diff --git a/extension/changelog.txt b/extension/changelog.txt
index 342743cef83..e96e52ad940 100644
--- a/extension/changelog.txt
+++ b/extension/changelog.txt
@@ -1,5 +1,7 @@
 <div class="lightboxed">
 
+version 8.5.13 on January 6, 2026: <a href="https://github.com/FlowCrypt/flowcrypt-browser/milestone/487?closed=1" target="_blank">Improvements for attachments handling, print message date fix</a>
+
 version 8.5.12 on November 25, 2025: <a href="https://github.com/FlowCrypt/flowcrypt-browser/milestone/486?closed=1" target="_blank">Improvements for attachments handling, print message date fix</a>
 
 version 8.5.11 on May 20, 2025: <a href="https://github.com/FlowCrypt/flowcrypt-browser/milestone/485?closed=1" target="_blank">Improvements for key generation and message parsing</a>
diff --git a/package-lock.json b/package-lock.json
index be3d1cf0620..273af4dffde 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "flowcrypt-browser",
-  "version": "8.5.12",
+  "version": "8.5.13",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "flowcrypt-browser",
-      "version": "8.5.12",
+      "version": "8.5.13",
       "hasInstallScript": true,
       "license": "SEE LICENSE IN <LICENSE>",
       "dependencies": {
diff --git a/package.json b/package.json
index 340a316de9b..f58379f9f3f 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "flowcrypt-browser",
-  "version": "8.5.12",
+  "version": "8.5.13",
   "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 cafa5fa6cb4..8f28855374f 100644
--- a/tooling/release-firefox-latest-update.json
+++ b/tooling/release-firefox-latest-update.json
@@ -3,9 +3,9 @@
     "firefox@cryptup.io": {
       "updates": [
         {
-          "version": "8.5.12",
-          "update_link": "https://s3-us-west-2.amazonaws.com/cryptup-release/firefox/cryptup-io-firefox-8.5.12.xpi",
-          "update_hash": "sha256:6067667bbed98e57b342e03aae50cfa33dde44b55c69213f7ffb11c8a137e082",
+          "version": "8.5.13",
+          "update_link": "https://s3-us-west-2.amazonaws.com/cryptup-release/firefox/cryptup-io-firefox-8.5.13.xpi",
+          "update_hash": "sha256:255dbf07304c21ac9ebb7ff84fc7b6f3fbfa9d9f818ad55df590e51852bc00a9",
           "applications": {
             "gecko": {
               "strict_min_version": "112.0"