diff --git a/requirements/requirements-optionals.txt b/requirements/requirements-optionals.txt
index d38ede9ba..c5be70c3d 100644
--- a/requirements/requirements-optionals.txt
+++ b/requirements/requirements-optionals.txt
@@ -6,4 +6,4 @@ django-guardian==1.5.0
 django-filter>=2.1.0, <2.2
 coreapi==2.3.1
 coreschema==0.0.4
-pyyaml
+pyyaml>=5.1
diff --git a/rest_framework/renderers.py b/rest_framework/renderers.py
index 3dc94ed2d..772ef3c2c 100644
--- a/rest_framework/renderers.py
+++ b/rest_framework/renderers.py
@@ -1049,7 +1049,7 @@ class OpenAPIRenderer(BaseRenderer):
         assert yaml, 'Using OpenAPIRenderer, but `pyyaml` is not installed.'
 
     def render(self, data, media_type=None, renderer_context=None):
-        return yaml.dump(data, default_flow_style=False).encode('utf-8')
+        return yaml.dump(data, default_flow_style=False, sort_keys=False).encode('utf-8')
 
 
 class JSONOpenAPIRenderer(BaseRenderer):