diff --git a/reviewable/package.json b/reviewable/package.json
index d2f0a1e..2427493 100644
--- a/reviewable/package.json
+++ b/reviewable/package.json
@@ -23,7 +23,7 @@
   "homepage": "https://github.com/bayesimpact/bayes-developer-setup#readme",
   "funding": "https://www.helloasso.com/associations/bayes-impact-france/formulaires/5",
   "devDependencies": {
-    "chai": "^3.5.0",
+    "chai": "^4.3.7",
     "eslint": "^6.x.x",
     "lodash": "4.x.x",
     "mocha": "^2.5.3"