diff --git a/pkgs/development/python-modules/altair/default.nix b/pkgs/development/python-modules/altair/default.nix
index 344a724756e..3cd944cad9a 100644
--- a/pkgs/development/python-modules/altair/default.nix
+++ b/pkgs/development/python-modules/altair/default.nix
@@ -18,11 +18,11 @@
 
 buildPythonPackage rec {
   pname = "altair";
-  version = "3.2.0";
+  version = "4.0.0";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "098macm0sw54xqijdy1c8cppcgw79wn52qdc71qqb51nibc17gls";
+    sha256 = "92dcd7b84c715f8e02bbdf37e36193a4af8138b5b064c05f237e6ed41573880a";
   };
 
   propagatedBuildInputs = [