diff --git a/CHANGELOG.md b/CHANGELOG.md
index fa09382a..8ccc5133 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@
 
 * This plugin is now using types declarations from the official @peertube/peertube-types package.
 * Builtin Prosody, Share chat url: fixed new day hidding when no scrollbar in readonly mode.
+* Builtin Prosody: using ConverseJS clear_cache_on_logout=true and allow_user_trust_override=false parameters
 
 ## 5.4.0
 
diff --git a/conversejs/builtin.ts b/conversejs/builtin.ts
index 9a92ccac..c284a1f4 100644
--- a/conversejs/builtin.ts
+++ b/conversejs/builtin.ts
@@ -175,6 +175,14 @@ window.initConverse = async function initConverse ({
 
   let isAuthenticated: boolean = false
   if (authenticationUrl !== '') {
+    // We are in builtin-prosody mode.
+    // So the user will never se the «trusted browser» checkbox.
+    // So we have to disable it
+    // (and ensure clear_cache_on_logout is true,
+    // see https://conversejs.org/docs/html/configuration.html#allow-user-trust-override).
+    params.clear_cache_on_logout = true
+    params.allow_user_trust_override = false
+
     const auth = await authenticatedMode(authenticationUrl)
     if (auth) {
       params.authentication = 'login'
diff --git a/package-lock.json b/package-lock.json
index f3e1dd24..b4e9535f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4280,9 +4280,9 @@
       }
     },
     "engine.io": {
-      "version": "6.1.0",
-      "resolved": "https://registry.npmjs.org/engine.io/-/engine.io-6.1.0.tgz",
-      "integrity": "sha512-ErhZOVu2xweCjEfYcTdkCnEYUiZgkAcBBAhW4jbIvNG8SLU3orAqoJCiytZjYF7eTpVmmCrLDjLIEaPlUAs1uw==",
+      "version": "6.1.1",
+      "resolved": "https://registry.npmjs.org/engine.io/-/engine.io-6.1.1.tgz",
+      "integrity": "sha512-AyMc20q8JUUdvKd46+thc9o7yCZ6iC6MoBCChG5Z1XmFMpp+2+y/oKvwpZTUJB0KCjxScw1dV9c2h5pjiYBLuQ==",
       "dev": true,
       "requires": {
         "@types/cookie": "^0.4.1",