diff --git a/.github/workflows/api-documentation.yml b/.github/workflows/api-documentation.yml
index 80a3c1e3a..5e9337c5f 100644
--- a/.github/workflows/api-documentation.yml
+++ b/.github/workflows/api-documentation.yml
@@ -18,17 +18,15 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python-version: [2.7]
+        python-version: [3.12]
     steps:
       - uses: actions/checkout@v4
 
       - name: Set up Python
-        # setup-python stopped supporting Python 2.7, use https://github.com/MatteoH2O1999/setup-python
-        uses: MatteoH2O1999/setup-python@v3.2.1
+        uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
-          allow-build: info
-          cache-build: true
+          architecture: x64
 
       - name: Install dependencies
         run: |
diff --git a/tools/api/generate-openapi.py b/tools/api/generate-openapi.py
index b922b86e1..672a8991e 100755
--- a/tools/api/generate-openapi.py
+++ b/tools/api/generate-openapi.py
@@ -12,24 +12,23 @@
 This module imports (and therefore executes) ruleset code.
 Do not run it on untrusted codebases.
 """
-from __future__ import print_function
 
 __copyright__ = 'Copyright (c) 2020-2024, Utrecht University'
 __license__   = 'GPLv3, see LICENSE'
 
-__author__    =  ('Chris Smeele')
-__author__    =  ('Lazlo Westerhof')
+__author__    = ('Chris Smeele')
+__author__    = ('Lazlo Westerhof')
 # (in alphabetical order)
 
-import sys
-import re
+import argparse
 import inspect
 import json
-
-from importlib import import_module
+import re
+import sys
 from collections import OrderedDict
+from importlib import import_module
 
-import argparse
+sys.path.extend(['./rules_uu', './rules_uu/util'])
 
 parser = argparse.ArgumentParser(description=__doc__)
 parser.add_argument('ruleset', metavar='RULESET', type=str,
@@ -44,6 +43,7 @@
 core = args.core
 module = args.module
 
+
 # Strategy: Import the requested ruleset with an instrumented environment, and
 # apply introspection to extract API function information.
 
@@ -55,9 +55,15 @@ class Sandbag(object):
     Used as a stub for various internal irods modules so that we can import
     rulesets without errors.
     """
-    def __init__(self, *_, **kw): self._data = kw
-    def __call__(self, *_, **__): return Sandbag()
-    def __getattr__(self, k):     return self._data.get(k, Sandbag())
+    def __init__(self, *_, **kw):
+        self._data = kw
+
+    def __call__(self, *_, **__):
+        return Sandbag()
+
+    def __getattr__(self, k):
+        return self._data.get(k, Sandbag())
+
     def __setattr__(self, k, v):
         if k == '_data':
             return super(Sandbag, self).__setattr__(k, v)
@@ -80,6 +86,7 @@ def f(g):
             return g
         return f
 
+
 # Inject iRODS modules.
 sys.modules['irods_types']       = Sandbag()
 sys.modules['genquery']          = Sandbag()