diff --git a/Gemfile.lock b/Gemfile.lock
index 2274a151d..591ecee6d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -142,12 +142,12 @@ GEM
       plek (>= 1.9.0)
       rack (>= 2.2.0)
       rest-client (~> 2.0)
-    gds-sso (19.0.0)
+    gds-sso (19.1.0)
       oauth2 (~> 2.0)
       omniauth (~> 2.1)
       omniauth-oauth2 (~> 1.8)
-      plek (>= 4, < 6)
-      rails (>= 6)
+      plek (>= 5)
+      rails (>= 7)
       warden (~> 1.2)
       warden-oauth2 (~> 0.0.1)
     globalid (1.2.1)
@@ -698,7 +698,7 @@ GEM
       execjs (>= 0.3.0, < 3)
     unicode-display_width (2.5.0)
     uri (0.13.0)
-    version_gem (1.1.3)
+    version_gem (1.1.4)
     warden (1.2.9)
       rack (>= 2.0.9)
     warden-oauth2 (0.0.1)
diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index b6df9b66f..67bd4bb87 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -50,7 +50,7 @@ def ensure_user_can_access_tagathon_tools!
   end
 
   def deny_access_to(subject)
-    raise PermissionDeniedException, "Sorry, you are not authorised to access this #{subject}."
+    raise PermissionDeniedError, "Sorry, you are not authorised to access this #{subject}."
   end
 
   def permission_checker