diff --git a/pkgs/development/python-modules/mypy/default.nix b/pkgs/development/python-modules/mypy/default.nix
index 90b00ba17179..bcd0ab4a6c62 100644
--- a/pkgs/development/python-modules/mypy/default.nix
+++ b/pkgs/development/python-modules/mypy/default.nix
@@ -5,12 +5,12 @@
 
 buildPythonPackage rec {
   pname = "mypy";
-  version = "0.761";
+  version = "0.770";
   disabled = !isPy3k;
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "1gw7h84d21wmi267kmgqs9whz0l7rp62pzja2f31wq7cfj6spfl5";
+    sha256 = "1bm40nx9g1n4nj1309cijnh0ns4qbhym3agyl537nc4vxw3paqla";
   };
 
   propagatedBuildInputs = [ typed-ast psutil mypy-extensions typing-extensions ];