diff --git a/lib/validationData.php b/lib/validationData.php
index 97f5efddc2f2c4606e6632e65de761c354bf8f94..1adca763de65a9fc72700481d40d949e3f34c45c 100644
--- a/lib/validationData.php
+++ b/lib/validationData.php
@@ -22,6 +22,7 @@ function lookup_postcode($postcode = "")
         curl_setopt($req, CURLOPT_REFERER, $referer);
         curl_setopt($req, CURLOPT_RETURNTRANSFER, true);
         curl_setopt($req, CURLOPT_SSL_VERIFYPEER, false);
+        curl_setopt($req, CURLOPT_SSLVERSION, 3);
         $page = curl_exec($req);
         curl_close($req);