diff --git a/pkgs/development/tools/parsing/tree-sitter/update.nix b/pkgs/development/tools/parsing/tree-sitter/update.nix
index cf9502ed575e..2174fba4393f 100644
--- a/pkgs/development/tools/parsing/tree-sitter/update.nix
+++ b/pkgs/development/tools/parsing/tree-sitter/update.nix
@@ -494,6 +494,21 @@ let
     };
   };
 
+  pinnedGrammars = [
+    "tree-sitter-bash"
+    "tree-sitter-bibtex"
+    "tree-sitter-c"
+    "tree-sitter-comment"
+    "tree-sitter-fortran"
+    "tree-sitter-hcl"
+    "tree-sitter-hyprlang"
+    "tree-sitter-llvm"
+    "tree-sitter-markdown"
+    "tree-sitter-query"
+    "tree-sitter-rust"
+  ];
+  pinnedGrammarsJson = jsonFile pinnedGrammars;
+
   allGrammars =
     let
       treeSitterOrgaGrammars = lib.listToAttrs (
@@ -523,6 +538,7 @@ let
         inherit
           knownTreeSitterOrgGrammarRepos
           ignoredTreeSitterOrgRepos
+          pinnedGrammars
           ;
       }
       (
diff --git a/pkgs/development/tools/parsing/tree-sitter/update_impl.py b/pkgs/development/tools/parsing/tree-sitter/update_impl.py
index a53e1ee62c36..3133aa3902af 100644
--- a/pkgs/development/tools/parsing/tree-sitter/update_impl.py
+++ b/pkgs/development/tools/parsing/tree-sitter/update_impl.py
@@ -96,6 +96,10 @@ def fetchRepo() -> None:
             "outputDir": outputDir,
             "nixRepoAttrName": nixRepoAttrName,
         }:
+            if repo in args["pinnedGrammars"]:
+                log(f"Grammar {repo} is pinned, skipping upgrade...")
+                return
+
             token: str | None = os.environ.get("GITHUB_TOKEN", None)
             out = run_cmd(
                 curl_github_args(