diff --git a/mocha-setup.js b/mocha-setup.js
index a702f48..4f7a6e6 100644
--- a/mocha-setup.js
+++ b/mocha-setup.js
@@ -1,8 +1,6 @@
 import * as chai from 'chai';
 import chaiString from 'chai-string';
 import sinonChai from 'sinon-chai';
-import subset from 'chai-subset';
 
 chai.use(chaiString);
 chai.use(sinonChai);
-chai.use(subset);
diff --git a/package-lock.json b/package-lock.json
index 508df85..067d84c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -13,14 +13,12 @@
         "@changesets/cli": "^2.29.8",
         "@rdfjs/types": "^2",
         "@tpluscode/eslint-config": "0.6.4",
-        "@types/chai-subset": "^1",
         "@types/mocha": "^10.0.10",
         "@types/node": "^25",
         "@types/sinon-chai": "^4.0.0",
         "@typescript-eslint/eslint-plugin": "^6.9.1",
         "@typescript-eslint/parser": "^6.9.1",
         "c8": "^10.1.3",
-        "chai-subset": "^1",
         "husky": "^9.1.4",
         "jest-resolve": "^29.5.0",
         "lint-staged": "^15",
@@ -3532,16 +3530,6 @@
         "@types/chai": "*"
       }
     },
-    "node_modules/@types/chai-subset": {
-      "version": "1.3.5",
-      "resolved": "https://registry.npmjs.org/@types/chai-subset/-/chai-subset-1.3.5.tgz",
-      "integrity": "sha512-c2mPnw+xHtXDoHmdtcCXGwyLMiauiAyxWMzhGpqHC4nqI/Y5G2XhTampslK2rb59kpcuHon03UH8W6iYUzw88A==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "@types/chai": "*"
-      }
-    },
     "node_modules/@types/clownface": {
       "version": "2.0.7",
       "resolved": "https://registry.npmjs.org/@types/clownface/-/clownface-2.0.7.tgz",
@@ -5177,16 +5165,6 @@
         "chai": "^4.1.2"
       }
     },
-    "node_modules/chai-subset": {
-      "version": "1.6.0",
-      "resolved": "https://registry.npmjs.org/chai-subset/-/chai-subset-1.6.0.tgz",
-      "integrity": "sha512-K3d+KmqdS5XKW5DWPd5sgNffL3uxdDe+6GdnJh3AYPhwnBGRY5urfvfcbRtWIvvpz+KxkL9FeBB6MZewLUNwug==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">=4"
-      }
-    },
     "node_modules/chalk": {
       "version": "2.4.2",
       "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
diff --git a/package.json b/package.json
index 5e18cbd..a73dffd 100644
--- a/package.json
+++ b/package.json
@@ -20,14 +20,12 @@
     "@changesets/cli": "^2.29.8",
     "@rdfjs/types": "^2",
     "@tpluscode/eslint-config": "0.6.4",
-    "@types/chai-subset": "^1",
     "@types/mocha": "^10.0.10",
     "@types/node": "^25",
     "@types/sinon-chai": "^4.0.0",
     "@typescript-eslint/eslint-plugin": "^6.9.1",
     "@typescript-eslint/parser": "^6.9.1",
     "c8": "^10.1.3",
-    "chai-subset": "^1",
     "husky": "^9.1.4",
     "jest-resolve": "^29.5.0",
     "lint-staged": "^15",