diff --git a/servant-swagger-tags.cabal b/servant-swagger-tags.cabal
--- a/servant-swagger-tags.cabal
+++ b/servant-swagger-tags.cabal
@@ -1,5 +1,5 @@
 name:                servant-swagger-tags
-version:             0.1.0.0
+version:             0.1.0.1
 synopsis:            Swagger Tags for Servant
 -- description:         Swagger Tags for Servant
 homepage:            https://github.com/nakaji-dayo/servant-swagger-tags#readme
@@ -23,8 +23,8 @@
                      , servant-mock
                      , swagger2
                      , text
-                     , containers
                      , lens
+                     , insert-ordered-containers
   default-language:    Haskell2010
 
 source-repository head
diff --git a/src/Servant/Swagger/Tags.hs b/src/Servant/Swagger/Tags.hs
--- a/src/Servant/Swagger/Tags.hs
+++ b/src/Servant/Swagger/Tags.hs
@@ -10,12 +10,12 @@
 module Servant.Swagger.Tags where
 
 import           Control.Lens
-import qualified Data.Set        as S
+import           Data.HashSet.InsOrd
 import           Data.Swagger
-import qualified Data.Text       as Text
-import           Data.Typeable   (Typeable)
-import           GHC.TypeLits    (KnownSymbol, Symbol, symbolVal)
-import           Servant         hiding (Context)
+import           Data.Text
+import           Data.Typeable       (Typeable)
+import           GHC.TypeLits        (KnownSymbol, Symbol, symbolVal)
+import           Servant             hiding (Context)
 import           Servant.Mock
 import           Servant.Swagger
 
@@ -29,7 +29,7 @@
 
 instance (KnownSymbol tags, HasSwagger api) => HasSwagger (Tags tags :> api) where
   toSwagger _ = toSwagger (Proxy :: Proxy api)
-    & allOperations.tags %~ S.union (S.fromList [Text.pack (symbolVal (Proxy :: Proxy tags))])
+    & allOperations.tags %~ union (fromList [pack (symbolVal (Proxy :: Proxy tags))])
 
 instance HasMock api context => HasMock (Tags t :> api) context where
     mock _ = mock (Proxy :: Proxy api)