diff --git a/extension/changelog.txt b/extension/changelog.txt
index 75f7610be8c..2c9eb17c85d 100644
--- a/extension/changelog.txt
+++ b/extension/changelog.txt
@@ -1,5 +1,7 @@
 <div class="lightboxed">
 
+version 8.5.5 on May 20, 2024: <a href="https://github.com/FlowCrypt/flowcrypt-browser/milestone/478?closed=1" target="_blank">Manifest V3</a>
+
 version 8.5.4 on March 7, 2024: <a href="https://github.com/FlowCrypt/flowcrypt-browser/milestone/476?closed=1" target="_blank">Improved compatibility with firewalls</a>
 
 version 8.5.3 on February 7, 2024: <a href="https://github.com/FlowCrypt/flowcrypt-browser/milestone/468?closed=1" target="_blank">Improvements for encrypted content detection and PGP/MIME messages parsing</a>
diff --git a/package-lock.json b/package-lock.json
index c12d40f95ed..90a38776159 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "flowcrypt-browser",
-  "version": "8.5.4",
+  "version": "8.5.5",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "flowcrypt-browser",
-      "version": "8.5.4",
+      "version": "8.5.5",
       "hasInstallScript": true,
       "license": "SEE LICENSE IN <LICENSE>",
       "dependencies": {
diff --git a/package.json b/package.json
index a53fa64efec..7bf2875e03e 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "flowcrypt-browser",
-  "version": "8.5.4",
+  "version": "8.5.5",
   "description": "Simple end-to-end encryption to secure email and attachments on Google.",
   "resolutions": {
     "graceful-fs": "4.1.13"
diff --git a/tooling/release-firefox-latest-update.json b/tooling/release-firefox-latest-update.json
index 06252949a2e..6a107f079d6 100644
--- a/tooling/release-firefox-latest-update.json
+++ b/tooling/release-firefox-latest-update.json
@@ -3,9 +3,9 @@
     "firefox@cryptup.io": {
       "updates": [
         {
-          "version": "8.5.4",
-          "update_link": "https://s3-us-west-2.amazonaws.com/cryptup-release/firefox/cryptup-io-firefox-8.5.4.xpi",
-          "update_hash": "sha256:a1d0b4050f06e3731f71ef8ce8eb77b3ed990b15c398919d1bd01f05382ef789",
+          "version": "8.5.5",
+          "update_link": "https://s3-us-west-2.amazonaws.com/cryptup-release/firefox/cryptup-io-firefox-8.5.5.xpi",
+          "update_hash": "sha256:4ad9e9c38302480e72e1c3bbdd956dadad45973b7a9c24d8596bfbf1ffd44168",
           "applications": {
             "gecko": {
               "strict_min_version": "60.0"