diff --git a/composer.json b/composer.json
index 435d8ab..03a21c0 100644
--- a/composer.json
+++ b/composer.json
@@ -21,10 +21,10 @@
         }
     ],
     "require": {
-        "php": ">=7.3",
+        "php": "^7.3 || ^8.0",
         "phpunit/phpunit": "^9.5",
         "squizlabs/php_codesniffer": "^3",
-        "behat/behat": "^3.2",
+        "behat/behat": "^3.9",
         "behat/mink": "^1.7",
         "behat/mink-extension": "^2.1",
         "silverstripe/mink-facebook-web-driver": "^1",
diff --git a/src/Context/EmailContext.php b/src/Context/EmailContext.php
index b30180b..16c712f 100644
--- a/src/Context/EmailContext.php
+++ b/src/Context/EmailContext.php
@@ -130,9 +130,9 @@ class EmailContext implements Context
         }
 
         if (trim($negate)) {
-            Assert::assertNotContains($content, $emailContent);
+            Assert::assertStringNotContainsString($content, $emailContent);
         } else {
-            Assert::assertContains($content, $emailContent);
+            Assert::assertStringContainsString($content, $emailContent);
         }
     }
 
@@ -156,7 +156,7 @@ class EmailContext implements Context
         $emailPlainText = strip_tags($emailContent);
         $emailPlainText = preg_replace("/\h+/", " ", $emailPlainText);
 
-        Assert::assertContains($content, $emailPlainText);
+        Assert::assertStringContainsString($content, $emailPlainText);
     }
 
     /**
@@ -265,11 +265,11 @@ class EmailContext implements Context
         // For "should not contain"
         if (trim($negate)) {
             foreach ($rows as $row) {
-                Assert::assertNotContains($row[0], $emailContent);
+                Assert::assertStringNotContainsString($row[0], $emailContent);
             }
         } else {
             foreach ($rows as $row) {
-                Assert::assertContains($row[0], $emailContent);
+                Assert::assertStringContainsString($row[0], $emailContent);
             }
         }
     }
@@ -307,9 +307,9 @@ class EmailContext implements Context
 
         $match = $this->lastMatchedEmail;
         if (trim($negate)) {
-            Assert::assertNotContains($from, $match->From);
+            Assert::assertStringNotContainsString($from, $match->From);
         } else {
-            Assert::assertContains($from, $match->From);
+            Assert::assertStringContainsString($from, $match->From);
         }
     }
 
@@ -326,9 +326,9 @@ class EmailContext implements Context
 
         $match = $this->lastMatchedEmail;
         if (trim($negate)) {
-            Assert::assertNotContains($to, $match->To);
+            Assert::assertStringNotContainsString($to, $match->To);
         } else {
-            Assert::assertContains($to, $match->To);
+            Assert::assertStringContainsString($to, $match->To);
         }
     }