diff --git a/src/registrar/templates/emails/transition_domain_invitation.txt b/src/registrar/templates/emails/transition_domain_invitation.txt
index bdce7d107..b6773d9e9 100644
--- a/src/registrar/templates/emails/transition_domain_invitation.txt
+++ b/src/registrar/templates/emails/transition_domain_invitation.txt
@@ -60,5 +60,5 @@ The .gov team
 Domain management <https://manage.get.gov>
 Get.gov <https://get.gov>
 
-The .gov registry is a part of the Cybersecurity and Infrastructure Security Agency (CISA) <http://cisa.gov/>
+The .gov registry is a part of the Cybersecurity and Infrastructure Security Agency (CISA) <https://cisa.gov/>
 {% endautoescape %}