diff --git a/pkgs/development/tools/ammonite/default.nix b/pkgs/development/tools/ammonite/default.nix
index 0e98d63fdd3e..7544958cb314 100644
--- a/pkgs/development/tools/ammonite/default.nix
+++ b/pkgs/development/tools/ammonite/default.nix
@@ -5,12 +5,12 @@
 with stdenv.lib;
 stdenv.mkDerivation rec {
   name = "ammonite-${version}";
-  version = "1.2.0";
+  version = "1.2.1";
   scalaVersion = "2.12";
 
   src = fetchurl {
     url = "https://github.com/lihaoyi/Ammonite/releases/download/${version}/${scalaVersion}-${version}";
-    sha256 = "08kh4j9jsg3c3ks9q5f01i13d1ak701vjviy5wb3y6xsajg62nfj";
+    sha256 = "096xychdq1pmyjfv4cv4pvm29dk539rxpq3iaz9rpznp01af4mjf";
   };
 
   propagatedBuildInputs = [ jre ] ;