diff --git a/packages/backend/.swcrc b/packages/backend/.swcrc
index d9f047b6ac..0504a2d389 100644
--- a/packages/backend/.swcrc
+++ b/packages/backend/.swcrc
@@ -11,7 +11,7 @@
 			"decoratorMetadata": true
 		},
 		"experimental": {
-			"keepImportAttributes": true
+			"keepImportAssertions": true
 		},
 		"baseUrl": "src",
 		"paths": {
diff --git a/packages/misskey-js/.swcrc b/packages/misskey-js/.swcrc
index d9f047b6ac..0504a2d389 100644
--- a/packages/misskey-js/.swcrc
+++ b/packages/misskey-js/.swcrc
@@ -11,7 +11,7 @@
 			"decoratorMetadata": true
 		},
 		"experimental": {
-			"keepImportAttributes": true
+			"keepImportAssertions": true
 		},
 		"baseUrl": "src",
 		"paths": {