diff --git a/sphinxcontrib/openapi/openapi31.py b/sphinxcontrib/openapi/openapi31.py
index eb3a7e0..7bc4f06 100644
--- a/sphinxcontrib/openapi/openapi31.py
+++ b/sphinxcontrib/openapi/openapi31.py
@@ -279,7 +279,7 @@ def _httpresource(
 ):
     # https://github.com/OAI/OpenAPI-Specification/blob/3.1.0/versions/3.1.0.md#operation-object
     parameters = properties.get("parameters", [])
-    responses = properties["responses"]
+    responses = properties.get("responses", {})
     query_param_examples = []
     indent = "   "
 
diff --git a/tests/OpenAPI-Specification b/tests/OpenAPI-Specification
index 42a9e3d..69d8b79 160000
--- a/tests/OpenAPI-Specification
+++ b/tests/OpenAPI-Specification
@@ -1 +1 @@
-Subproject commit 42a9e3d4eddade52363a5c4fac852e80681c2fe5
+Subproject commit 69d8b7953c3259e243cf746388a0951b89649763