diff --git a/src/WebGear/OpenApi/Handler.hs b/src/WebGear/OpenApi/Handler.hs
--- a/src/WebGear/OpenApi/Handler.hs
+++ b/src/WebGear/OpenApi/Handler.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 {- | An implementation of `Handler` to generate `OpenApi` documentation
  from WebGear API specifications.
 -}
@@ -262,8 +263,13 @@
 
 mergeDoc :: CompactDocNode -> Tree CompactDocNode -> OpenApi -> OpenApi
 mergeDoc (CDocSecurityScheme schemeName scheme) child doc =
-  let secSchemes = [(schemeName, scheme)] :: Definitions SecurityScheme
-      secReqs = [SecurityRequirement [(schemeName, [])]] :: [SecurityRequirement]
+  let
+#if MIN_VERSION_openapi3(3, 2, 0)
+    secSchemes = SecurityDefinitions [(schemeName, scheme)]
+#else
+    secSchemes = [(schemeName, scheme)] :: Definitions SecurityScheme
+#endif
+    secReqs = [SecurityRequirement [(schemeName, [])]] :: [SecurityRequirement]
    in postOrder child doc $ \doc' ->
         doc'
           & components . securitySchemes <>~ secSchemes
diff --git a/webgear-openapi.cabal b/webgear-openapi.cabal
--- a/webgear-openapi.cabal
+++ b/webgear-openapi.cabal
@@ -1,7 +1,7 @@
 cabal-version:       2.4
 
 name:                webgear-openapi
-version:             1.0.0
+version:             1.0.1
 synopsis:            Composable, type-safe library to build HTTP API servers
 description:
     WebGear is a library to for building composable, type-safe HTTP API servers.
@@ -72,9 +72,9 @@
                     , http-types ==0.12.*
                     , insert-ordered-containers ==0.2.*
                     , lens >=4.18.1 && <5.2
-                    , openapi3 ==3.1.*
-                    , text ==1.2.*
-                    , webgear-core ==1.0.0
+                    , openapi3 >=3.1.0 && <3.3
+                    , text >=1.2.0.0 && <2.1
+                    , webgear-core ==1.0.1
   ghc-options:        -Wall
                       -Wno-unticked-promoted-constructors
                       -Wcompat