diff --git a/pkgs/tools/virtualization/mininet/default.nix b/pkgs/tools/virtualization/mininet/default.nix
index 7372d51a62fa..c33389861dd0 100644
--- a/pkgs/tools/virtualization/mininet/default.nix
+++ b/pkgs/tools/virtualization/mininet/default.nix
@@ -9,7 +9,7 @@ let
 in
 stdenv.mkDerivation rec {
   pname = "mininet";
-  version = "2.3.0";
+  version = "2.3.1b4";
 
   outputs = [ "out" "py" ];
 
@@ -17,7 +17,7 @@ stdenv.mkDerivation rec {
     owner = "mininet";
     repo = "mininet";
     rev = version;
-    sha256 = "sha256-bCppmeB+zQMKTptnzhsXtl72XJXU3USo7cQgP1Z6SrY=";
+    hash = "sha256-Z7Vbfu0EJ4+rCpckXrt3hgxeB9N2nnyPIXgPBnpV4uw=";
   };
 
   buildFlags = [ "mnexec" ];
@@ -41,9 +41,7 @@ stdenv.mkDerivation rec {
 
   meta = with lib; {
     description = "Emulator for rapid prototyping of Software Defined Networks";
-    license = {
-      fullName = "Mininet 2.3.0 License";
-    };
+    license = licenses.bsd3;
     platforms = platforms.linux;
     homepage = "https://github.com/mininet/mininet";
     maintainers = with maintainers; [ teto ];