diff --git a/app/config.py b/app/config.py
index f0be4d0fe..77138ca16 100644
--- a/app/config.py
+++ b/app/config.py
@@ -38,7 +38,7 @@ class Config(object):
     NR_MONITOR_ON = settings and settings.monitor_mode
     COMMIT_HASH = getenv("COMMIT_HASH", "--------")[0:7]
 
-    GOVERNMENT_EMAIL_DOMAIN_NAMES = ["gov", "mil", "is.edu"]
+    GOVERNMENT_EMAIL_DOMAIN_NAMES = ["gov", "mil", "si.edu"]
 
     # Logging
     NOTIFY_LOG_LEVEL = getenv("NOTIFY_LOG_LEVEL", "INFO")
diff --git a/tests/app/main/views/test_register.py b/tests/app/main/views/test_register.py
index 076d1e876..19d8c5a4b 100644
--- a/tests/app/main/views/test_register.py
+++ b/tests/app/main/views/test_register.py
@@ -148,7 +148,7 @@ def test_should_return_200_when_email_is_not_gov_uk(
     "email_address",
     [
         "notfound@example.gsa.gov",
-        "example@lsquo.is.edu",
+        "example@lsquo.si.edu",
     ],
 )
 def test_should_add_user_details_to_session(