diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 8228838..62ccadd 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -6,15 +6,15 @@ on:
 
 jobs:
   tests:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     strategy:
       matrix:
-        php: ['7.1', '7.2', '7.3', '7.4', '8.0', '8.1', '8.2']
+        php: ['7.1', '7.2', '7.3', '7.4', '8.0', '8.1', '8.2', '8.3', '8.4']
     name: PHP ${{ matrix.php }}
     steps:
-      -   uses: actions/checkout@v3
-      # required for "git tag" presence for MonorepoBuilder split and ChangelogLinker git tags resolver; default is 1
-      -   run: git fetch --depth=100000 origin
+      -   uses: actions/checkout@v4
+          with:
+              fetch-depth: 5
       # see https://github.com/shivammathur/setup-php
       -   uses: shivammathur/setup-php@v2
           with:
@@ -25,10 +25,11 @@ jobs:
       -   run: composer phpunit
 
   tests_lowest_dependencies:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     steps:
-      -   uses: actions/checkout@v3
-      -   run: git fetch --depth=100000 origin
+      -   uses: actions/checkout@v4
+          with:
+            fetch-depth: 5
       # see https://github.com/shivammathur/setup-php
       -   uses: shivammathur/setup-php@v2
           with:
diff --git a/composer.json b/composer.json
index 49d9d08..6124951 100644
--- a/composer.json
+++ b/composer.json
@@ -28,7 +28,7 @@
     },
     "require-dev": {
         "friendsofphp/php-cs-fixer": "^3.0",
-        "phpstan/phpstan": "^1.0",
+        "phpstan/phpstan": "^1.4",
         "phpstan/phpstan-phpunit": "^1.0",
         "phpstan/phpstan-strict-rules": "^1.0",
         "phpunit/phpunit": "^7.0 || ^8.0 || ^9.0"
diff --git a/lib/MC/Google/Visualization.php b/lib/MC/Google/Visualization.php
index fa269d7..9e42828 100644
--- a/lib/MC/Google/Visualization.php
+++ b/lib/MC/Google/Visualization.php
@@ -14,13 +14,14 @@
 use MC\Parser\Token;
 use PDO;
 use PDOException;
+use Tests\VisualizationTest;
 
 /**
  * Provide a working implementation of the Google Visualization Query data source that works with a database
  * (or any other custom backend). The documentation for the query language itself and how to use it with Google
  * Visualizations can be found here: http://code.google.com/apis/visualization/documentation/querylanguage.html.
  *
- * @see \Tests\VisualizationTest
+ * @see VisualizationTest
  *
  * @phpstan-type FieldSpec array{
  *     type: string,
@@ -106,10 +107,8 @@ class Visualization
      * Create a new instance.  This must be done before the library can be used.  Pass in a PDO connection and
      * dialect if MC_Google_Visualization will handle the entire request cycle.
      *
-     * @param null|PDO $db      the database connection to use
-     * @param string   $dialect the SQL dialect to use - one of "mysql", "postgres", or "sqlite"
-     *
-     * @phpstan-param 'mysql'|'postgres'|'sqlite' $dialect
+     * @param null|PDO                    $db      the database connection to use
+     * @param 'mysql'|'postgres'|'sqlite' $dialect the SQL dialect to use
      *
      * @throws Visualization_Error
      */
@@ -140,9 +139,7 @@ public function setDB(?PDO $db = null): void
     /**
      * Set the dialect to use when generating SQL statements.
      *
-     * @param string $dialect one of "mysql", "postgres", or "sqlite"
-     *
-     * @phpstan-param 'mysql'|'postgres'|'sqlite' $dialect
+     * @param 'mysql'|'postgres'|'sqlite' $dialect the SQL dialect to use
      *
      * @throws Visualization_Error
      */
@@ -158,11 +155,8 @@ public function setSqlDialect(string $dialect): void
     /**
      * Change the default format string to use for a particular data type.
      *
-     * @param string $type the data type to change - one of "date", "datetime", "time", "boolean", or "number"
-     *
-     * @phpstan-param 'date'|'datetime'|'time'|'boolean'|'number' $type
-     *
-     * @param string $format the format string to use for the data type
+     * @param string                                      $format the format string to use for the data type
+     * @param 'boolean'|'date'|'datetime'|'number'|'time' $type   the data type to change
      *
      * @throws Visualization_Error
      */
@@ -582,7 +576,7 @@ public function getRowValues(array $row, array $meta): string
                         $time = strtotime($year.'0104 +'.$week.' weeks');
                         assert(false !== $time);
                         $monday = strtotime('-'.((int) date('w', $time) - 1).' days', $time);
-                        assert(false !== $monday); // @phpstan-ignore-line ; PHP < 8.0
+                        assert(false !== $monday);
                         [$year, $month, $day] = explode('-', date('Y-m-d', $monday));
                         $formatted = date($format, $monday);
                     } else {
@@ -737,7 +731,7 @@ public function getGrammar(): Def
      *
      * @throws ParseError
      * @throws Visualization_QueryError
-     * @throws Parser\DefError
+     * @throws DefError
      */
     public function parseQuery(string $str): array
     {
@@ -887,7 +881,7 @@ public function parseQuery(string $str): array
      *
      * @return string the string to output that will cause the visualization client to detect an error
      */
-    protected function handleError(int $reqid, string $detailMsg, string $handler = 'google.visualization.Query.setResponse', string $code = 'error', string $summaryMsg = null): string
+    protected function handleError(int $reqid, string $detailMsg, string $handler = 'google.visualization.Query.setResponse', string $code = 'error', ?string $summaryMsg = null): string
     {
         if (null === $summaryMsg) {
             $summaryMsg = $detailMsg;
@@ -1013,7 +1007,7 @@ protected function generateSQL(array &$meta): string
             $stmt = $this->db->query($pivotSql);
             assert(false !== $stmt);
             $rows = $stmt->fetchAll(PDO::FETCH_ASSOC);
-            assert(false !== $rows); // @phpstan-ignore-line ; PHP < 8.0
+            assert(false !== $rows);
             foreach ($rows as $row) {
                 // Create a version of all function-ed fields for each unique combination of pivot values
                 foreach ($funcFields as $field) {
@@ -1292,7 +1286,7 @@ protected function getFieldQuote(): string
      *
      * @return string the SQL string for this field, with an op
      */
-    protected function getFieldSQL(string $name, array $spec, bool $alias = false, string $func = null, array $pivot = null, array $pivotFields = null): string
+    protected function getFieldSQL(string $name, array $spec, bool $alias = false, ?string $func = null, ?array $pivot = null, ?array $pivotFields = null): string
     {
         $sql = $spec['field'];
         $q = $this->getFieldQuote();
@@ -1360,7 +1354,7 @@ protected function addDependantCallbackFields(array $fieldSpec, array $entity, a
      * @param Token      $token  the token or token group to recursively parse
      * @param null|array $fields the collector array reference to receive the flattened select field values
      */
-    protected function parseFieldTokens(Token $token, array &$fields = null): void
+    protected function parseFieldTokens(Token $token, ?array &$fields = null): void
     {
         if ('*' === $token->value) {
             return;
@@ -1392,7 +1386,7 @@ protected function parseFieldTokens(Token $token, array &$fields = null): void
      * @param Token                                          $token the token or token group to parse
      * @param null|array<array{type: string, value: string}> $where the collector array of tokens that make up the where clause
      */
-    protected function parseWhereTokens(Token $token, array &$where = null): void
+    protected function parseWhereTokens(Token $token, ?array &$where = null): void
     {
         if (!is_array($where)) {
             $where = [];
diff --git a/lib/MC/Parser.php b/lib/MC/Parser.php
index 291ad9b..d862c04 100644
--- a/lib/MC/Parser.php
+++ b/lib/MC/Parser.php
@@ -14,11 +14,12 @@
 use MC\Parser\Def\Set;
 use MC\Parser\Def\Word;
 use MC\Parser\DefError;
+use Tests\ParserTest;
 
 /**
  * Parser-generator class with an easy PHP-based API, similar to the pyparsing module in philosophy.
  *
- * @see \Tests\ParserTest
+ * @see ParserTest
  */
 class Parser
 {
@@ -48,7 +49,7 @@ public function oneOf(Def ...$args): OneOf
     /**
      * Return a Word that matches a set of possible characters not separated by whitespace.
      */
-    public function word(string $firstChars, string $restChars = null): Word
+    public function word(string $firstChars, ?string $restChars = null): Word
     {
         return new Word($firstChars, $restChars);
     }
diff --git a/lib/MC/Parser/Def.php b/lib/MC/Parser/Def.php
index fe94492..c1b9bf0 100644
--- a/lib/MC/Parser/Def.php
+++ b/lib/MC/Parser/Def.php
@@ -46,11 +46,7 @@ public function parsePart(string $str, int $loc): array
     {
         [$loc, $tok] = $this->_parse($str, $loc);
 
-        $char = @$str[$loc++];
-        while (('' !== $char) && Parser::isWhitespace($char)) {
-            $char = @$str[$loc++];
-        }
-        --$loc;
+        for (; ($loc < strlen($str)) && Parser::isWhitespace($str[$loc]); ++$loc);
 
         return [$loc, $tok];
     }
diff --git a/lib/MC/Parser/Def/Regex.php b/lib/MC/Parser/Def/Regex.php
index 8a66e4e..c592eaa 100644
--- a/lib/MC/Parser/Def/Regex.php
+++ b/lib/MC/Parser/Def/Regex.php
@@ -29,7 +29,7 @@ class Regex extends Def
     /** @var int */
     public $retgroup = 0;
 
-    public function __construct(string $regex = null, string $flags = null, string $errstr = null)
+    public function __construct(?string $regex = null, ?string $flags = null, ?string $errstr = null)
     {
         if (null !== $regex) {
             $this->regex = $regex;
diff --git a/lib/MC/Parser/Def/Word.php b/lib/MC/Parser/Def/Word.php
index e8c04ac..6eadbe9 100644
--- a/lib/MC/Parser/Def/Word.php
+++ b/lib/MC/Parser/Def/Word.php
@@ -13,7 +13,7 @@ class Word extends Regex
      * @param string      $firstChars the characters allowed as the first character in the word
      * @param null|string $restChars  the characters allowed as the rest of the word - defaults to same as $first_chars
      */
-    public function __construct(string $firstChars, string $restChars = null)
+    public function __construct(string $firstChars, ?string $restChars = null)
     {
         parent::__construct();
 
diff --git a/lib/MC/Parser/DefError.php b/lib/MC/Parser/DefError.php
index 7e2d5ed..8eb55b6 100644
--- a/lib/MC/Parser/DefError.php
+++ b/lib/MC/Parser/DefError.php
@@ -4,6 +4,4 @@
 
 namespace MC\Parser;
 
-class DefError extends Error
-{
-}
+class DefError extends Error {}
diff --git a/lib/MC/Parser/Error.php b/lib/MC/Parser/Error.php
index 84588e9..80f47fb 100644
--- a/lib/MC/Parser/Error.php
+++ b/lib/MC/Parser/Error.php
@@ -6,6 +6,4 @@
 
 use Exception;
 
-class Error extends Exception
-{
-}
+class Error extends Exception {}
diff --git a/phpstan.neon b/phpstan.neon
index 9f283d1..7550d46 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -4,5 +4,5 @@ includes:
     - vendor/phpstan/phpstan-strict-rules/rules.neon
 parameters:
     checkMissingIterableValueType: false
-    reportUnmatchedIgnoredErrors: false
+    reportUnmatchedIgnoredErrors: true
     treatPhpDocTypesAsCertain: false
\ No newline at end of file
diff --git a/tests/ExampleTest.php b/tests/ExampleTest.php
index d787d34..c59c1c1 100644
--- a/tests/ExampleTest.php
+++ b/tests/ExampleTest.php
@@ -141,6 +141,10 @@ public function testQueryJoins(): void
 
         $output = $vis->handleRequest(false, $parameters);
 
+        // hack, different PHP version have different float rounding
+        $output = preg_replace('/69\.22149730656[0-9]+/', '69.22149730656', $output);
+        assert(is_string($output));
+
         // file_put_contents(__DIR__.'/result3.js', $output);
         self::assertStringEqualsFile(__DIR__.'/result3.js', $output);
     }
diff --git a/tests/result3.js b/tests/result3.js
index 86c87b6..5a0d0b8 100644
--- a/tests/result3.js
+++ b/tests/result3.js
@@ -1 +1 @@
-google.visualization.Query.setResponse({version:'0.5',reqId:'3',status:'ok',table:{cols: [{id:'max-life_male',label:"Life Expectancy (Male)",type:'number'},{id:'avg-life_female',label:"Life Expectancy (Female)",type:'number'},{id:'min-life_both',label:"Life Expectancy (Combined)",type:'number'}],rows: [{c:[{v:82.15,f:"82.15 years"},{v:69.2214973065625,f:"69.22 years"},{v:0,f:"0.00 years"}]}]}});
\ No newline at end of file
+google.visualization.Query.setResponse({version:'0.5',reqId:'3',status:'ok',table:{cols: [{id:'max-life_male',label:"Life Expectancy (Male)",type:'number'},{id:'avg-life_female',label:"Life Expectancy (Female)",type:'number'},{id:'min-life_both',label:"Life Expectancy (Combined)",type:'number'}],rows: [{c:[{v:82.15,f:"82.15 years"},{v:69.22149730656,f:"69.22 years"},{v:0,f:"0.00 years"}]}]}});
\ No newline at end of file