diff --git a/pkgs/development/tools/parsing/tree-sitter/default.nix b/pkgs/development/tools/parsing/tree-sitter/default.nix
index c3bdca43f36a..a481b11d95fe 100644
--- a/pkgs/development/tools/parsing/tree-sitter/default.nix
+++ b/pkgs/development/tools/parsing/tree-sitter/default.nix
@@ -28,7 +28,7 @@ let
   # to update:
   # 1) change all these hashes
   # 2) nix-build -A tree-sitter.updater.update-all-grammars
-  # 3) Set NIXPKGS_GITHUB_TOKEN env variable to avoid api rate limit (Use a Personal Access Token from https://github.com/settings/tokens It does not need any permissions)
+  # 3) Set GITHUB_TOKEN env variable to avoid api rate limit (Use a Personal Access Token from https://github.com/settings/tokens It does not need any permissions)
   # 4) run the ./result script that is output by that (it updates ./grammars)
   version = "0.25.3";
   hash = "sha256-xafeni6Z6QgPiKzvhCT2SyfPn0agLHo47y+6ExQXkzE=";
@@ -43,7 +43,7 @@ let
 
   update-all-grammars = callPackage ./update.nix { };
 
-  fetchGrammar = (
+  fetchGrammar =
     v:
     fetchgit {
       inherit (v)
@@ -52,8 +52,7 @@ let
         sha256
         fetchSubmodules
         ;
-    }
-  );
+    };
 
   grammars = runCommand "grammars" { } (
     ''
@@ -61,7 +60,7 @@ let
     ''
     + (lib.concatStrings (
       lib.mapAttrsToList (
-        name: grammar: "ln -s ${if grammar ? src then grammar.src else fetchGrammar grammar} $out/${name}\n"
+        name: grammar: "ln -s ${grammar.src or (fetchGrammar grammar)} $out/${name}\n"
       ) (import ./grammars { inherit lib; })
     ))
   );
@@ -134,7 +133,7 @@ let
           };
         };
     in
-    lib.mapAttrs build (grammars);
+    lib.mapAttrs build grammars;
 
   # Usage:
   # pkgs.tree-sitter.withPlugins (p: [ p.tree-sitter-c p.tree-sitter-java ... ])
diff --git a/pkgs/development/tools/parsing/tree-sitter/grammars/default.nix b/pkgs/development/tools/parsing/tree-sitter/grammars/default.nix
index 293d919ef940..8b605c3c9478 100644
--- a/pkgs/development/tools/parsing/tree-sitter/grammars/default.nix
+++ b/pkgs/development/tools/parsing/tree-sitter/grammars/default.nix
@@ -31,6 +31,7 @@
   tree-sitter-fish = lib.importJSON ./tree-sitter-fish.json;
   tree-sitter-fortran = lib.importJSON ./tree-sitter-fortran.json;
   tree-sitter-gdscript = lib.importJSON ./tree-sitter-gdscript.json;
+  tree-sitter-gemini = lib.importJSON ./tree-sitter-gemini.json;
   tree-sitter-gleam = lib.importJSON ./tree-sitter-gleam.json;
   tree-sitter-glimmer = lib.importJSON ./tree-sitter-glimmer.json;
   tree-sitter-glsl = lib.importJSON ./tree-sitter-glsl.json;
diff --git a/pkgs/development/tools/parsing/tree-sitter/grammars/tree-sitter-gemini.json b/pkgs/development/tools/parsing/tree-sitter/grammars/tree-sitter-gemini.json
new file mode 100644
index 000000000000..db1db3bfb97c
--- /dev/null
+++ b/pkgs/development/tools/parsing/tree-sitter/grammars/tree-sitter-gemini.json
@@ -0,0 +1,12 @@
+{
+  "url": "https://github.com/blessanabraham/tree-sitter-gemini",
+  "rev": "3cc5e4bdf572d5df4277fc2e54d6299bd59a54b3",
+  "date": "2023-08-26T22:20:36+03:00",
+  "path": "/nix/store/ywwyjjaps1swpzy0hndllwka4rg8hbdb-tree-sitter-gemini",
+  "sha256": "1r965z6cls7ahipf9bpvcvpv4xda7k1j64lvnwf2bkb83qpakdc2",
+  "hash": "sha256-grWpLh5ozSUct5sSI8M8qnWy72b7ruRuhOpoyswvJuU=",
+  "fetchLFS": false,
+  "fetchSubmodules": false,
+  "deepClone": false,
+  "leaveDotGit": false
+}
diff --git a/pkgs/development/tools/parsing/tree-sitter/update.nix b/pkgs/development/tools/parsing/tree-sitter/update.nix
index 37cfcf6232e2..c4e35962db3b 100644
--- a/pkgs/development/tools/parsing/tree-sitter/update.nix
+++ b/pkgs/development/tools/parsing/tree-sitter/update.nix
@@ -336,6 +336,10 @@ let
       orga = "prestonknopp";
       repo = "tree-sitter-gdscript";
     };
+    "tree-sitter-gemini" = {
+      orga = "blessanabraham";
+      repo = "tree-sitter-gemini";
+    };
     "tree-sitter-godot-resource" = {
       orga = "prestonknopp";
       repo = "tree-sitter-godot-resource";
@@ -574,15 +578,13 @@ let
      }
      ${updateImpl} print-all-grammars-nix-file "$(< ${
        jsonFile "all-grammars.json" {
-         allGrammars = (
-           lib.mapAttrsToList (
-             nixRepoAttrName: attrs:
-             attrs
-             // {
-               inherit nixRepoAttrName;
-             }
-           ) allGrammars
-         );
+         allGrammars = lib.mapAttrsToList (
+           nixRepoAttrName: attrs:
+           attrs
+           // {
+             inherit nixRepoAttrName;
+           }
+         ) allGrammars;
          inherit outputDir;
        }
      })"