diff --git a/package.json b/package.json
index ef3e2885..eeef109c 100644
--- a/package.json
+++ b/package.json
@@ -83,7 +83,7 @@
 		"prettier": "3.7.4",
 		"publint": "0.3.16",
 		"semantic-release": "25.0.2",
-		"tsdown": "0.17.4",
+		"tsdown": "0.18.0",
 		"typescript": "5.9.3",
 		"typescript-eslint": "^8.15.0",
 		"vitest": "3.2.4"
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 99a97989..13832768 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -91,8 +91,8 @@ importers:
         specifier: 25.0.2
         version: 25.0.2(typescript@5.9.3)
       tsdown:
-        specifier: 0.17.4
-        version: 0.17.4(publint@0.3.16)(typescript@5.9.3)
+        specifier: 0.18.0
+        version: 0.18.0(publint@0.3.16)(typescript@5.9.3)
       typescript:
         specifier: 5.9.3
         version: 5.9.3
@@ -3640,10 +3640,9 @@ packages:
   tsconfig-paths@3.15.0:
     resolution: {integrity: sha512-2Ac2RgzDe/cn48GvOe3M+o82pEFewD3UPbyoUHHdKasHwJKjds4fLXWf/Ux5kATBKN20oaFGu+jbElp1pos0mg==}
 
-  tsdown@0.17.4:
-    resolution: {integrity: sha512-z+kNuv1rwM1POQIufDUVrdNc/uGy0ueRVafCyDH39IdHxin4JXgB8DNGSPoqdIpcOpqUoRbNreK8NxENFmlhKw==}
+  tsdown@0.18.0:
+    resolution: {integrity: sha512-Yotdh3NzizysnqR96xfpHFYtEntk1cZvSRHz8A+Pn3ZHNdTQa4fBQxh6HHzWZwfjdQv47xb7GCv6vEWMtxBirw==}
     engines: {node: '>=20.19.0'}
-    deprecated: Including an unexpected breaking change (copy behavior)
     hasBin: true
     peerDependencies:
       '@arethetypeswrong/core': ^0.18.1
@@ -7714,7 +7713,7 @@ snapshots:
       strip-bom: 3.0.0
     optional: true
 
-  tsdown@0.17.4(publint@0.3.16)(typescript@5.9.3):
+  tsdown@0.18.0(publint@0.3.16)(typescript@5.9.3):
     dependencies:
       ansis: 4.2.0
       cac: 6.7.14