diff --git a/package.json b/package.json
index 4b4679e..6c00966 100644
--- a/package.json
+++ b/package.json
@@ -57,7 +57,7 @@
     "@voxpelli/eslint-config": "^19.0.0",
     "@voxpelli/tsconfig": "^11.0.0",
     "c8": "^9.1.0",
-    "chai": "^4.4.1",
+    "chai": "^5.1.1",
     "chai-as-promised": "^7.1.1",
     "chai-quantifiers": "^1.0.18",
     "eslint": "^8.57.0",
@@ -75,7 +75,7 @@
     "knip": "^5.15.0",
     "mocha": "^10.4.0",
     "npm-run-all2": "^6.1.2",
-    "sinon": "^17.0.1",
+    "sinon": "^18.0.0",
     "sinon-chai": "^3.7.0",
     "type-coverage": "^2.28.2",
     "typescript": "~5.4.5"