pytest-cov
+  - python
   - scipy >=1.5.0
   - sphinx
   - sphinx-gallery
diff --git a/opty/direct_collocation.py b/opty/direct_collocation.py
index 90783a50..67175244 100644
--- a/opty/direct_collocation.py
+++ b/opty/direct_collocation.py
@@ -1,5 +1,6 @@
 #!/usr/bin/env python
-#
+
+import sys
 from functools import wraps
 import logging
 
@@ -77,7 +78,11 @@ def use_parent_doc(self, func, source):
     @staticmethod
     def _combine_docs(prob_doc, coll_doc):
         beg, end = prob_doc.split('bounds')
-        _, middle = coll_doc.split('Parameters\n        ==========\n        ')
+        if sys.version_info[1] >= 13:
+            sep = 'Parameters\n==========\n'
+        else:
+            sep = 'Parameters\n        ==========\n        '
+        _, middle = coll_doc.split(sep)
         return beg + middle[:-9] + '        bounds' + end
 
 _doc_inherit = _DocInherit