diff --git a/example/example.cabal b/example/example.cabal
--- a/example/example.cabal
+++ b/example/example.cabal
@@ -16,7 +16,8 @@
 tested-with:
   GHC ==8.4.4
    || ==8.6.5
-   || ==8.8.3
+   || ==8.8.4
+   || ==8.10.2
 
 library
   ghc-options:      -Wall
diff --git a/servant-openapi3.cabal b/servant-openapi3.cabal
--- a/servant-openapi3.cabal
+++ b/servant-openapi3.cabal
@@ -1,5 +1,5 @@
 name:                servant-openapi3
-version:             2.0.0.1
+version:             2.0.1.0
 synopsis:            Generate a Swagger/OpenAPI/OAS 3.0 specification for your servant API.
 description:
   Swagger is a project used to describe and document RESTful APIs. The core of the 
@@ -31,7 +31,8 @@
 tested-with:
   GHC ==8.4.4
    || ==8.6.5
-   || ==8.8.3
+   || ==8.8.4
+   || ==8.10.2
 
 extra-source-files:
     README.md
diff --git a/src/Servant/OpenApi/Internal.hs b/src/Servant/OpenApi/Internal.hs
--- a/src/Servant/OpenApi/Internal.hs
+++ b/src/Servant/OpenApi/Internal.hs
@@ -11,11 +11,15 @@
 #if __GLASGOW_HASKELL__ >= 806
 {-# LANGUAGE UndecidableInstances #-}
 #endif
+{-# OPTIONS_GHC -Wno-orphans #-}
 module Servant.OpenApi.Internal where
 
 import Prelude ()
 import Prelude.Compat
 
+#if MIN_VERSION_servant(0,18,1)
+import           Control.Applicative                    ((<|>))
+#endif
 import           Control.Lens
 import           Data.Aeson
 import           Data.Foldable              (toList)
@@ -182,6 +186,57 @@
 instance OpenApiMethod 'OPTIONS where openApiMethod _ = options
 instance OpenApiMethod 'HEAD    where openApiMethod _ = head_
 instance OpenApiMethod 'PATCH   where openApiMethod _ = patch
+
+#if MIN_VERSION_servant(0,18,1)
+instance HasOpenApi (UVerb method cs '[]) where
+  toOpenApi _ = mempty
+
+-- | @since <2.0.1.0>
+instance
+  {-# OVERLAPPABLE #-}
+  ( ToSchema a,
+    HasStatus a,
+    AllAccept cs,
+    OpenApiMethod method,
+    HasOpenApi (UVerb method cs as)
+  ) =>
+  HasOpenApi (UVerb method cs (a ': as))
+  where
+  toOpenApi _ =
+    toOpenApi (Proxy :: Proxy (Verb method (StatusOf a) cs a))
+      `combineSwagger` toOpenApi (Proxy :: Proxy (UVerb method cs as))
+    where
+      -- workaround for https://github.com/GetShopTV/swagger2/issues/218
+      combinePathItem :: PathItem -> PathItem -> PathItem
+      combinePathItem s t = PathItem
+        { _pathItemGet = _pathItemGet s <> _pathItemGet t
+        , _pathItemPut = _pathItemPut s <> _pathItemPut t
+        , _pathItemPost = _pathItemPost s <> _pathItemPost t
+        , _pathItemDelete = _pathItemDelete s <> _pathItemDelete t
+        , _pathItemOptions = _pathItemOptions s <> _pathItemOptions t
+        , _pathItemHead = _pathItemHead s <> _pathItemHead t
+        , _pathItemPatch = _pathItemPatch s <> _pathItemPatch t
+        , _pathItemTrace = _pathItemTrace s <> _pathItemTrace t
+        , _pathItemParameters = _pathItemParameters s <> _pathItemParameters t
+        , _pathItemSummary = _pathItemSummary s <|> _pathItemSummary t
+        , _pathItemDescription = _pathItemDescription s <|> _pathItemDescription t
+        , _pathItemServers = _pathItemServers s <> _pathItemServers t
+        }
+
+      combineSwagger :: OpenApi -> OpenApi -> OpenApi
+      combineSwagger s t = OpenApi
+        { _openApiInfo = _openApiInfo s <> _openApiInfo t
+        , _openApiServers = _openApiServers s <> _openApiServers t
+        , _openApiPaths = InsOrdHashMap.unionWith combinePathItem (_openApiPaths s) (_openApiPaths t)
+        , _openApiComponents = _openApiComponents s <> _openApiComponents t
+        , _openApiSecurity = _openApiSecurity s <> _openApiSecurity t
+        , _openApiTags = _openApiTags s <> _openApiTags t
+        , _openApiExternalDocs = _openApiExternalDocs s <|> _openApiExternalDocs t
+        }
+
+instance ToSchema a => ToSchema (WithStatus s a) where
+  declareNamedSchema _ = declareNamedSchema (Proxy :: Proxy a)
+#endif
 
 instance {-# OVERLAPPABLE #-} (ToSchema a, AllAccept cs, KnownNat status, OpenApiMethod method) => HasOpenApi (Verb method status cs a) where
   toOpenApi _ = toOpenApi (Proxy :: Proxy (Verb method status cs (Headers '[] a)))
diff --git a/test/Servant/OpenApiSpec.hs b/test/Servant/OpenApiSpec.hs
--- a/test/Servant/OpenApiSpec.hs
+++ b/test/Servant/OpenApiSpec.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP                #-}
 {-# LANGUAGE DataKinds          #-}
 {-# LANGUAGE DeriveDataTypeable #-}
 {-# LANGUAGE DeriveGeneric      #-}
@@ -5,6 +6,9 @@
 {-# LANGUAGE QuasiQuotes        #-}
 {-# LANGUAGE TypeOperators      #-}
 {-# LANGUAGE PackageImports     #-}
+#if MIN_VERSION_servant(0,18,1)
+{-# LANGUAGE TypeFamilies       #-}
+#endif
 module Servant.OpenApiSpec where
 
 import           Control.Lens
@@ -37,6 +41,9 @@
   it "Comprehensive API" $ do
     let _x = toOpenApi comprehensiveAPI
     True `shouldBe` True -- type-level test
+#if MIN_VERSION_servant(0,18,1)
+  it "UVerb API" $ checkOpenApi uverbOpenApi uverbAPI
+#endif
 
 main :: IO ()
 main = hspec spec
@@ -418,3 +425,105 @@
 }
 |]
 
+-- =======================================================================
+-- UVerb API
+-- =======================================================================
+
+#if MIN_VERSION_servant(0,18,1)
+
+data FisxUser = FisxUser {name :: String}
+  deriving (Eq, Show, Generic)
+
+instance ToSchema FisxUser
+
+instance HasStatus FisxUser where
+  type StatusOf FisxUser = 203
+
+data ArianUser = ArianUser
+  deriving (Eq, Show, Generic)
+
+instance ToSchema ArianUser
+
+type UVerbAPI = "fisx" :> UVerb 'GET '[JSON] '[FisxUser, WithStatus 303 String]
+           :<|> "arian" :> UVerb 'POST '[JSON] '[WithStatus 201 ArianUser]
+
+uverbOpenApi :: OpenApi
+uverbOpenApi = toOpenApi (Proxy :: Proxy UVerbAPI)
+
+uverbAPI :: Value
+uverbAPI = [aesonQQ|
+{
+  "openapi": "3.0.0",
+  "info": {
+    "version": "",
+    "title": ""
+  },
+  "components": {
+    "schemas": {
+      "ArianUser": {
+        "type": "string",
+        "enum": [
+          "ArianUser"
+        ]
+      },
+      "FisxUser": {
+        "required": [
+          "name"
+        ],
+        "type": "object",
+        "properties": {
+          "name": {
+            "type": "string"
+          }
+        }
+      }
+    }
+  },
+  "paths": {
+    "/arian": {
+      "post": {
+        "responses": {
+          "201": {
+            "content": {
+              "application/json;charset=utf-8": {
+                "schema": {
+                  "$ref": "#/components/schemas/ArianUser"
+                }
+              }
+            },
+            "description": ""
+          }
+        }
+      }
+    },
+    "/fisx": {
+      "get": {
+        "responses": {
+          "303": {
+            "content": {
+              "application/json;charset=utf-8": {
+                "schema": {
+                  "type": "string"
+                }
+              }
+            },
+            "description": ""
+          },
+          "203": {
+            "content": {
+              "application/json;charset=utf-8": {
+                "schema": {
+                  "$ref": "#/components/schemas/FisxUser"
+                }
+              }
+            },
+            "description": ""
+          }
+        }
+      }
+    }
+  }
+}
+|]
+
+#endif