diff --git a/docs/changelog.rst b/docs/changelog.rst
index c7cd33f..8bb521f 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -4,12 +4,13 @@ Changelog
 
 
 *********
-**1.7.2**
+**1.7.2b**
 *********
 
 *Release date: May 12, 2018*
 
 - **FIXED:** fixed generation of default ``SECURITY_REQUIREMENTS`` to match documented behaviour
+- **FIXED:** ordering of ``SECURITY_REQUIREMENTS`` and ``SECURITY_DEFINITIONS`` is now stable
 
 
 *********
diff --git a/src/drf_yasg/generators.py b/src/drf_yasg/generators.py
index 0e09c2d..683d300 100644
--- a/src/drf_yasg/generators.py
+++ b/src/drf_yasg/generators.py
@@ -204,9 +204,14 @@ class OpenAPISchemaGenerator(object):
         paths, prefix = self.get_paths(endpoints, components, request, public)
 
         security_definitions = swagger_settings.SECURITY_DEFINITIONS
+        if security_definitions is not None:
+            security_definitions = OrderedDict(sorted([(key, OrderedDict(sorted(sd.items())))
+                                                       for key, sd in swagger_settings.SECURITY_DEFINITIONS.items()]))
         security_requirements = swagger_settings.SECURITY_REQUIREMENTS
         if security_requirements is None:
             security_requirements = [{security_scheme: []} for security_scheme in swagger_settings.SECURITY_DEFINITIONS]
+        else:
+            security_requirements = [OrderedDict(sorted(sr.items())) for sr in security_requirements]
 
         url = self.url
         if url is None and request is not None:
diff --git a/src/drf_yasg/openapi.py b/src/drf_yasg/openapi.py
index da0a9c3..177adb3 100644
--- a/src/drf_yasg/openapi.py
+++ b/src/drf_yasg/openapi.py
@@ -221,7 +221,7 @@ class Swagger(SwaggerDict):
         :param str _prefix: api path prefix to use in setting basePath; this will be appended to the wsgi
             SCRIPT_NAME prefix or Django's FORCE_SCRIPT_NAME if applicable
         :param str _version: version string to override Info
-        :param list[dict] security_definitions: list of supported authentication mechanisms
+        :param dict[str,dict[str,str]] security_definitions: list of supported authentication mechanisms
         :param list[dict] security: authentication mechanisms accepted by default; can be overriden in Operation
         :param list[str] consumes: consumed MIME types; can be overriden in Operation
         :param list[str] produces: produced MIME types; can be overriden in Operation
diff --git a/tests/reference.yaml b/tests/reference.yaml
index 132eacb..f167efc 100644
--- a/tests/reference.yaml
+++ b/tests/reference.yaml
@@ -24,9 +24,9 @@ securityDefinitions:
   Basic:
     type: basic
   Bearer:
-    type: apiKey
-    name: Authorization
     in: header
+    name: Authorization
+    type: apiKey
 security:
   - Basic: []
   - Bearer: []