diff --git a/jupyterlab_server/tests/utils.py b/jupyterlab_server/tests/utils.py
index 572e3e02..d4d737d8 100755
--- a/jupyterlab_server/tests/utils.py
+++ b/jupyterlab_server/tests/utils.py
@@ -44,7 +44,7 @@ def wrap_request(request, spec):
     # work around lack of support for path parameters which can contain slashes
     # https://github.com/OAI/OpenAPI-Specification/issues/892
     url = None
-    for path in spec.paths:
+    for path in spec['paths']:
         if url:
             continue
         has_arg = '{' in path
diff --git a/setup.cfg b/setup.cfg
index 10d81031..093025f6 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -38,7 +38,7 @@ install_requires =
 
 
 [options.extras_require]
-test = codecov; ipykernel; pytest>=5.3.2; pytest-cov; jupyter_server[test]; openapi_core~=0.13.8; pytest-console-scripts; strict-rfc3339; ruamel.yaml; wheel
+test = codecov; ipykernel; pytest>=5.3.2; pytest-cov; jupyter_server[test]; openapi_core~=0.14.0; pytest-console-scripts; strict-rfc3339; ruamel.yaml; wheel
 
 [options.packages.find]
 exclude = ['docs*']