diff --git a/www/pages/download.md b/www/pages/download.md
index 66130412..3dbec293 100644
--- a/www/pages/download.md
+++ b/www/pages/download.md
@@ -1,7 +1,7 @@
 <!--
 .. title: Download
 .. slug: download
-.. date: 2019-09-25 11:28:00 UTC+1
+.. date: 2020-06-09 12:28:00 UTC+1
 .. tags: tag
 .. category: category
 .. link: link
@@ -11,7 +11,7 @@
 
 # Source
 
-* [mosquitto-1.6.9.tar.gz](https://mosquitto.org/files/source/mosquitto-1.6.9.tar.gz) (319kB) ([GPG signature](https://mosquitto.org/files/source/mosquitto-1.6.9.tar.gz.asc))
+* [mosquitto-1.6.10.tar.gz](https://mosquitto.org/files/source/mosquitto-1.6.10.tar.gz) (319kB) ([GPG signature](https://mosquitto.org/files/source/mosquitto-1.6.10.tar.gz.asc))
 * [Git source code repository](https://github.com/eclipse/mosquitto) (github.com)
 
 Older downloads are available at [https://mosquitto.org/files/](../files/)
@@ -24,8 +24,8 @@ distributions.
 
 ## Windows
 
-* [mosquitto-1.6.8-install-windows-x64.exe](https://mosquitto.org/files/binary/win64/mosquitto-1.6.8-install-windows-x64.exe) (~1.4 MB) (64-bit build, Windows Vista and up, built with Visual Studio Community 2017)
-* [mosquitto-1.6.8-install-windows-x32.exe](https://mosquitto.org/files/binary/win32/mosquitto-1.6.8-install-windows-x86.exe) (~1.4 MB) (32-bit build, Windows Vista and up, built with Visual Studio Community 2017)
+* [mosquitto-1.6.10-install-windows-x64.exe](https://mosquitto.org/files/binary/win64/mosquitto-1.6.10-install-windows-x64.exe) (~1.4 MB) (64-bit build, Windows Vista and up, built with Visual Studio Community 2017)
+* [mosquitto-1.6.10-install-windows-x32.exe](https://mosquitto.org/files/binary/win32/mosquitto-1.6.10-install-windows-x86.exe) (~1.4 MB) (32-bit build, Windows Vista and up, built with Visual Studio Community 2017)
 
 See also readme-windows.txt after installing.
 
diff --git a/www/posts/2020/05/version-1-6-10-released.md b/www/posts/2020/05/version-1-6-10-released.md
index ff91b364..7ad63d95 100644
--- a/www/posts/2020/05/version-1-6-10-released.md
+++ b/www/posts/2020/05/version-1-6-10-released.md
@@ -1,6 +1,6 @@
 <!--
 .. title: Version 1.6.10 released.
-.. slug: version-1-6-8-released
+.. slug: version-1-6-10-released
 .. date: 2020-05-25 23:45:13 UTC+00:00
 .. tags: Releases
 .. category:
diff --git a/www/posts/2020/06/test-mosquitto-org-cert-updated.md b/www/posts/2020/06/test-mosquitto-org-cert-updated.md
new file mode 100644
index 00000000..611209fc
--- /dev/null
+++ b/www/posts/2020/06/test-mosquitto-org-cert-updated.md
@@ -0,0 +1,22 @@
+<!--
+.. title: test.mosquitto.org SSL cert updated
+.. slug: test-mosquitto-org-ssl-cert-updated
+.. date: 2020-06-09 12:30:13 UTC+01:00
+.. tags: Public-server
+.. category:
+.. link:
+.. description:
+.. type: text
+-->
+
+The CA certificate and server certificate for the broker running at
+[test.mosquitto.org] has been updated to use a stronger key. 
+
+This means that if you have downloaded the CA certificate, you will need to do
+so again.
+
+Likewise, if you have used the [client certificate generator] then your
+certificate will no longer be accepted and you must generate a new one.
+
+[test.mosquitto.org]: https://test.mosquitto.org
+[client certificate generator]: https://test.mosquitto.org/ssl/