diff --git a/pkgs/development/tools/scalafmt/default.nix b/pkgs/development/tools/scalafmt/default.nix
index c1b47d901980..ee49ee1bf6d9 100644
--- a/pkgs/development/tools/scalafmt/default.nix
+++ b/pkgs/development/tools/scalafmt/default.nix
@@ -2,7 +2,7 @@
 
 let
   baseName = "scalafmt";
-  version = "3.3.1";
+  version = "3.4.0";
   deps = stdenv.mkDerivation {
     name = "${baseName}-deps-${version}";
     buildCommand = ''
@@ -13,7 +13,7 @@ let
     '';
     outputHashMode = "recursive";
     outputHashAlgo = "sha256";
-    outputHash     = "hEfy8hNuWin7mKXs9yD9bEKHCVNuxrz5qasTeLOi1zY=";
+    outputHash     = "l5F09bjRev2eBHKTMzojC7+USkW7qf3YtA2KSoN7MxM=";
   };
 in
 stdenv.mkDerivation {