diff --git a/pkgs/development/tools/parsing/tree-sitter/default.nix b/pkgs/development/tools/parsing/tree-sitter/default.nix
index 79dd9a6b57d4..e81e5e48bdf6 100644
--- a/pkgs/development/tools/parsing/tree-sitter/default.nix
+++ b/pkgs/development/tools/parsing/tree-sitter/default.nix
@@ -91,7 +91,7 @@ let
           in
           {
             name =
-              (lib.strings.replaceStrings ["-"] ["_"]
+              (lib.strings.replaceStrings [ "-" ] [ "_" ]
                 (lib.strings.removePrefix "tree-sitter-"
                   (lib.strings.removeSuffix "-grammar" name)))
               + stdenv.hostPlatform.extensions.sharedLibrary;
diff --git a/pkgs/development/tools/parsing/tree-sitter/grammars/tree-sitter-markdown.json b/pkgs/development/tools/parsing/tree-sitter/grammars/tree-sitter-markdown.json
index c908bde0dfff..e34455069bc3 100644
--- a/pkgs/development/tools/parsing/tree-sitter/grammars/tree-sitter-markdown.json
+++ b/pkgs/development/tools/parsing/tree-sitter/grammars/tree-sitter-markdown.json
@@ -1,9 +1,9 @@
 {
-  "url": "https://github.com/ikatyang/tree-sitter-markdown",
-  "rev": "8b8b77af0493e26d378135a3e7f5ae25b555b375",
-  "date": "2021-04-18T20:49:21+08:00",
-  "path": "/nix/store/4z2k0q6rwqmb7vbqr4vgc26w28szlan3-tree-sitter-markdown",
-  "sha256": "1a2899x7i6dgbsrf13qzmh133hgfrlvmjsr3bbpffi1ixw1h7azk",
+  "url": "https://github.com/MDeiml/tree-sitter-markdown",
+  "rev": "8bee14c30ecadd55c2d65633973b4e81f93525e0",
+  "date": "2022-01-16T14:47:09+01:00",
+  "path": "/nix/store/cv7xqvcj4bjifzddkx5n2jd723dc6vlf-tree-sitter-markdown",
+  "sha256": "0vibmpp86pkqllfhb0kg6zhaz09sh8m6a2d1xa8p2qdi7ryy7wqa",
   "fetchLFS": false,
   "fetchSubmodules": false,
   "deepClone": false,
diff --git a/pkgs/development/tools/parsing/tree-sitter/update.nix b/pkgs/development/tools/parsing/tree-sitter/update.nix
index 328c0e8bb6df..c0a5812d7e88 100644
--- a/pkgs/development/tools/parsing/tree-sitter/update.nix
+++ b/pkgs/development/tools/parsing/tree-sitter/update.nix
@@ -117,7 +117,7 @@ let
       repo = "tree-sitter-make";
     };
     "tree-sitter-markdown" = {
-      orga = "ikatyang";
+      orga = "MDeiml";
       repo = "tree-sitter-markdown";
     };
     "tree-sitter-rst" = {