diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+1.2.3
+-----
+
+- Require insert-ordered-containers-0.3, swagger2-2.9
+
 1.2.1
 -----
 
diff --git a/servant-swagger.cabal b/servant-swagger.cabal
--- a/servant-swagger.cabal
+++ b/servant-swagger.cabal
@@ -1,6 +1,6 @@
 cabal-version:       2.2
 name:                servant-swagger
-version:             1.2.2
+version:             1.2.3
 synopsis:            Generate a Swagger/OpenAPI/OAS 2.0 specification for your servant API.
 description:
   Swagger is a project used to describe and document RESTful APIs. The core of the
@@ -77,7 +77,7 @@
                      , http-media                >=0.7.1.3  && <0.9
                      , insert-ordered-containers >=0.3      && <0.4
                      , lens                      >=4.17     && <6
-                     , servant                   >=0.20.2   && <0.21
+                     , servant                   >=0.20.3   && <0.21
                      , singleton-bool            >=0.1.4    && <0.2
                      , swagger2                  >=2.9      && <2.10
                      , text                      >=1.2.3.0  && <2.2
diff --git a/src/Servant/Swagger/Internal.hs b/src/Servant/Swagger/Internal.hs
--- a/src/Servant/Swagger/Internal.hs
+++ b/src/Servant/Swagger/Internal.hs
@@ -389,10 +389,12 @@
     toSwagger (Proxy :: Proxy api)
       & allOperations . summary %~ (Just (Text.pack (symbolVal (Proxy :: Proxy desc))) <>)
 
+#if MIN_VERSION_servant(0,20,4)
 instance (HasSwagger api, KnownSymbol operationId) => HasSwagger (OperationId operationId :> api) where
   toSwagger _ =
     toSwagger (Proxy :: Proxy api)
       & allOperations . operationId %~ (Just (Text.pack (symbolVal (Proxy :: Proxy operationId))) <>)
+#endif
 
 instance (HasSwagger sub, KnownSymbol (FoldDescription mods), KnownSymbol sym, SBoolI (FoldRequired mods), ToParamSchema a) => HasSwagger (QueryParam' mods sym a :> sub) where
   toSwagger _ =
@@ -431,11 +433,7 @@
           & paramSchema .~ pschema
 
       pschemaItems = SwaggerItemsPrimitive (Just CollectionMulti) (toParamSchema (Proxy :: Proxy a))
-#if MIN_VERSION_swagger2(2,4,0)
       pschema = mempty & type_ ?~ SwaggerArray & items ?~ pschemaItems
-#else
-      pschema = mempty & type_ .~ SwaggerArray & items ?~ pschemaItems
-#endif
 
 instance (HasSwagger sub, KnownSymbol sym) => HasSwagger (QueryFlag sym :> sub) where
   toSwagger _ =