diff --git a/pkgs/development/python-modules/mpmath/default.nix b/pkgs/development/python-modules/mpmath/default.nix
index 42de3d2da9a..b7d3c2f7ff6 100644
--- a/pkgs/development/python-modules/mpmath/default.nix
+++ b/pkgs/development/python-modules/mpmath/default.nix
@@ -5,11 +5,11 @@
 
 buildPythonPackage rec {
   pname = "mpmath";
-  version = "1.1.0";
+  version = "1.2.1";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "fc17abe05fbab3382b61a123c398508183406fa132e0223874578e20946499f6";
+    sha256 = "79ffb45cf9f4b101a807595bcb3e72e0396202e0b1d25d689134b48c4216a81a";
   };
 
   # error: invalid command 'test'