diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,24 @@
 For the latest version of this document, please see
 [https://github.com/DougBurke/hvega/blob/master/ihaskell-hvega/CHANGELOG.md](https://github.com/DougBurke/hvega/blob/master/ihaskell-hvega/CHANGELOG.md).
 
+## 0.2.1.0
+
+THe module now exports the `VegaLiteLab` type (provided by Alexey
+Kuleshevich (lehins). This type is used to support display in Jupyter
+Lab as well as notebooks, and is a somewhat experimental feature.
+
+The module now builds without warnings on GHC 8.8.1.
+
+This release has been marked as compatible with version 0.4 of `hvega`,
+but **care should be taken** as it is possible to create visualizations
+that either do not display correctly, or do not display at all: these
+are visualizations that take advantages of Vega-Lite functionality
+not supported by the Javascript display code (presumably because
+of our use of an old Vega-Lite mimetype version in IHaskell; this
+will hopefuly be addressed once a version of IHaskell is released
+with support for
+[custom mimetypes](https://github.com/gibiansky/IHaskell/issues/1089)).
+
 ## 0.2.0.2
 
 Updated the upper bounds of `ihaskell` to allow version 0.10.
diff --git a/default.nix b/default.nix
--- a/default.nix
+++ b/default.nix
@@ -1,10 +1,2 @@
-{ mkDerivation, aeson, base, hvega, ihaskell, stdenv, text }:
-mkDerivation {
-  pname = "ihaskell-hvega";
-  version = "0.2.0.1";
-  src = ./.;
-  libraryHaskellDepends = [ aeson base hvega ihaskell text ];
-  homepage = "https://github.com/DougBurke/hvega";
-  description = "IHaskell display instance for hvega types";
-  license = stdenv.lib.licenses.bsd3;
-}
+{ nixpkgs ? import <nixpkgs> {}, compiler ? "ghc865" }:
+nixpkgs.pkgs.haskell.packages.${compiler}.callPackage ./ihaskell-hvega.nix { }
diff --git a/ihaskell-hvega.cabal b/ihaskell-hvega.cabal
--- a/ihaskell-hvega.cabal
+++ b/ihaskell-hvega.cabal
@@ -1,5 +1,5 @@
 name:                ihaskell-hvega
-version:             0.2.0.2
+version:             0.2.1.0
 synopsis:            IHaskell display instance for hvega types.
 description:         Support Vega-Lite visualizations in IHaskell notebooks.
 homepage:            https://github.com/DougBurke/hvega
@@ -22,7 +22,7 @@
   exposed-modules:     IHaskell.Display.Hvega
   build-depends:       base >= 4.7 && < 5
                      , aeson >= 0.11 && < 1.5
-                     , hvega < 0.4
+                     , hvega < 0.5
                      , ihaskell >= 0.9.1 && < 0.11
                      , text == 1.2.*
                      
diff --git a/src/IHaskell/Display/Hvega.hs b/src/IHaskell/Display/Hvega.hs
--- a/src/IHaskell/Display/Hvega.hs
+++ b/src/IHaskell/Display/Hvega.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE OverloadedStrings #-}
 
 {-|
@@ -7,7 +8,7 @@
 
 Maintainer  : dburke.gw@gmail.com
 Stability   : unstable
-Portability : OverloadedStrings
+Portability : CPP, OverloadedStrings
 
 Allow VegaLite visualizations to be displayed directly in Jupyter notebooks
 or Jupyter Lab. For the moment they are handled separately, in that the Jupyter
@@ -47,12 +48,15 @@
 where @vlShow@ should be imported automatically by IHaskell.
 -}
 
-module IHaskell.Display.Hvega (vlShow) where
+module IHaskell.Display.Hvega (vlShow, VegaLiteLab) where
 
 import qualified Data.Text.Lazy as LT
 
 import Data.Aeson.Text (encodeToLazyText)
+
+#if !(MIN_VERSION_base(4, 12, 0))
 import Data.Monoid ((<>))
+#endif
 
 import Graphics.Vega.VegaLite (VegaLite, fromVL)
 
@@ -72,8 +76,8 @@
 --   since the JavaScript @fs@ module may not be loaded.
 --
 instance IHaskellDisplay VegaLite where
-  display vl = 
-  
+  display vl =
+
     let -- Note: need to look in the package.json files for these packages
         -- to find the "full name" (the contents of the jsdelivr key),
         -- since requirejs does seem to like appending .js to everything.
@@ -105,7 +109,7 @@
                    <> "ndiv.innerHTML = "
                    <> "'Awesome Vega-Lite visualization to appear here';"
                    <> "element[0].appendChild(ndiv);"
-                
+
         js = LT.unpack (encodeToLazyText (fromVL vl))
 
         -- Use the div element we have just created for the plot.
@@ -117,9 +121,9 @@
                <> "function (error) { ndiv.innerHTML = "
                <> "'There was an error: ' + error; });"
                <> "});"
-                      
+
         ds = [javascript (config <> makeDiv <> plot)]
-             
+
     in pure (Display ds)
 
 -- | A wrapper around 'VegaLite' so that we can write a 'Display'
diff --git a/stack.yaml b/stack.yaml
--- a/stack.yaml
+++ b/stack.yaml
@@ -5,4 +5,4 @@
 
 extra-deps: []
 
-resolver: lts-11.19
+resolver: lts-14.18