diff --git a/tests/Canonicals/Providers/ProtonmailTest.php b/tests/Canonicals/Providers/ProtonmailTest.php
index 51648c5..95b7521 100644
--- a/tests/Canonicals/Providers/ProtonmailTest.php
+++ b/tests/Canonicals/Providers/ProtonmailTest.php
@@ -52,6 +52,10 @@ public function test_get_canonical(): void
             ['user.name+tag', 'pm.me', 'user.name+tag', 'protonmail.com'],
             ['user.name', 'proton.me', 'user.name', 'protonmail.com'],
             ['user.name', 'pm.me', 'user.name', 'protonmail.com'],
+            // Uppercase sensitivity
+            ['MyMail777', 'proton.me', 'mymail777', 'protonmail.com'],
+            ['MYMAIL777', 'proton.me', 'mymail777', 'protonmail.com'],
+            ['mymail777', 'proton.me', 'mymail777', 'protonmail.com'],
         ];
 
         foreach ($testCases as [$inputLocal, $inputDomain, $expectedLocal, $expectedDomain]) {
diff --git a/tests/EmailTest.php b/tests/EmailTest.php
index 0e42ceb..5749c19 100644
--- a/tests/EmailTest.php
+++ b/tests/EmailTest.php
@@ -561,6 +561,7 @@ public function test_get_unique_protonmail_aliases(): void
             // Other ProtonMail domains
             ['user.name+tag@proton.me', 'user.name+tag@protonmail.com'],
             ['user.name+tag@pm.me', 'user.name+tag@protonmail.com'],
+            ['mymail777@proton.me', 'mymail777@protonmail.com'],
             ['u.s.e.r.n.a.m.e@protonmail.com', 'u.s.e.r.n.a.m.e@protonmail.com'],
             ['u.s.e.r.n.a.m.e+tag@protonmail.com', 'u.s.e.r.n.a.m.e+tag@protonmail.com'],
             // Edge cases
@@ -733,6 +734,9 @@ public function test_get_unique_case_sensitivity(): void
             ['USER.NAME+TAG@PROTONMAIL.COM', 'user.name+tag@protonmail.com'],
             ['User.Name+Tag@Protonmail.Com', 'user.name+tag@protonmail.com'],
             ['user.name+tag@Protonmail.com', 'user.name+tag@protonmail.com'],
+            ['MYMAIL777@PROTON.ME', 'mymail777@protonmail.com'],
+            ['MyMail777@Proton.Me', 'mymail777@protonmail.com'],
+            ['mymail777@proton.me', 'mymail777@protonmail.com'],
             ['USER.NAME+TAG@FASTMAIL.COM', 'user.name+tag@fastmail.com'],
             ['User.Name+Tag@Fastmail.Com', 'user.name+tag@fastmail.com'],
             ['user.name+tag@Fastmail.com', 'user.name+tag@fastmail.com'],