diff --git a/pkgs/development/tools/parsing/tree-sitter/grammars/default.nix b/pkgs/development/tools/parsing/tree-sitter/grammars/default.nix
index c5820018bb6b..cb083bd06c75 100644
--- a/pkgs/development/tools/parsing/tree-sitter/grammars/default.nix
+++ b/pkgs/development/tools/parsing/tree-sitter/grammars/default.nix
@@ -39,6 +39,7 @@
   tree-sitter-hjson = lib.importJSON ./tree-sitter-hjson.json;
   tree-sitter-html = lib.importJSON ./tree-sitter-html.json;
   tree-sitter-http = lib.importJSON ./tree-sitter-http.json;
+  tree-sitter-janet-simple = lib.importJSON ./tree-sitter-janet-simple.json;
   tree-sitter-java = lib.importJSON ./tree-sitter-java.json;
   tree-sitter-javascript = lib.importJSON ./tree-sitter-javascript.json;
   tree-sitter-jsdoc = lib.importJSON ./tree-sitter-jsdoc.json;
@@ -57,6 +58,7 @@
   tree-sitter-ocaml = lib.importJSON ./tree-sitter-ocaml.json;
   tree-sitter-org-nvim = lib.importJSON ./tree-sitter-org-nvim.json;
   tree-sitter-perl = lib.importJSON ./tree-sitter-perl.json;
+  tree-sitter-pgn = lib.importJSON ./tree-sitter-pgn.json;
   tree-sitter-php = lib.importJSON ./tree-sitter-php.json;
   tree-sitter-pioasm = lib.importJSON ./tree-sitter-pioasm.json;
   tree-sitter-prisma = lib.importJSON ./tree-sitter-prisma.json;
diff --git a/pkgs/development/tools/parsing/tree-sitter/grammars/tree-sitter-janet-simple.json b/pkgs/development/tools/parsing/tree-sitter/grammars/tree-sitter-janet-simple.json
new file mode 100644
index 000000000000..10b524747a39
--- /dev/null
+++ b/pkgs/development/tools/parsing/tree-sitter/grammars/tree-sitter-janet-simple.json
@@ -0,0 +1,11 @@
+{
+  "url": "https://github.com/sogaiu/tree-sitter-janet-simple",
+  "rev": "e6c04e4b243cf3e5aca8f201e48926a72cc18334",
+  "date": "2022-03-29T10:00:03+09:00",
+  "path": "/nix/store/4ynwhc2s20xm093inlpyxgdb6pbc753m-tree-sitter-janet-simple",
+  "sha256": "1anbd0bx8vcg1rb6mr8hknnd5f9f6zr3h7kn98x8s7znyvlj4w6q",
+  "fetchLFS": false,
+  "fetchSubmodules": false,
+  "deepClone": false,
+  "leaveDotGit": false
+}
diff --git a/pkgs/development/tools/parsing/tree-sitter/grammars/tree-sitter-pgn.json b/pkgs/development/tools/parsing/tree-sitter/grammars/tree-sitter-pgn.json
new file mode 100644
index 000000000000..786fec353d5f
--- /dev/null
+++ b/pkgs/development/tools/parsing/tree-sitter/grammars/tree-sitter-pgn.json
@@ -0,0 +1,11 @@
+{
+  "url": "https://github.com/rolandwalker/tree-sitter-pgn",
+  "rev": "e26ee30850f0cb81541480cf1e2c70385bdb013a",
+  "date": "2021-08-25T17:57:38-04:00",
+  "path": "/nix/store/fj882ab2hl3qrz45zvq366na6d2gqv8v-tree-sitter-pgn",
+  "sha256": "1c4602jmq3p7p7splzip76863l1z3rgbjlbksqv0diqjxp7c42gq",
+  "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 57bf5c0a13c1..e1491ee81da8 100644
--- a/pkgs/development/tools/parsing/tree-sitter/update.nix
+++ b/pkgs/development/tools/parsing/tree-sitter/update.nix
@@ -181,6 +181,10 @@ let
       orga = "bkegley";
       repo = "tree-sitter-graphql";
     };
+    "tree-sitter-pgn" = {
+      orga = "rolandwalker";
+      repo = "tree-sitter-pgn";
+    };
     "tree-sitter-perl" = {
       orga = "ganezdragon";
       repo = "tree-sitter-perl";
@@ -277,6 +281,10 @@ let
       orga = "uyha";
       repo = "tree-sitter-cmake";
     };
+    "tree-sitter-janet-simple" = {
+      orga = "sogaiu";
+      repo = "tree-sitter-janet-simple";
+    };
     "tree-sitter-json5" = {
       orga = "joakker";
       repo = "tree-sitter-json5";