diff --git a/index.js b/index.js
index dd1f690..f1e7c3b 100644
--- a/index.js
+++ b/index.js
@@ -139,10 +139,41 @@ function filter(obj,options) {
         if (options.servers && !filtered.servers && Array.isArray(src.servers)) {
             filtered.servers = src.servers;
         }
+
+        const activeSecuritySchemes=
+            (src.paths?Object.keys(src.paths):[])
+                .flatMap(pathUrl =>src.paths[pathUrl])
+                .flatMap(pathElement => Object.keys(pathElement)
+                .flatMap(method =>pathElement[method]))
+                .filter(path => Object.keys(path).filter(value => options.flags.includes(value)))
+                .flatMap(path =>{
+                    if (!filtered.security && Array.isArray(path.security)) {
+                        return path.security.flatMap(securityItem => Object.keys(securityItem));
+                    } else {
+                        return [];
+                    }
+                })
+                .filter(filterUnique)
+
+        // OAS2
+        if (src.securityDefinitions) {
+            filtered.securityDefinitions = Object.fromEntries(Object.entries(src.securityDefinitions).filter(([key]) => activeSecuritySchemes.includes(key)));
+        }
+        // OAS3
+        if (src.components && src.components.securitySchemes) {
+            if (!filtered.components){
+                filtered.components ={};
+            }
+            filtered.components.securitySchemes = Object.fromEntries(Object.entries(src.components.securitySchemes).filter(([key]) => activeSecuritySchemes.includes(key)));
+        }
     }
     return (options.inverse ? filtered : src);
 }
 
+function filterUnique(value, index, array) {
+    return array.indexOf(value) === index;
+}
+
 module.exports = {
     filter : filter
 };
diff --git a/test/asyncapi/output.yaml b/test/asyncapi/output.yaml
index 278b4f1..7f61c55 100644
--- a/test/asyncapi/output.yaml
+++ b/test/asyncapi/output.yaml
@@ -58,3 +58,4 @@ components:
       type: string
       format: date-time
       description: Date and time when the message was sent.
+  securitySchemes: {}
diff --git a/test/checkTags1/output.yaml b/test/checkTags1/output.yaml
index 6eaae1d..976494e 100644
--- a/test/checkTags1/output.yaml
+++ b/test/checkTags1/output.yaml
@@ -9,7 +9,10 @@ x-origin:
       url: https://github.com/mermade/swagger2openapi
       version: 2.6.3
 info:
-  description: "This is a sample server Petstore server.  You can find out more about Swagger at [http://swagger.io](http://swagger.io) or on [irc.freenode.net, #swagger](http://swagger.io/irc/).  For this sample, you can use the api key `special-key` to test the authorization filters."
+  description: "This is a sample server Petstore server.  You can find out more
+    about Swagger at [http://swagger.io](http://swagger.io) or on
+    [irc.freenode.net, #swagger](http://swagger.io/irc/).  For this sample, you
+    can use the api key `special-key` to test the authorization filters."
   version: 1.0.0
   title: Swagger Petstore
   termsOfService: http://swagger.io/terms/
@@ -114,7 +117,8 @@ paths:
       tags:
         - pet
       summary: Finds Pets by tags
-      description: Muliple tags can be provided with comma separated strings. Use tag1, tag2, tag3 for testing.
+      description: Muliple tags can be provided with comma separated strings. Use
+        tag1, tag2, tag3 for testing.
       operationId: findPetsByTags
       parameters:
         - name: tags
@@ -321,7 +325,8 @@ paths:
       tags:
         - store
       summary: Find purchase order by ID
-      description: For valid response try integer IDs with value >= 1 and <= 10. Other values will generated exceptions
+      description: For valid response try integer IDs with value >= 1 and <= 10. Other
+        values will generated exceptions
       operationId: getOrderById
       parameters:
         - name: orderId
@@ -351,7 +356,8 @@ paths:
       tags:
         - store
       summary: Delete purchase order by ID
-      description: For valid response try integer IDs with positive integer value. Negative or non-integer values will generate API errors
+      description: For valid response try integer IDs with positive integer value.
+        Negative or non-integer values will generate API errors
       operationId: deleteOrder
       parameters:
         - name: orderId
diff --git a/test/checkTags2/output.yaml b/test/checkTags2/output.yaml
index 65c19cb..b38750c 100644
--- a/test/checkTags2/output.yaml
+++ b/test/checkTags2/output.yaml
@@ -205,3 +205,16 @@ components:
               $ref: "#/components/schemas/User"
       description: List of user object
       required: true
+  securitySchemes:
+    petstore_auth:
+      type: oauth2
+      flows:
+        implicit:
+          authorizationUrl: http://petstore.swagger.io/oauth/dialog
+          scopes:
+            write:pets: modify pets in your account
+            read:pets: read your pets
+    api_key:
+      type: apiKey
+      name: api_key
+      in: header
diff --git a/test/circular/output.yaml b/test/circular/output.yaml
index 08e90bc..5e14124 100644
--- a/test/circular/output.yaml
+++ b/test/circular/output.yaml
@@ -7,14 +7,14 @@ paths:
   "/{comicId}/info.0.json":
     x-internal: true
     get:
-      description: >
+      description: |
         Fetch comics and metadata by comic id.
       parameters:
         - in: path
           name: comicId
           required: true
           type: number
-        - $ref: '#/definitions/complex'
+        - $ref: "#/definitions/complex"
         - $ref: "#/definitions/hovertext"
       responses:
         "200":
@@ -27,6 +27,13 @@ definitions:
     properties:
       description:
         type: string
+  complex:
+    properties:
+      a69:
+        type: object
+        oneOf:
+          - $ref: "#/definitions/b1"
+          - $ref: "#/definitions/b2"
   comic:
     properties:
       alt:
@@ -52,15 +59,8 @@ definitions:
       year:
         type: string
       previous:
-        $ref: '#/definitions/comic'
+        $ref: "#/definitions/comic"
     type: object
-  complex:
-    properties:
-      a69:
-        type: object
-        oneOf:
-          - $ref: '#/definitions/b1'
-          - $ref: '#/definitions/b2'
   b1:
     properties:
       ab:
@@ -70,8 +70,9 @@ definitions:
       ac:
         type: object
         oneOf:
-          - $ref: '#/definitions/c1'
+          - $ref: "#/definitions/c1"
   c1:
     properties:
       ab:
         type: string
+securityDefinitions: {}
diff --git a/test/codep/output.yaml b/test/codep/output.yaml
index 3017f9d..60ded0f 100644
--- a/test/codep/output.yaml
+++ b/test/codep/output.yaml
@@ -7,14 +7,14 @@ paths:
   "/{comicId}/info.0.json":
     x-internal: true
     get:
-      description: >
+      description: |
         Fetch comics and metadata by comic id.
       parameters:
         - in: path
           name: comicId
           required: true
           type: number
-        - $ref: '#/definitions/complex'
+        - $ref: "#/definitions/complex"
         - $ref: "#/definitions/hovertext"
       responses:
         "200":
@@ -27,6 +27,13 @@ definitions:
     properties:
       description:
         type: string
+  complex:
+    properties:
+      a69:
+        type: object
+        oneOf:
+          - $ref: "#/definitions/b1"
+          - $ref: "#/definitions/b2"
   comic:
     properties:
       alt:
@@ -52,20 +59,8 @@ definitions:
       year:
         type: string
       previous:
-        $ref: '#/definitions/other'
+        $ref: "#/definitions/other"
     type: object
-  other:
-    type: object
-    properties:
-      comic:
-        $ref: '#/definitions/comic'
-  complex:
-    properties:
-      a69:
-        type: object
-        oneOf:
-          - $ref: '#/definitions/b1'
-          - $ref: '#/definitions/b2'
   b1:
     properties:
       ab:
@@ -75,8 +70,14 @@ definitions:
       ac:
         type: object
         oneOf:
-          - $ref: '#/definitions/c1'
+          - $ref: "#/definitions/c1"
+  other:
+    type: object
+    properties:
+      comic:
+        $ref: "#/definitions/comic"
   c1:
     properties:
       ab:
         type: string
+securityDefinitions: {}
diff --git a/test/configFile/output.yaml b/test/configFile/output.yaml
index df8d6ae..948fb1f 100644
--- a/test/configFile/output.yaml
+++ b/test/configFile/output.yaml
@@ -25,7 +25,7 @@ paths:
   /info.0.json:
     x-visibility: public
     get:
-      description: >
+      description: |
         Fetch current comic and metadata.
       parameters:
         - $ref: "#/definitions/comic"
diff --git a/test/issue105a/output.yaml b/test/issue105a/output.yaml
index 5af3474..1437a1e 100644
--- a/test/issue105a/output.yaml
+++ b/test/issue105a/output.yaml
@@ -7,7 +7,7 @@ components:
     ok:
       description: OK
       content:
-        'application/json':
+        application/json:
           schema:
             type: object
             properties:
diff --git a/test/issue26a/output.yaml b/test/issue26a/output.yaml
index 37d3be1..8e45e90 100644
--- a/test/issue26a/output.yaml
+++ b/test/issue26a/output.yaml
@@ -3,6 +3,6 @@ info:
   title: API
   version: 1.0.0
 tags:
-  - "x-public": true
+  - x-public: true
     name: Tag 2
 paths: {}
diff --git a/test/issue26b/output.yaml b/test/issue26b/output.yaml
index 9a2434a..0c69c03 100644
--- a/test/issue26b/output.yaml
+++ b/test/issue26b/output.yaml
@@ -3,6 +3,6 @@ info:
   title: API
   version: 1.0.0
 tags:
-  - "x-public": true
-    name: Tag 1
+  - name: Tag 1
+    x-public: true
 paths: {}
diff --git a/test/issue29_nestedReferences/output.yaml b/test/issue29_nestedReferences/output.yaml
index d82186f..ac19a8e 100644
--- a/test/issue29_nestedReferences/output.yaml
+++ b/test/issue29_nestedReferences/output.yaml
@@ -7,14 +7,14 @@ paths:
   "/{comicId}/info.0.json":
     x-internal: true
     get:
-      description: >
+      description: |
         Fetch comics and metadata by comic id.
       parameters:
         - in: path
           name: comicId
           required: true
           type: number
-        - $ref: '#/definitions/complex'
+        - $ref: "#/definitions/complex"
         - $ref: "#/definitions/hovertext"
       responses:
         "200":
@@ -27,6 +27,13 @@ definitions:
     properties:
       description:
         type: string
+  complex:
+    properties:
+      a69:
+        type: object
+        oneOf:
+          - $ref: "#/definitions/b1"
+          - $ref: "#/definitions/b2"
   comic:
     properties:
       alt:
@@ -52,13 +59,6 @@ definitions:
       year:
         type: string
     type: object
-  complex:
-    properties:
-      a69:
-        type: object
-        oneOf:
-          - $ref: '#/definitions/b1'
-          - $ref: '#/definitions/b2'
   b1:
     properties:
       ab:
@@ -68,8 +68,9 @@ definitions:
       ac:
         type: object
         oneOf:
-          - $ref: '#/definitions/c1'
+          - $ref: "#/definitions/c1"
   c1:
     properties:
       ab:
-        type: string
\ No newline at end of file
+        type: string
+securityDefinitions: {}
diff --git a/test/issue85/output.yaml b/test/issue85/output.yaml
index 80b447a..e270216 100644
--- a/test/issue85/output.yaml
+++ b/test/issue85/output.yaml
@@ -6,8 +6,7 @@ paths:
   /test:
     post:
       parameters:
-        - $ref: '#/components/parameters/ExternalHeader'
-
+        - $ref: "#/components/parameters/ExternalHeader"
 components:
   parameters:
     ExternalHeader:
diff --git a/test/valid/output.yaml b/test/valid/output.yaml
index 2fa0d59..f0af1fa 100644
--- a/test/valid/output.yaml
+++ b/test/valid/output.yaml
@@ -7,7 +7,7 @@ paths:
   "/{comicId}/info.0.json":
     x-internal: true
     get:
-      description: >
+      description: |
         Fetch comics and metadata by comic id.
       parameters:
         - in: path
@@ -51,3 +51,4 @@ definitions:
       year:
         type: string
     type: object
+securityDefinitions: {}