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 beab73cbbbeb..d3b419613988 100644
--- a/pkgs/development/tools/parsing/tree-sitter/grammars/grammar-sources.nix
+++ b/pkgs/development/tools/parsing/tree-sitter/grammars/grammar-sources.nix
@@ -1329,10 +1329,10 @@
   };
 
   just = {
-    version = "0-unstable-2025-01-05";
+    version = "0-unstable-2026-03-15";
     url = "github:casey/tree-sitter-just";
-    rev = "bb0c898a80644de438e6efe5d88d30bf092935cd";
-    hash = "sha256-FwEuH/2R745jsuFaVGNeUTv65xW+MPjbcakRNcAWfZU=";
+    rev = "d9da862c156020c1a83d3c6ccdda32be6d8a5d4a";
+    hash = "sha256-YV+vab/QqGHVPV1e3wjd0w1nFskJEIU4ukq/yIlojk0=";
     meta = {
       license = lib.licenses.asl20;
     };