diff --git a/.eslintrc.json b/.eslintrc.json
index 35a12381..6b80b465 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -19,7 +19,6 @@
   ],
   "rules": {
     "no-console": "error",
-    "no-unused-vars": "warn",
     "no-prototype-builtins": "error",
     "one-var": ["error", "never"],
     "no-duplicate-imports": "error",
@@ -31,7 +30,7 @@
     "prefer-template": "error",
     "deprecation/deprecation": "error",
     "@typescript-eslint/no-non-null-assertion": "error",
-    "@typescript-eslint/no-unused-vars": "warn",
+    "@typescript-eslint/no-unused-vars": "error",
     "@typescript-eslint/no-this-alias": "error"
   }
 }
diff --git a/src/signed-xml.ts b/src/signed-xml.ts
index 43af106d..761331e4 100644
--- a/src/signed-xml.ts
+++ b/src/signed-xml.ts
@@ -46,7 +46,7 @@ export class SignedXml {
    */
   inclusiveNamespacesPrefixList: string[] = [];
   namespaceResolver: XPathNSResolver = {
-    lookupNamespaceURI: function (prefix) {
+    lookupNamespaceURI: function (/* prefix */) {
       throw new Error("Not implemented");
     },
   };
diff --git a/test/key-info-tests.spec.ts b/test/key-info-tests.spec.ts
index 964beb98..e46b2577 100644
--- a/test/key-info-tests.spec.ts
+++ b/test/key-info-tests.spec.ts
@@ -1,4 +1,3 @@
-import { select } from "xpath";
 import * as xmldom from "@xmldom/xmldom";
 import * as fs from "fs";
 import * as xpath from "xpath";