diff --git a/pkgs/development/tools/parsing/tree-sitter/grammars/grammar-sources.nix b/pkgs/development/tools/parsing/tree-sitter/grammars/grammar-sources.nix
index f08aadc1576a..4388ed077165 100644
--- a/pkgs/development/tools/parsing/tree-sitter/grammars/grammar-sources.nix
+++ b/pkgs/development/tools/parsing/tree-sitter/grammars/grammar-sources.nix
@@ -170,7 +170,7 @@
   };
 
   fennel = {
-    version = "0-unstable-2025-09-07";
+    version = "1.1.0-unstable-2025-09-07";
     url = "github:travonted/tree-sitter-fennel/36eb796a84b4f57bdf159d0a99267260d4960c89";
     hash = "sha256-aFcTPgWkd/o1qu8d/hulmVDyFlTHJgb35iea4Jc1510=";
   };