diff --git a/backend/package.json b/backend/package.json
index eb279e36..8fb9adbf 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -75,7 +75,6 @@
     "utf-8-validate": "^5.0.5",
     "uuid": "^9.0.0",
     "yawn-yaml": "github:dragory/yawn-yaml#string-number-fix-build",
-    "zlib-sync": "^0.1.7",
     "zod": "^3.25.17"
   },
   "devDependencies": {
diff --git a/package-lock.json b/package-lock.json
index d74074ca..fc5a9014 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -69,7 +69,6 @@
         "utf-8-validate": "^5.0.5",
         "uuid": "^9.0.0",
         "yawn-yaml": "github:dragory/yawn-yaml#string-number-fix-build",
-        "zlib-sync": "^0.1.7",
         "zod": "^3.25.17"
       },
       "devDependencies": {
@@ -12734,10 +12733,6 @@
         "node": ">=12"
       }
     },
-    "node_modules/nan": {
-      "version": "2.18.0",
-      "license": "MIT"
-    },
     "node_modules/nanoassert": {
       "version": "1.1.0",
       "license": "ISC"
@@ -21167,13 +21162,6 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
-    "node_modules/zlib-sync": {
-      "version": "0.1.9",
-      "license": "MIT",
-      "dependencies": {
-        "nan": "^2.18.0"
-      }
-    },
     "node_modules/zod": {
       "version": "3.25.17",
       "license": "MIT",