diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,7 +1,15 @@
 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).
 
-## 0.2.2.0 - 0.2.5.0
+## 0.3.0.0
+
+Support for the IHaskell notebook has been updated to version 4 of the
+Vega-Lite schema. Finally.
+
+Support for the Jupyter Lab interface remains stuck in a maze of
+very-twisty paths...
+
+## 0.2.2.0 - 0.2.6.0
 
 Bump the maximum version of hvega.
 
diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -19,11 +19,11 @@
 
 # Current status
 
-If your visualization uses anything more modern than version 2 of the Vega-Lite
-specification (and possibly even version 2 features) then there is a good chance
-that it will not display correctly in IHaskell. This can differ depending on
-whether you are using the notebook or lab interface.
+The display should work correctly when using the IHaskell `notebook`
+interface, supporting features included in Vega-Lite 4 (this is new to
+version 0.3, as earlier versions were limited to features in Vega-Lite
+3).
 
-For the lab interface I am waiting for support for custom mime-types to be
-released (it is in the master branch of IHaskell). For the notebook interface
-I gave up on trying to work through the JavaScript issues I came across.
+Support for the Jupyter lab interface is **very limited** since there
+is a curious combination of IHaskell and Jupyter lab issues (including
+whether you are using v1.2 or v2). This is very annoying.
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:             0.2.6.0
+version:             0.3.0.0
 synopsis:            IHaskell display instance for hvega types.
 description:         Support Vega-Lite visualizations in IHaskell notebooks.
 homepage:            https://github.com/DougBurke/hvega
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
@@ -3,7 +3,7 @@
 
 {-|
 Module      : IHaskell.Display.Hvega
-Copyright   : (c) Douglas Burke 2018, 2019
+Copyright   : (c) Douglas Burke 2018, 2019, 2020
 License     : BSD3
 
 Maintainer  : dburke.gw@gmail.com
@@ -78,30 +78,15 @@
 instance IHaskellDisplay VegaLite where
   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.
-        --
-        jsname n v = "'https://cdn.jsdelivr.net/npm/"
-                     <> n
-                     <> "@" <> v
-                     <> "/build/"
-                     <> n <> ".min'"
-
-        -- Should the config be set on require or requirejs?
-        --
-        -- These versions are known to work; later versions
-        -- do not work but I have not tried to work out the
-        -- latest version that does work.
-        --
-        config = "requirejs({paths:{vg:" <> jsname "vega" "3.2.1"
-                 <> ",vl:" <> jsname "vega-lite" "2.3.0"
-                 <> ",vge:" <> jsname "vega-embed" "3.5.2"
-                 <> "},shim:{vge:{deps:['vg.global','vl.global']}"
-                 <> ",vl:{deps:['vg']}"
+    let -- does https://github.com/vega/vega-embed/issues/8 help?
+        config = "requirejs.config({"
+                 <> "baseUrl: 'https://cdn.jsdelivr.net/npm/',"
+                 <> "paths: {"
+                 <> "'vega-embed': 'vega-embed@6?noext',"
+                 <> "'vega-lib': 'vega-lib?noext',"
+                 <> "'vega-lite': 'vega-lite@4?noext',"
+                 <> "'vega': 'vega@5?noext'"
                  <> "}});"
-                 <> "define('vg.global',['vg'],function(g){window.vega = g;});"
-                 <> "define('vl.global',['vl'],function(g){window.vl = g;});"
 
         -- rely on the element variable being set up; it appears to be an array
         -- so use the first element to add the div to.
@@ -115,7 +100,7 @@
         -- Use the div element we have just created for the plot.
         -- More options could be passed to vegaEmbed.
         --
-        plot = "require(['vge'],function(vegaEmbed){"
+        plot = "require(['vega-embed'],function(vegaEmbed){"
                <> "vegaEmbed(ndiv," <> js <> ").then("
                <> "function (result) { console.log(result); }).catch("
                <> "function (error) { ndiv.innerHTML = "