diff --git a/pkgs/development/tools/b4/default.nix b/pkgs/development/tools/b4/default.nix
index 130d7f1d23af..8ef941653e41 100644
--- a/pkgs/development/tools/b4/default.nix
+++ b/pkgs/development/tools/b4/default.nix
@@ -2,11 +2,11 @@
 
 python3Packages.buildPythonApplication rec {
   pname = "b4";
-  version = "0.10.1";
+  version = "0.12.1";
 
   src = python3Packages.fetchPypi {
     inherit pname version;
-    sha256 = "zESWjmKz4DaiGg1VmbDlouTNm71YqIr1y9MCev72tEQ=";
+    sha256 = "sha256-BFvuxwcHG2KCv5LAeus50IDJ2mBCyixg3ETq9UzPmSA=";
   };
 
   # tests make dns requests and fails