diff --git a/src/Control/Email/Email.php b/src/Control/Email/Email.php
index f71db1b7a..504937a3d 100644
--- a/src/Control/Email/Email.php
+++ b/src/Control/Email/Email.php
@@ -19,6 +19,7 @@ use SilverStripe\View\SSViewer;
 use SilverStripe\View\ThemeResourceLoader;
 use SilverStripe\View\ViewableData;
 use Swift_Message;
+use Swift_Mime_SimpleMessage;
 use Swift_MimePart;
 
 /**
@@ -260,7 +261,10 @@ class Email extends ViewableData
     public function getSwiftMessage()
     {
         if (!$this->swiftMessage) {
-            $this->setSwiftMessage(new Swift_Message(null, null, 'text/html', 'utf-8'));
+            $message = new Swift_Message(null, null, 'text/html', 'utf-8');
+            // Set priority to fix PHP 8.1 SimpleMessage::getPriority() sscanf() null parameter
+            $message->setPriority(Swift_Mime_SimpleMessage::PRIORITY_NORMAL);
+            $this->setSwiftMessage($message);
         }
 
         return $this->swiftMessage;
diff --git a/src/ORM/FieldType/DBText.php b/src/ORM/FieldType/DBText.php
index a0df9b793..2ded132db 100644
--- a/src/ORM/FieldType/DBText.php
+++ b/src/ORM/FieldType/DBText.php
@@ -213,7 +213,7 @@ class DBText extends DBString
         $position = empty($keywords) ? 0 : (int) mb_stripos($text, $keywords);
 
         // We want to search string to be in the middle of our block to give it some context
-        $position = max(0, $position - ($characters / 2));
+        $position = floor(max(0, $position - ($characters / 2)));
 
         if ($position > 0) {
             // We don't want to start mid-word
diff --git a/src/ORM/Queries/SQLConditionalExpression.php b/src/ORM/Queries/SQLConditionalExpression.php
index b4f4bb2c0..b470df3c4 100644
--- a/src/ORM/Queries/SQLConditionalExpression.php
+++ b/src/ORM/Queries/SQLConditionalExpression.php
@@ -384,7 +384,7 @@ abstract class SQLConditionalExpression extends SQLExpression
             return;
         }
         // Split the array in half
-        $halfway = count($array) / 2;
+        $halfway = floor(count($array) / 2);
         $array1 = array_slice($array, 0, $halfway);
         $array2 = array_slice($array, $halfway);
         // Recurse to sort the two halves
diff --git a/tests/php/Forms/DateFieldTest.php b/tests/php/Forms/DateFieldTest.php
index 55bbb15ab..9b05d1edd 100644
--- a/tests/php/Forms/DateFieldTest.php
+++ b/tests/php/Forms/DateFieldTest.php
@@ -46,12 +46,12 @@ class DateFieldTest extends SapphireTest
     {
         $f = new DateField('Date');
         $f->setMinDate('-7 days');
-        $f->setValue(strftime('%Y-%m-%d', strtotime('-8 days', DBDatetime::now()->getTimestamp())));
+        $f->setValue(date('Y-m-d', strtotime('-8 days', DBDatetime::now()->getTimestamp())));
         $this->assertFalse($f->validate(new RequiredFields()), 'Date below min date, with strtotime');
 
         $f = new DateField('Date');
         $f->setMinDate('-7 days');
-        $f->setValue(strftime('%Y-%m-%d', strtotime('-7 days', DBDatetime::now()->getTimestamp())));
+        $f->setValue(date('Y-m-d', strtotime('-7 days', DBDatetime::now()->getTimestamp())));
         $this->assertTrue($f->validate(new RequiredFields()), 'Date matching min date, with strtotime');
     }
 
@@ -59,12 +59,12 @@ class DateFieldTest extends SapphireTest
     {
         $f = new DateField('Date');
         $f->setMaxDate('7 days');
-        $f->setValue(strftime('%Y-%m-%d', strtotime('8 days', DBDatetime::now()->getTimestamp())));
+        $f->setValue(date('Y-m-d', strtotime('8 days', DBDatetime::now()->getTimestamp())));
         $this->assertFalse($f->validate(new RequiredFields()), 'Date above max date, with strtotime');
 
         $f = new DateField('Date');
         $f->setMaxDate('7 days');
-        $f->setValue(strftime('%Y-%m-%d', strtotime('7 days', DBDatetime::now()->getTimestamp())));
+        $f->setValue(date('Y-m-d', strtotime('7 days', DBDatetime::now()->getTimestamp())));
         $this->assertTrue($f->validate(new RequiredFields()), 'Date matching max date, with strtotime');
     }