diff --git a/json-to-type.cabal b/json-to-type.cabal
--- a/json-to-type.cabal
+++ b/json-to-type.cabal
@@ -5,7 +5,7 @@
 -- see: https://github.com/sol/hpack
 
 name:                json-to-type
-version:             4.0.0
+version:             4.0.1
 synopsis:            Automatic type declaration for JSON input data
 description:         Generates datatype declarations with Aeson''s ''Data.Aeson.FromJSON''
                      .
@@ -40,10 +40,10 @@
                      .
                      (If you want your favourite programming language supported too —
                      .
-                     name your price and mail the author.)
+                     name your price and mail the maintainer.)
                      .
                      .
-                     See introduction on <https://github.com/mgajda/json-to-type> for details.'
+                     See introduction on <https://github.com/jappeace/json-to-type> for details.'
                      .
 homepage:            https://github.com/jappeace/json-to-type.git#readme
 license:             BSD-3-Clause
@@ -52,6 +52,7 @@
 author:              Michal J. Gajda
 maintainer:          simons@cryp.to,
                      mjgajda@gmail.com
+                     hi@jappie.me
 copyright:           Copyright by Migamake '2014-'2020
 category:            Data, Tools
 build-type:          Simple
diff --git a/test/gen/GenerateTestJSON.hs b/test/gen/GenerateTestJSON.hs
--- a/test/gen/GenerateTestJSON.hs
+++ b/test/gen/GenerateTestJSON.hs
@@ -15,7 +15,7 @@
 import           System.FilePath           (splitExtension, (<.>), (</>))
 import           System.Directory          (removeFile, createDirectoryIfMissing)
 import           System.Process            (system)
-import           Control.Monad             (forM_, forM, when)
+import           Control.Monad             (forM_, forM, when, filterM)
 import           Control.Exception         (assert)
 import qualified Data.ByteString.Lazy.Char8 as BSL
 import qualified Data.HashMap.Strict        as Map