diff --git a/pkgs/development/tools/parsing/tree-sitter/grammars/default.nix b/pkgs/development/tools/parsing/tree-sitter/grammars/default.nix
index 9786412e9192..5b3862082d8f 100644
--- a/pkgs/development/tools/parsing/tree-sitter/grammars/default.nix
+++ b/pkgs/development/tools/parsing/tree-sitter/grammars/default.nix
@@ -46,6 +46,7 @@
   tree-sitter-jsdoc = lib.importJSON ./tree-sitter-jsdoc.json;
   tree-sitter-json = lib.importJSON ./tree-sitter-json.json;
   tree-sitter-json5 = lib.importJSON ./tree-sitter-json5.json;
+  tree-sitter-jsonnet = lib.importJSON ./tree-sitter-jsonnet.json;
   tree-sitter-julia = lib.importJSON ./tree-sitter-julia.json;
   tree-sitter-kotlin = lib.importJSON ./tree-sitter-kotlin.json;
   tree-sitter-latex = lib.importJSON ./tree-sitter-latex.json;
diff --git a/pkgs/development/tools/parsing/tree-sitter/grammars/tree-sitter-jsonnet.json b/pkgs/development/tools/parsing/tree-sitter/grammars/tree-sitter-jsonnet.json
new file mode 100644
index 000000000000..11ef27c05e92
--- /dev/null
+++ b/pkgs/development/tools/parsing/tree-sitter/grammars/tree-sitter-jsonnet.json
@@ -0,0 +1,11 @@
+{
+  "url": "https://github.com/sourcegraph/tree-sitter-jsonnet",
+  "rev": "0475a5017ad7dc84845d1d33187f2321abcb261d",
+  "date": "2022-05-27T01:23:53-04:00",
+  "path": "/nix/store/n4yijz5b0bky4zd8kvh632a5zlxc3rfv-tree-sitter-jsonnet",
+  "sha256": "1dh8wqi8mnsapzicrdjg6cj6skj9f2ia4ijg08pl45bcxc1lidzc",
+  "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 81c9debe84b5..49863f189dad 100644
--- a/pkgs/development/tools/parsing/tree-sitter/update.nix
+++ b/pkgs/development/tools/parsing/tree-sitter/update.nix
@@ -53,7 +53,7 @@ let
     # this is the haskell language bindings, tree-sitter-haskell is the grammar
     "haskell-tree-sitter"
     # this is the ruby language bindings, tree-sitter-ruby is the grammar
-    "ruby-tree-sitter"
+    "ruby-tree-sitter.old"
     # this is the (unmaintained) rust language bindings, tree-sitter-rust is the grammar
     "rust-tree-sitter"
     # this is the nodejs language bindings, tree-sitter-javascript is the grammar
@@ -347,6 +347,10 @@ let
       orga = "indoorvivants";
       repo = "tree-sitter-smithy";
     };
+    "tree-sitter-jsonnet" = {
+      orga = "sourcegraph";
+      repo = "tree-sitter-jsonnet";
+    };
   };
 
   allGrammars =