diff --git a/pkgs/development/python-modules/altair/default.nix b/pkgs/development/python-modules/altair/default.nix
index db3c2d27c8b..c80af1acdc5 100644
--- a/pkgs/development/python-modules/altair/default.nix
+++ b/pkgs/development/python-modules/altair/default.nix
@@ -18,12 +18,12 @@
 
 buildPythonPackage rec {
   pname = "altair";
-  version = "4.0.0";
+  version = "4.0.1";
   disabled = isPy27;
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "92dcd7b84c715f8e02bbdf37e36193a4af8138b5b064c05f237e6ed41573880a";
+    sha256 = "145gjad415zjfp0ciq1b19i97ibavj8fki1vzhjppqz55k4704nk";
   };
 
   propagatedBuildInputs = [