diff --git a/src/ChurchCRM/Authentication/AuthenticationManager.php b/src/ChurchCRM/Authentication/AuthenticationManager.php
index fd1d393b4c..94d53ae5f6 100644
--- a/src/ChurchCRM/Authentication/AuthenticationManager.php
+++ b/src/ChurchCRM/Authentication/AuthenticationManager.php
@@ -61,7 +61,7 @@ public static function endSession(bool $preventRedirect = false): void
         $currentSessionUserName = 'Unknown';
 
         try {
-            if (self::getCurrentUser() !== null) {
+            if (self::getCurrentUser() instanceof User) {
                 $currentSessionUserName = self::getCurrentUser()->getName();
             }
         } catch (\Exception $e) {
diff --git a/src/ChurchCRM/Authentication/AuthenticationProviders/LocalAuthentication.php b/src/ChurchCRM/Authentication/AuthenticationProviders/LocalAuthentication.php
index 49e4db7561..ed8829180a 100644
--- a/src/ChurchCRM/Authentication/AuthenticationProviders/LocalAuthentication.php
+++ b/src/ChurchCRM/Authentication/AuthenticationProviders/LocalAuthentication.php
@@ -169,7 +169,7 @@ public function validateUserSessionIsActive(bool $updateLastOperationTimestamp):
         $authenticationResult = new AuthenticationResult();
 
         // First check to see if a `user` key exists on the session.
-        if (null === $this->currentUser) {
+        if (!$this->currentUser instanceof User) {
             $authenticationResult->isAuthenticated = false;
             LoggerUtils::getAuthLogger()->debug('No active user session.');
 
diff --git a/src/ChurchCRM/Reports/PDF_Directory.php b/src/ChurchCRM/Reports/PDF_Directory.php
index 076bfb7ec1..c843bfc831 100644
--- a/src/ChurchCRM/Reports/PDF_Directory.php
+++ b/src/ChurchCRM/Reports/PDF_Directory.php
@@ -256,7 +256,7 @@ public function printName($sName): void
         $this->SetFont($this->_Font, '', $this->_Char_Size);
     }
 
-    public function sGetCustomString($rsCustomFields, $aRow)
+    public function sGetCustomString($rsCustomFields, $aRow): string
     {
         $numCustomFields = mysqli_num_rows($rsCustomFields);
         if ($numCustomFields > 0) {
diff --git a/src/ChurchCRM/Service/SystemService.php b/src/ChurchCRM/Service/SystemService.php
index 52b54b36b1..aacfc42374 100644
--- a/src/ChurchCRM/Service/SystemService.php
+++ b/src/ChurchCRM/Service/SystemService.php
@@ -60,7 +60,7 @@ public static function getDBServerVersion()
         }
     }
 
-    public static function getPrerequisiteStatus()
+    public static function getPrerequisiteStatus(): string
     {
         if (AppIntegrityService::arePrerequisitesMet()) {
             return 'All Prerequisites met';
@@ -161,7 +161,7 @@ public static function getMaxUploadFileSize($humanFormat = true)
         }
     }
 
-    private static function parseSize(string $size)
+    private static function parseSize(string $size): float
     {
         $unit = preg_replace('/[^bkmgtpezy]/i', '', $size); // Remove the non-unit characters from the size.
         $size = preg_replace('/[^0-9\.]/', '', $size); // Remove the non-numeric characters from the size.
diff --git a/src/ChurchCRM/dto/SystemURLs.php b/src/ChurchCRM/dto/SystemURLs.php
index 344aaa0d56..1743014487 100644
--- a/src/ChurchCRM/dto/SystemURLs.php
+++ b/src/ChurchCRM/dto/SystemURLs.php
@@ -52,7 +52,7 @@ public static function getURLs()
         return self::$urls;
     }
 
-    public static function getSupportURL($topic = '')
+    public static function getSupportURL($topic = ''): string
     {
         $supportURLs = [
             'HttpsTask'                     => 'https://github.com/ChurchCRM/CRM/wiki/SSL',
diff --git a/src/ChurchCRM/model/ChurchCRM/Person.php b/src/ChurchCRM/model/ChurchCRM/Person.php
index 2419b3a4e7..ba935aa33c 100644
--- a/src/ChurchCRM/model/ChurchCRM/Person.php
+++ b/src/ChurchCRM/model/ChurchCRM/Person.php
@@ -639,7 +639,7 @@ public function getAge(?\DateTimeInterface $now = null): string
     {
         $birthDate = $this->getBirthDate();
 
-        if ($birthDate === null || $this->hideAge()) {
+        if (!$birthDate instanceof \DateTimeImmutable || $this->hideAge()) {
             return false;
         }
         if (!$now instanceof \DateTimeInterface) {
@@ -657,7 +657,7 @@ public function getAge(?\DateTimeInterface $now = null): string
     public function getNumericAge(): int
     {
         $birthDate = $this->getBirthDate();
-        if ($birthDate === null || $this->hideAge()) {
+        if (!$birthDate instanceof \DateTimeImmutable || $this->hideAge()) {
             return false;
         }
         if (empty($now)) {
diff --git a/src/ChurchCRM/model/ChurchCRM/User.php b/src/ChurchCRM/model/ChurchCRM/User.php
index 8d4a0e18b5..3d9819ce00 100644
--- a/src/ChurchCRM/model/ChurchCRM/User.php
+++ b/src/ChurchCRM/model/ChurchCRM/User.php
@@ -411,7 +411,7 @@ public function getNewTwoFARecoveryCodes(): array
         return $recoveryCodes;
     }
 
-    public function isTwoFACodeValid($twoFACode)
+    public function isTwoFACodeValid($twoFACode): bool
     {
         $google2fa = new Google2FA();
         $window = 2; //TODO: make this a system config
diff --git a/src/ChurchCRM/utils/GeoUtils.php b/src/ChurchCRM/utils/GeoUtils.php
index c702362796..7464a6fc18 100644
--- a/src/ChurchCRM/utils/GeoUtils.php
+++ b/src/ChurchCRM/utils/GeoUtils.php
@@ -37,12 +37,10 @@ public static function getLatLong(string $address): array
             $geoCoder = new StatefulGeocoder($provider, $localeInfo->getShortLocale());
             $result = $geoCoder->geocodeQuery(GeocodeQuery::create($address));
             $logger->debug('We have ' . $result->count() . ' results');
-            if ($result instanceof Collection) {
-                $firstResult = $result->get(0);
-                $coordinates = $firstResult->getCoordinates();
-                $lat = $coordinates->getLatitude();
-                $long = $coordinates->getLongitude();
-            }
+            $firstResult = $result->get(0);
+            $coordinates = $firstResult->getCoordinates();
+            $lat = $coordinates->getLatitude();
+            $long = $coordinates->getLongitude();
         } catch (\Exception $exception) {
             $logger->warning('issue creating geoCoder ' . $exception->getMessage());
         }
diff --git a/src/ChurchCRM/utils/InputUtils.php b/src/ChurchCRM/utils/InputUtils.php
index ec05575337..ce7e639211 100644
--- a/src/ChurchCRM/utils/InputUtils.php
+++ b/src/ChurchCRM/utils/InputUtils.php
@@ -52,7 +52,7 @@ public static function filterFloat($sInput): float
         return (float) floatval(trim($sInput));
     }
 
-    public static function filterDate($sInput)
+    public static function filterDate($sInput): string
     {
         // Attempts to take a date in any format and convert it to YYYY-MM-DD format
         // Logel Philippe
diff --git a/src/ChurchCRM/utils/LoggerUtils.php b/src/ChurchCRM/utils/LoggerUtils.php
index 53b29bfdc4..9e4ebbd749 100644
--- a/src/ChurchCRM/utils/LoggerUtils.php
+++ b/src/ChurchCRM/utils/LoggerUtils.php
@@ -10,11 +10,11 @@
 class LoggerUtils
 {
     private static ?Logger $appLogger = null;
-    private static ?\Monolog\Handler\StreamHandler $appLogHandler = null;
+    private static ?StreamHandler $appLogHandler = null;
     private static ?Logger $cspLogger = null;
     private static ?Logger $authLogger = null;
     private static ?Logger $slimLogger = null;
-    private static ?\Monolog\Handler\StreamHandler $authLogHandler = null;
+    private static ?StreamHandler $authLogHandler = null;
     private static ?string $correlationId = null;
 
     public static function getCorrelationId(): ?string
@@ -37,7 +37,7 @@ public static function buildLogFilePath(string $type): string
     }
     public static function getSlimMVCLogger(): Logger
     {
-        if (self::$slimLogger === null) {
+        if (!self::$slimLogger instanceof Logger) {
             $slimLogger = new Logger('slim-app');
             $streamHandler = new StreamHandler(self::buildLogFilePath('slim'), SystemConfig::getValue('sLogLevel'));
             $slimLogger->pushHandler($streamHandler);
@@ -52,7 +52,7 @@ public static function getSlimMVCLogger(): Logger
      */
     public static function getAppLogger($level = null): ?Logger
     {
-        if (self::$appLogger === null) {
+        if (!self::$appLogger instanceof Logger) {
             // if $level is null
             // (meaning this function was invoked without explicitly setting the level),
             //  then get the level from the database
@@ -94,7 +94,7 @@ private static function getCaller(): array
      */
     public static function getAuthLogger($level = null): ?Logger
     {
-        if (self::$authLogger === null) {
+        if (!self::$authLogger instanceof Logger) {
             // if $level is null
             // (meaning this function was invoked without explicitly setting the level),
             //  then get the level from the database
@@ -128,7 +128,7 @@ public static function resetAppLoggerLevel(): void
 
     public static function getCSPLogger(): ?Logger
     {
-        if (self::$cspLogger === null) {
+        if (!self::$cspLogger instanceof Logger) {
             self::$cspLogger = new Logger('cspLogger');
             self::$cspLogger->pushHandler(new StreamHandler(self::buildLogFilePath('csp'), self::getLogLevel()));
         }
diff --git a/src/Include/Functions.php b/src/Include/Functions.php
index 6b176bc965..56241b2b8a 100644
--- a/src/Include/Functions.php
+++ b/src/Include/Functions.php
@@ -412,7 +412,7 @@ function FormatDate($dDate, $bWithTime = false): string
     }
 }
 
-function AlternateRowStyle($sCurrentStyle)
+function AlternateRowStyle($sCurrentStyle): string
 {
     if ($sCurrentStyle == 'RowColorA') {
         return 'RowColorB';
@@ -443,7 +443,7 @@ function ConvertToBoolean($sInput)
     }
 }
 
-function ConvertFromBoolean($sInput)
+function ConvertFromBoolean($sInput): int
 {
     if ($sInput) {
         return 1;
diff --git a/src/composer.json b/src/composer.json
index 110377f2b0..b1d874edbd 100644
--- a/src/composer.json
+++ b/src/composer.json
@@ -87,7 +87,7 @@
     },
     "require-dev": {
         "phpstan/phpstan": "^1.10",
-        "rector/rector": "^0.18.5",
+        "rector/rector": "^0.19.0",
         "squizlabs/php_codesniffer": "^3.7"
     }
-}
\ No newline at end of file
+}
diff --git a/src/composer.lock b/src/composer.lock
index 8792c82353..00bb3bdf1e 100644
--- a/src/composer.lock
+++ b/src/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "7443d059b2c76abd77c341a31ce46de3",
+    "content-hash": "dc558cbf73a7ee2cb3932ec72d81ef64",
     "packages": [
         {
             "name": "azuyalabs/yasumi",
@@ -5458,16 +5458,16 @@
     "packages-dev": [
         {
             "name": "phpstan/phpstan",
-            "version": "1.10.50",
+            "version": "1.10.55",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpstan/phpstan.git",
-                "reference": "06a98513ac72c03e8366b5a0cb00750b487032e4"
+                "reference": "9a88f9d18ddf4cf54c922fbeac16c4cb164c5949"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/06a98513ac72c03e8366b5a0cb00750b487032e4",
-                "reference": "06a98513ac72c03e8366b5a0cb00750b487032e4",
+                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/9a88f9d18ddf4cf54c922fbeac16c4cb164c5949",
+                "reference": "9a88f9d18ddf4cf54c922fbeac16c4cb164c5949",
                 "shasum": ""
             },
             "require": {
@@ -5516,25 +5516,25 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2023-12-13T10:59:42+00:00"
+            "time": "2024-01-08T12:32:40+00:00"
         },
         {
             "name": "rector/rector",
-            "version": "0.18.13",
+            "version": "0.19.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/rectorphp/rector.git",
-                "reference": "f8011a76d36aa4f839f60f3b4f97707d97176618"
+                "reference": "503f4ead06b3892bd106f67f3c86d4e36c94423d"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/rectorphp/rector/zipball/f8011a76d36aa4f839f60f3b4f97707d97176618",
-                "reference": "f8011a76d36aa4f839f60f3b4f97707d97176618",
+                "url": "https://api.github.com/repos/rectorphp/rector/zipball/503f4ead06b3892bd106f67f3c86d4e36c94423d",
+                "reference": "503f4ead06b3892bd106f67f3c86d4e36c94423d",
                 "shasum": ""
             },
             "require": {
                 "php": "^7.2|^8.0",
-                "phpstan/phpstan": "^1.10.35"
+                "phpstan/phpstan": "^1.10.52"
             },
             "conflict": {
                 "rector/rector-doctrine": "*",
@@ -5564,7 +5564,7 @@
             ],
             "support": {
                 "issues": "https://github.com/rectorphp/rector/issues",
-                "source": "https://github.com/rectorphp/rector/tree/0.18.13"
+                "source": "https://github.com/rectorphp/rector/tree/0.19.0"
             },
             "funding": [
                 {
@@ -5572,7 +5572,7 @@
                     "type": "github"
                 }
             ],
-            "time": "2023-12-20T16:08:01+00:00"
+            "time": "2024-01-09T00:49:06+00:00"
         },
         {
             "name": "squizlabs/php_codesniffer",
diff --git a/src/rector.php b/src/rector.php
index 8c0d42c5b4..756af79816 100644
--- a/src/rector.php
+++ b/src/rector.php
@@ -36,5 +36,6 @@
         LevelSetList::UP_TO_PHP_74,
         SetList::GMAGICK_TO_IMAGICK,
         SetList::TYPE_DECLARATION,
+        SetList::INSTANCEOF,
     ]);
 };