diff --git a/lsp-types.cabal b/lsp-types.cabal
--- a/lsp-types.cabal
+++ b/lsp-types.cabal
@@ -1,5 +1,5 @@
 name:                lsp-types
-version:             1.0.0.0
+version:             1.0.0.1
 synopsis:            Haskell library for the Microsoft Language Server Protocol, data types
 
 description:         An implementation of the types to allow language implementors to
@@ -67,7 +67,7 @@
                      , Language.LSP.Types.WorkspaceSymbol
  -- other-extensions:
   ghc-options:         -Wall
-  build-depends:       base >= 4.9 && < 4.15
+  build-depends:       base >= 4.11 && < 4.15
                      , aeson >=1.2.2.0
                      , binary
                      , bytestring
diff --git a/src/Language/LSP/VFS.hs b/src/Language/LSP/VFS.hs
--- a/src/Language/LSP/VFS.hs
+++ b/src/Language/LSP/VFS.hs
@@ -5,7 +5,7 @@
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE ViewPatterns #-}
 {-# LANGUAGE NamedFieldPuns #-}
-{-# LANGUAGE DataKinds #-}
+{-# LANGUAGE TypeInType #-}
 
 {-|
 Handles the "Language.LSP.Types.TextDocumentDidChange" \/