To send SMS messages after 1 April 2026, your browser must use TLS 1.3 or higher when connecting to ClickSend.
This update is mandatory and ensures you remain secure.
Deadline: 31 March 2026
Please update your browser before 31 March 2026.
From 1 April 2026, browsers using lower TLS versions will stop working for ClickSend Dashboard SMS delivery and specific region based requests.
About TLS
What it is
Transport Layer Security (TLS) is a widely used security protocol that protects data as it moves over the internet.
TLS encrypts the connection between systems—such as your browser and a website, or your software and our API—so that sensitive information cannot be intercepted. TLS can also secure email, messaging, and VoIP communications.
Why this matters
Using outdated TLS versions puts your account and data at serious risk, including:
Account compromise
Data leaks
Unauthorised system access
Upgrading to TLS 1.3 ensures your communications with ClickSend remain secure and compliant.
TLS 1.3 & Why it is Required
Stronger encryption: TLS 1.3 includes modern security improvements to protect data in transit.
Regulatory compliance: Some regions now mandate TLS1.3 or higher. This ensure you stay compliance
Compatibility: After 31 March 2026, older TLS versions will no longer connect to ClickSend services for SMS.
Identify What You Need To Do
What you need to update will depend on how you connect to ClickSend.
Device Based
1. Click Here to Read about Outdated Operating Systems (OS)
1. Click Here to Read about Outdated Operating Systems (OS)
If your computer is running an outdated OS:
You may need to upgrade your operating system (e.g. upgrade to Windows 11).
Older operating systems may not support newer TLS versions even if the browser is updated.
If this applies to you, follow the Instructions for Outdated Operating Systems
2. Click Here to Read about Outdated Browsers
2. Click Here to Read about Outdated Browsers
If you log in through a browser:
Install the latest software updates on your computer.
Ensure you are using the most recent version of your web browser.
Most modern browsers support TLS 1.3 automatically once updated.
If this applies to you, follow the Instructions for Outdated Browsers
Instructions
1. Older Operating Systems (OS)
If you’re on an old OS like Windows 7 or outdated mobile OS, the browser may not support the newest TLS even after updating.
You may need to update the OS.
2. How to update browser to support TLS 1.3 or higher
To use TLS 1.3 or higher, you don’t “install TLS” separately you update your web browser (or operating system, if it’s very old) because modern browsers include TLS 1.3 support by default.
Here’s how to make sure your browser is using TLS 1.3:
2a. Update Your Browser to the Latest Version
Google Chrome
Google Chrome
Open Chrome.
Click the three dots ⋮ in the top-right corner.
Go to Help → About Google Chrome.
Chrome will check for updates and install them.
Relaunch the browser.
Chrome has supported TLS 1.3 since version 70+.
Mozilla Firefox
Mozilla Firefox
Open Firefox.
Click the menu ☰ in the top-right.
Go to Help → About Firefox.
Firefox will automatically check for and install updates.
Restart the browser.
Firefox has supported TLS 1.3 since version 63+.
Microsoft Edge (Chromium)
Microsoft Edge (Chromium)
Open Edge.
Click the three dots ⋮ → Help and feedback → About Microsoft Edge.
Edge will update automatically.
Relaunch the browser.
Edge supports TLS 1.3 in current versions.
Safari (Mac)
Safari (Mac)
Open System Settings → General → Software Update.
Install any macOS updates available.
Safari updates are included with macOS updates.
Modern Safari supports TLS 1.3 by default.
2b. Check That TLS 1.3 Is Enabled (Optional)
Test Your TLS Version, After updating, you can verify TLS 1.3 is working by visiting:
SSL Labs test: https://www.ssllabs.com/ssltest/viewMyClient.html
It will show which TLS versions your browser supports.
Most browsers enable it by default, but you can check:
Chrome / Edge
Chrome / Edge
In the address bar, go to: chrome://flags/#tls13-variant
Ensure it’s Default or Enabled.
Restart the browser.
Firefox
Firefox
In the address bar, go to: about:config
Search for tls.version.max.
Ensure the value is 4 (TLS 1.3):
4 = TLS 1.3
3 = TLS 1.2
3. Sending to Singapore?
If you send SMS to Singapore via API, Automated Sending, Application, integration, or servers, please follow this article: link here
Need Help?
We’re here 24/7.
Chat with us anytime at clicksend.com/help