diff --git a/extension.toml b/extension.toml
index 24c4fb8..2a521b5 100644
--- a/extension.toml
+++ b/extension.toml
@@ -6,10 +6,6 @@ authors = [ "d1y <chenhonzho@gmail.com>" ]
 description = "Provides Git Syntax Highlighting"
 repository = "https://github.com/d1y/git_firefly"
 
-[grammars.diff]
-repository = "https://github.com/the-mikedavis/tree-sitter-diff"
-commit = "c165725c28e69b36c5799ff0e458713a844f1aaf"
-
 [grammars.git_commit]
 repository = "https://github.com/the-mikedavis/tree-sitter-git-commit"
 commit = "6f193a66e9aa872760823dff020960c6cedc37b3"
diff --git a/languages/diff/config.toml b/languages/diff/config.toml
deleted file mode 100644
index 886f469..0000000
--- a/languages/diff/config.toml
+++ /dev/null
@@ -1,5 +0,0 @@
-name = "Diff"
-grammar = "diff"
-path_suffixes = ["diff"]
-line_comments = ["#"]
-brackets = []
diff --git a/languages/diff/highlights.scm b/languages/diff/highlights.scm
deleted file mode 100644
index d8e6008..0000000
--- a/languages/diff/highlights.scm
+++ /dev/null
@@ -1,15 +0,0 @@
-[
-  (addition)
-  (new_file)
-] @diff.plus
-
-[
-  (deletion)
-  (old_file)
-] @diff.minus
-
-(commit) @constant
-
-(location) @attribute
-
-(command) @function