diff --git a/package.json b/package.json
index 060c95614..61fc9e177 100644
--- a/package.json
+++ b/package.json
@@ -64,7 +64,7 @@
     "css-units-list": "2.1.0",
     "dashify": "2.0.0",
     "deno-path-from-file-url": "0.0.6",
-    "diff": "8.0.4",
+    "diff": "9.0.0",
     "editorconfig-without-wasm": "0.0.4",
     "emoji-regex": "10.6.0",
     "escape-string-regexp": "5.0.0",
diff --git a/tests/integration/__tests__/__snapshots__/debug-check.js.snap b/tests/integration/__tests__/__snapshots__/debug-check.js.snap
index 50cad3b9e..52a9d99bd 100644
--- a/tests/integration/__tests__/__snapshots__/debug-check.js.snap
+++ b/tests/integration/__tests__/__snapshots__/debug-check.js.snap
@@ -43,8 +43,8 @@ exports[`show diff for 2+ error files with --debug-check  1`] = `
   "stderr": "[error] a.debug-check: prettier(input) !== prettier(prettier(input))
 [error] Index: 
 [error] ===================================================================
-[error] --- 	
-[error] +++ 	
+[error] --- 
+[error] +++ 
 [error] @@ -1,2 +1,4 @@
 [error]  hello
 [error]  hello
@@ -54,8 +54,8 @@ exports[`show diff for 2+ error files with --debug-check  1`] = `
 [error] b.debug-check: prettier(input) !== prettier(prettier(input))
 [error] Index: 
 [error] ===================================================================
-[error] --- 	
-[error] +++ 	
+[error] --- 
+[error] +++ 
 [error] @@ -1,2 +1,4 @@
 [error]  world
 [error]  world
diff --git a/yarn.lock b/yarn.lock
index 928157604..d33215b25 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4274,10 +4274,10 @@ __metadata:
   languageName: node
   linkType: hard
 
-"diff@npm:8.0.4":
-  version: 8.0.4
-  resolution: "diff@npm:8.0.4"
-  checksum: 10/b4036ceda0d1e10683a2313079ed52c5e6b09553ae29da87bce81d98714d9725dbf3c0f6f7c3b1f16eec049fe17087e38ee329e732580fa62f6ec1c2487b2435
+"diff@npm:9.0.0":
+  version: 9.0.0
+  resolution: "diff@npm:9.0.0"
+  checksum: 10/f8b5e38a6a7ec73d1850ccb7ff19cda1d02502dc0f2c562ada0f40d7211bfb3075c2f3742104619a1f8f47ae333d48a6c77bffb080a2df900db36935080ea4fb
   languageName: node
   linkType: hard
 
@@ -8617,7 +8617,7 @@ __metadata:
     css-units-list: "npm:2.1.0"
     dashify: "npm:2.0.0"
     deno-path-from-file-url: "npm:0.0.6"
-    diff: "npm:8.0.4"
+    diff: "npm:9.0.0"
     editorconfig-without-wasm: "npm:0.0.4"
     emoji-regex: "npm:10.6.0"
     enquirer: "npm:2.4.1"