diff --git a/proxy/package-lock.json b/proxy/package-lock.json
index 866c38b..491c644 100644
--- a/proxy/package-lock.json
+++ b/proxy/package-lock.json
@@ -9,7 +9,7 @@
       "version": "0.1.0",
       "license": "GPL-3.0-or-later",
       "dependencies": {
-        "which": "^5.0.0"
+        "which": "^6.0.0"
       },
       "bin": {
         "ellsp": "start.js"
@@ -1728,9 +1728,9 @@
       }
     },
     "node_modules/which": {
-      "version": "5.0.0",
-      "resolved": "https://registry.npmjs.org/which/-/which-5.0.0.tgz",
-      "integrity": "sha512-JEdGzHwwkrbWoGOlIHqQ5gtprKGOenpDHpxE9zVR1bWbOtYRyPPHMe9FaP6x61CmNaTThSkb0DAJte5jD+DmzQ==",
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/which/-/which-6.0.0.tgz",
+      "integrity": "sha512-f+gEpIKMR9faW/JgAgPK1D7mekkFoqbmiwvNzuhsHetni20QSgzg9Vhn0g2JSJkkfehQnqdUAx7/e15qS1lPxg==",
       "license": "ISC",
       "dependencies": {
         "isexe": "^3.1.1"
@@ -1739,7 +1739,7 @@
         "node-which": "bin/which.js"
       },
       "engines": {
-        "node": "^18.17.0 || >=20.5.0"
+        "node": "^20.17.0 || >=22.9.0"
       }
     },
     "node_modules/wrap-ansi": {
diff --git a/proxy/package.json b/proxy/package.json
index fc1eb63..a9ecf88 100644
--- a/proxy/package.json
+++ b/proxy/package.json
@@ -33,7 +33,7 @@
   },
   "homepage": "https://github.com/elisp-lsp/ellsp#readme",
   "dependencies": {
-    "which": "^5.0.0"
+    "which": "^6.0.0"
   },
   "devDependencies": {
     "@yao-pkg/pkg": "^6.0.0"