diff --git a/pkgs/by-name/gr/gren/generated-backend-package.nix b/pkgs/by-name/gr/gren/generated-backend-package.nix
index 6ff48bab9b53..a097c4ec8656 100644
--- a/pkgs/by-name/gr/gren/generated-backend-package.nix
+++ b/pkgs/by-name/gr/gren/generated-backend-package.nix
@@ -29,11 +29,11 @@
 }:
 mkDerivation {
   pname = "gren";
-  version = "0.6.5";
+  version = "0.6.6";
   src = fetchgit {
     url = "https://github.com/gren-lang/compiler.git";
-    sha256 = "1865x63y0kcp2ax49333i5512vwh845iiyq3b30jm31pr113csvr";
-    rev = "ba2a2153b78086d75fe01ba45bdd630d6f5fc2fc";
+    sha256 = "02hin22kyh2zgxn2fklnfa60iw3ppfr3xnv4z7r39vkf6c2q7fhq";
+    rev = "03c52374f82036e7a3276a94e345a4aa98738b9b";
     fetchSubmodules = true;
   };
   isLibrary = false;
@@ -83,6 +83,6 @@ mkDerivation {
   jailbreak = true;
   homepage = "https://gren-lang.org";
   description = "The `gren` command line interface";
-  license = lib.licensesSpdx."BSD-3-Clause";
+  license = lib.meta.getLicenseFromSpdxId "BSD-3-Clause";
   mainProgram = "gren";
 }
diff --git a/pkgs/by-name/gr/gren/package.nix b/pkgs/by-name/gr/gren/package.nix
index 84ad7637623c..69af8be0e155 100644
--- a/pkgs/by-name/gr/gren/package.nix
+++ b/pkgs/by-name/gr/gren/package.nix
@@ -11,13 +11,13 @@
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "gren";
-  version = "0.6.5";
+  version = "0.6.6";
 
   src = fetchFromGitHub {
     owner = "gren-lang";
     repo = "compiler";
     tag = finalAttrs.version;
-    hash = "sha256-eWs2Qsg3jCrBWAP7GAtBkG8RSoljjES6EpdN4IfpxaA=";
+    hash = "sha256-GLqDBTNu7jTy+WTbPrK7d/AIjHKWTidsf19AP4WwEQo=";
   };
 
   buildInputs = [ nodejs ];