diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index bab4133cff..9e1062a125 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -5,9 +5,9 @@ on:
   pull_request:
 
 jobs:
-  tests_70:
+  tests_71:
     runs-on: "ubuntu-latest"
-    name: "PHP 7.0 Unit Tests"
+    name: "PHP 7.1 Unit Tests"
     steps:
       - name: "Checkout"
         uses: "actions/checkout@v3"
@@ -15,7 +15,7 @@ jobs:
         uses: "shivammathur/setup-php@v2"
         with:
           coverage: "xdebug"
-          php-version: "7.0"
+          php-version: "7.1"
           tools: composer:v2
       - name: "Install dependencies"
         run: |
@@ -34,7 +34,6 @@ jobs:
     strategy:
       matrix:
         php-version:
-          - "7.1"
           - "7.2"
           - "7.3"
           - "7.4"
@@ -71,9 +70,9 @@ jobs:
         run: "composer update --no-progress --prefer-dist"
       - name: "Tests"
         run: "test_old/run-php-src.sh 7.3.21"
-  test_old_80_70:
+  test_old_80_71:
     runs-on: "ubuntu-latest"
-    name: "PHP 8.1 Code on PHP 7.0 Integration Tests"
+    name: "PHP 8.1 Code on PHP 7.1 Integration Tests"
     steps:
       - name: "Checkout"
         uses: "actions/checkout@v3"
@@ -81,7 +80,7 @@ jobs:
         uses: "shivammathur/setup-php@v2"
         with:
           coverage: "none"
-          php-version: "7.0"
+          php-version: "7.1"
           tools: composer:v2
       - name: "Install PHP 8 dependencies"
         run: "composer update --no-progress --prefer-dist"
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5aa1986696..b0e2bd3fee 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,11 @@
+Version 4.19.0 (2024-MM-DD)
+---------------------------
+
+### Changed
+
+* Do not use implicitly nullable parameters
+* PHP 7.0 is no longer supported
+
 Version 4.18.0 (2023-12-10)
 ---------------------------
 
diff --git a/composer.json b/composer.json
index 2fd064a212..9a3e1a9761 100644
--- a/composer.json
+++ b/composer.json
@@ -13,7 +13,7 @@
         }
     ],
     "require": {
-        "php": ">=7.0",
+        "php": ">=7.1",
         "ext-tokenizer": "*"
     },
     "require-dev": {
diff --git a/lib/PhpParser/ConstExprEvaluator.php b/lib/PhpParser/ConstExprEvaluator.php
index 7131c3d255..ceb3f11f3d 100644
--- a/lib/PhpParser/ConstExprEvaluator.php
+++ b/lib/PhpParser/ConstExprEvaluator.php
@@ -37,7 +37,7 @@ class ConstExprEvaluator
      *
      * @param callable|null $fallbackEvaluator To call if subexpression cannot be evaluated
      */
-    public function __construct(callable $fallbackEvaluator = null) {
+    public function __construct(?callable $fallbackEvaluator = null) {
         $this->fallbackEvaluator = $fallbackEvaluator ?? function(Expr $expr) {
             throw new ConstExprEvaluationException(
                 "Expression of type {$expr->getType()} cannot be evaluated"
diff --git a/lib/PhpParser/Internal/PrintableNewAnonClassNode.php b/lib/PhpParser/Internal/PrintableNewAnonClassNode.php
index 6763227014..917ed1e854 100644
--- a/lib/PhpParser/Internal/PrintableNewAnonClassNode.php
+++ b/lib/PhpParser/Internal/PrintableNewAnonClassNode.php
@@ -31,7 +31,7 @@ class PrintableNewAnonClassNode extends Expr
     public $stmts;
 
     public function __construct(
-        array $attrGroups, int $flags, array $args, Node\Name $extends = null, array $implements,
+        array $attrGroups, int $flags, array $args, ?Node\Name $extends = null, array $implements,
         array $stmts, array $attributes
     ) {
         parent::__construct($attributes);
diff --git a/lib/PhpParser/Lexer.php b/lib/PhpParser/Lexer.php
index e15dd0a5d2..60b809b8b1 100644
--- a/lib/PhpParser/Lexer.php
+++ b/lib/PhpParser/Lexer.php
@@ -69,7 +69,7 @@ public function __construct(array $options = []) {
      * @param ErrorHandler|null $errorHandler Error handler to use for lexing errors. Defaults to
      *                                        ErrorHandler\Throwing
      */
-    public function startLexing(string $code, ErrorHandler $errorHandler = null) {
+    public function startLexing(string $code, ?ErrorHandler $errorHandler = null) {
         if (null === $errorHandler) {
             $errorHandler = new ErrorHandler\Throwing();
         }
diff --git a/lib/PhpParser/Lexer/Emulative.php b/lib/PhpParser/Lexer/Emulative.php
index b0929f3ccb..a0e781d04d 100644
--- a/lib/PhpParser/Lexer/Emulative.php
+++ b/lib/PhpParser/Lexer/Emulative.php
@@ -74,7 +74,7 @@ public function __construct(array $options = [])
         }
     }
 
-    public function startLexing(string $code, ErrorHandler $errorHandler = null) {
+    public function startLexing(string $code, ?ErrorHandler $errorHandler = null) {
         $emulators = array_filter($this->emulators, function($emulator) use($code) {
             return $emulator->isEmulationNeeded($code);
         });
diff --git a/lib/PhpParser/NameContext.php b/lib/PhpParser/NameContext.php
index 777a4afdee..82c5acc2c7 100644
--- a/lib/PhpParser/NameContext.php
+++ b/lib/PhpParser/NameContext.php
@@ -36,7 +36,7 @@ public function __construct(ErrorHandler $errorHandler) {
      *
      * @param Name|null $namespace Null is the global namespace
      */
-    public function startNamespace(Name $namespace = null) {
+    public function startNamespace(?Name $namespace = null) {
         $this->namespace = $namespace;
         $this->origAliases = $this->aliases = [
             Stmt\Use_::TYPE_NORMAL   => [],
diff --git a/lib/PhpParser/Node/Arg.php b/lib/PhpParser/Node/Arg.php
index bcf130e68c..17e6802607 100644
--- a/lib/PhpParser/Node/Arg.php
+++ b/lib/PhpParser/Node/Arg.php
@@ -27,7 +27,7 @@ class Arg extends NodeAbstract
      */
     public function __construct(
         Expr $value, bool $byRef = false, bool $unpack = false, array $attributes = [],
-        Identifier $name = null
+        ?Identifier $name = null
     ) {
         $this->attributes = $attributes;
         $this->name = $name;
diff --git a/lib/PhpParser/Node/Expr/ArrayDimFetch.php b/lib/PhpParser/Node/Expr/ArrayDimFetch.php
index 71694478e9..46db975c4c 100644
--- a/lib/PhpParser/Node/Expr/ArrayDimFetch.php
+++ b/lib/PhpParser/Node/Expr/ArrayDimFetch.php
@@ -18,7 +18,7 @@ class ArrayDimFetch extends Expr
      * @param null|Expr $dim        Array index / dim
      * @param array     $attributes Additional attributes
      */
-    public function __construct(Expr $var, Expr $dim = null, array $attributes = []) {
+    public function __construct(Expr $var, ?Expr $dim = null, array $attributes = []) {
         $this->attributes = $attributes;
         $this->var = $var;
         $this->dim = $dim;
diff --git a/lib/PhpParser/Node/Expr/ArrayItem.php b/lib/PhpParser/Node/Expr/ArrayItem.php
index 1b078f8218..5aaa9867ee 100644
--- a/lib/PhpParser/Node/Expr/ArrayItem.php
+++ b/lib/PhpParser/Node/Expr/ArrayItem.php
@@ -23,7 +23,7 @@ class ArrayItem extends Expr
      * @param bool      $byRef      Whether to assign by reference
      * @param array     $attributes Additional attributes
      */
-    public function __construct(Expr $value, Expr $key = null, bool $byRef = false, array $attributes = [], bool $unpack = false) {
+    public function __construct(Expr $value, ?Expr $key = null, bool $byRef = false, array $attributes = [], bool $unpack = false) {
         $this->attributes = $attributes;
         $this->key = $key;
         $this->value = $value;
diff --git a/lib/PhpParser/Node/Expr/Exit_.php b/lib/PhpParser/Node/Expr/Exit_.php
index b88a8f7e6f..5469b8e4ca 100644
--- a/lib/PhpParser/Node/Expr/Exit_.php
+++ b/lib/PhpParser/Node/Expr/Exit_.php
@@ -19,7 +19,7 @@ class Exit_ extends Expr
      * @param null|Expr $expr       Expression
      * @param array                    $attributes Additional attributes
      */
-    public function __construct(Expr $expr = null, array $attributes = []) {
+    public function __construct(?Expr $expr = null, array $attributes = []) {
         $this->attributes = $attributes;
         $this->expr = $expr;
     }
diff --git a/lib/PhpParser/Node/Expr/Yield_.php b/lib/PhpParser/Node/Expr/Yield_.php
index aef8fc333d..f15336edeb 100644
--- a/lib/PhpParser/Node/Expr/Yield_.php
+++ b/lib/PhpParser/Node/Expr/Yield_.php
@@ -18,7 +18,7 @@ class Yield_ extends Expr
      * @param null|Expr $key        Key expression
      * @param array     $attributes Additional attributes
      */
-    public function __construct(Expr $value = null, Expr $key = null, array $attributes = []) {
+    public function __construct(?Expr $value = null, ?Expr $key = null, array $attributes = []) {
         $this->attributes = $attributes;
         $this->key = $key;
         $this->value = $value;
diff --git a/lib/PhpParser/Node/Name.php b/lib/PhpParser/Node/Name.php
index f0a564ff0b..0d6e4b1ff5 100644
--- a/lib/PhpParser/Node/Name.php
+++ b/lib/PhpParser/Node/Name.php
@@ -162,7 +162,7 @@ public function __toString() : string {
      *
      * @return static|null Sliced name
      */
-    public function slice(int $offset, int $length = null) {
+    public function slice(int $offset, ?int $length = null) {
         $numParts = count($this->parts);
 
         $realOffset = $offset < 0 ? $offset + $numParts : $offset;
diff --git a/lib/PhpParser/Node/Param.php b/lib/PhpParser/Node/Param.php
index 1e90b79441..dfb77f6290 100644
--- a/lib/PhpParser/Node/Param.php
+++ b/lib/PhpParser/Node/Param.php
@@ -34,7 +34,7 @@ class Param extends NodeAbstract
      * @param AttributeGroup[]                        $attrGroups PHP attribute groups
      */
     public function __construct(
-        $var, Expr $default = null, $type = null,
+        $var, ?Expr $default = null, $type = null,
         bool $byRef = false, bool $variadic = false,
         array $attributes = [],
         int $flags = 0,
diff --git a/lib/PhpParser/Node/Stmt/Break_.php b/lib/PhpParser/Node/Stmt/Break_.php
index 6adc5a6c6f..d9464a1ae8 100644
--- a/lib/PhpParser/Node/Stmt/Break_.php
+++ b/lib/PhpParser/Node/Stmt/Break_.php
@@ -15,7 +15,7 @@ class Break_ extends Node\Stmt
      * @param null|Node\Expr $num        Number of loops to break
      * @param array          $attributes Additional attributes
      */
-    public function __construct(Node\Expr $num = null, array $attributes = []) {
+    public function __construct(?Node\Expr $num = null, array $attributes = []) {
         $this->attributes = $attributes;
         $this->num = $num;
     }
diff --git a/lib/PhpParser/Node/Stmt/Catch_.php b/lib/PhpParser/Node/Stmt/Catch_.php
index 9b9c094782..5d7b5c0168 100644
--- a/lib/PhpParser/Node/Stmt/Catch_.php
+++ b/lib/PhpParser/Node/Stmt/Catch_.php
@@ -23,7 +23,7 @@ class Catch_ extends Node\Stmt
      * @param array                 $attributes Additional attributes
      */
     public function __construct(
-        array $types, Expr\Variable $var = null, array $stmts = [], array $attributes = []
+        array $types, ?Expr\Variable $var = null, array $stmts = [], array $attributes = []
     ) {
         $this->attributes = $attributes;
         $this->types = $types;
diff --git a/lib/PhpParser/Node/Stmt/Continue_.php b/lib/PhpParser/Node/Stmt/Continue_.php
index 24882683b3..f2b30d79f5 100644
--- a/lib/PhpParser/Node/Stmt/Continue_.php
+++ b/lib/PhpParser/Node/Stmt/Continue_.php
@@ -15,7 +15,7 @@ class Continue_ extends Node\Stmt
      * @param null|Node\Expr $num        Number of loops to continue
      * @param array          $attributes Additional attributes
      */
-    public function __construct(Node\Expr $num = null, array $attributes = []) {
+    public function __construct(?Node\Expr $num = null, array $attributes = []) {
         $this->attributes = $attributes;
         $this->num = $num;
     }
diff --git a/lib/PhpParser/Node/Stmt/Declare_.php b/lib/PhpParser/Node/Stmt/Declare_.php
index f46ff0bafd..a3a5bfaa59 100644
--- a/lib/PhpParser/Node/Stmt/Declare_.php
+++ b/lib/PhpParser/Node/Stmt/Declare_.php
@@ -18,7 +18,7 @@ class Declare_ extends Node\Stmt
      * @param Node\Stmt[]|null $stmts      Statements
      * @param array            $attributes Additional attributes
      */
-    public function __construct(array $declares, array $stmts = null, array $attributes = []) {
+    public function __construct(array $declares, ?array $stmts = null, array $attributes = []) {
         $this->attributes = $attributes;
         $this->declares = $declares;
         $this->stmts = $stmts;
diff --git a/lib/PhpParser/Node/Stmt/EnumCase.php b/lib/PhpParser/Node/Stmt/EnumCase.php
index 5beff8b39f..4b1079bcd7 100644
--- a/lib/PhpParser/Node/Stmt/EnumCase.php
+++ b/lib/PhpParser/Node/Stmt/EnumCase.php
@@ -20,7 +20,7 @@ class EnumCase extends Node\Stmt
      * @param AttributeGroup[]          $attrGroups PHP attribute groups
      * @param array                     $attributes Additional attributes
      */
-    public function __construct($name, Node\Expr $expr = null, array $attrGroups = [], array $attributes = []) {
+    public function __construct($name, ?Node\Expr $expr = null, array $attrGroups = [], array $attributes = []) {
         parent::__construct($attributes);
         $this->name = \is_string($name) ? new Node\Identifier($name) : $name;
         $this->expr = $expr;
diff --git a/lib/PhpParser/Node/Stmt/Namespace_.php b/lib/PhpParser/Node/Stmt/Namespace_.php
index c63204577c..fc249161a9 100644
--- a/lib/PhpParser/Node/Stmt/Namespace_.php
+++ b/lib/PhpParser/Node/Stmt/Namespace_.php
@@ -22,7 +22,7 @@ class Namespace_ extends Node\Stmt
      * @param null|Node\Stmt[] $stmts      Statements
      * @param array            $attributes Additional attributes
      */
-    public function __construct(Node\Name $name = null, $stmts = [], array $attributes = []) {
+    public function __construct(?Node\Name $name = null, $stmts = [], array $attributes = []) {
         $this->attributes = $attributes;
         $this->name = $name;
         $this->stmts = $stmts;
diff --git a/lib/PhpParser/Node/Stmt/PropertyProperty.php b/lib/PhpParser/Node/Stmt/PropertyProperty.php
index 205731e20e..286b42961c 100644
--- a/lib/PhpParser/Node/Stmt/PropertyProperty.php
+++ b/lib/PhpParser/Node/Stmt/PropertyProperty.php
@@ -18,7 +18,7 @@ class PropertyProperty extends Node\Stmt
      * @param null|Node\Expr                $default    Default value
      * @param array                         $attributes Additional attributes
      */
-    public function __construct($name, Node\Expr $default = null, array $attributes = []) {
+    public function __construct($name, ?Node\Expr $default = null, array $attributes = []) {
         $this->attributes = $attributes;
         $this->name = \is_string($name) ? new Node\VarLikeIdentifier($name) : $name;
         $this->default = $default;
diff --git a/lib/PhpParser/Node/Stmt/Return_.php b/lib/PhpParser/Node/Stmt/Return_.php
index efc578c58f..53731254c0 100644
--- a/lib/PhpParser/Node/Stmt/Return_.php
+++ b/lib/PhpParser/Node/Stmt/Return_.php
@@ -15,7 +15,7 @@ class Return_ extends Node\Stmt
      * @param null|Node\Expr $expr       Expression
      * @param array          $attributes Additional attributes
      */
-    public function __construct(Node\Expr $expr = null, array $attributes = []) {
+    public function __construct(?Node\Expr $expr = null, array $attributes = []) {
         $this->attributes = $attributes;
         $this->expr = $expr;
     }
diff --git a/lib/PhpParser/Node/Stmt/StaticVar.php b/lib/PhpParser/Node/Stmt/StaticVar.php
index 29584560d3..0cc47b4122 100644
--- a/lib/PhpParser/Node/Stmt/StaticVar.php
+++ b/lib/PhpParser/Node/Stmt/StaticVar.php
@@ -20,7 +20,7 @@ class StaticVar extends Node\Stmt
      * @param array          $attributes Additional attributes
      */
     public function __construct(
-        Expr\Variable $var, Node\Expr $default = null, array $attributes = []
+        Expr\Variable $var, ?Node\Expr $default = null, array $attributes = []
     ) {
         $this->attributes = $attributes;
         $this->var = $var;
diff --git a/lib/PhpParser/Node/Stmt/TryCatch.php b/lib/PhpParser/Node/Stmt/TryCatch.php
index 7fc158c570..74e004380b 100644
--- a/lib/PhpParser/Node/Stmt/TryCatch.php
+++ b/lib/PhpParser/Node/Stmt/TryCatch.php
@@ -21,7 +21,7 @@ class TryCatch extends Node\Stmt
      * @param null|Finally_ $finally    Optional finally node
      * @param array         $attributes Additional attributes
      */
-    public function __construct(array $stmts, array $catches, Finally_ $finally = null, array $attributes = []) {
+    public function __construct(array $stmts, array $catches, ?Finally_ $finally = null, array $attributes = []) {
         $this->attributes = $attributes;
         $this->stmts = $stmts;
         $this->catches = $catches;
diff --git a/lib/PhpParser/NodeDumper.php b/lib/PhpParser/NodeDumper.php
index ba622efd12..e0c7f783ad 100644
--- a/lib/PhpParser/NodeDumper.php
+++ b/lib/PhpParser/NodeDumper.php
@@ -39,7 +39,7 @@ public function __construct(array $options = []) {
      *
      * @return string Dumped value
      */
-    public function dump($node, string $code = null) : string {
+    public function dump($node, ?string $code = null) : string {
         $this->code = $code;
         return $this->dumpRecursive($node);
     }
diff --git a/lib/PhpParser/NodeVisitor/NameResolver.php b/lib/PhpParser/NodeVisitor/NameResolver.php
index 83f3ea831c..dd2e9ca766 100644
--- a/lib/PhpParser/NodeVisitor/NameResolver.php
+++ b/lib/PhpParser/NodeVisitor/NameResolver.php
@@ -35,7 +35,7 @@ class NameResolver extends NodeVisitorAbstract
      * @param ErrorHandler|null $errorHandler Error handler
      * @param array $options Options
      */
-    public function __construct(ErrorHandler $errorHandler = null, array $options = []) {
+    public function __construct(?ErrorHandler $errorHandler = null, array $options = []) {
         $this->nameContext = new NameContext($errorHandler ?? new ErrorHandler\Throwing);
         $this->preserveOriginalNames = $options['preserveOriginalNames'] ?? false;
         $this->replaceNodes = $options['replaceNodes'] ?? true;
@@ -164,7 +164,7 @@ public function enterNode(Node $node) {
         return null;
     }
 
-    private function addAlias(Stmt\UseUse $use, int $type, Name $prefix = null) {
+    private function addAlias(Stmt\UseUse $use, int $type, ?Name $prefix = null) {
         // Add prefix for group uses
         $name = $prefix ? Name::concat($prefix, $use->name) : $use->name;
         // Type is determined either by individual element or whole use declaration
diff --git a/lib/PhpParser/Parser.php b/lib/PhpParser/Parser.php
index 8956c76718..7236c68e2a 100644
--- a/lib/PhpParser/Parser.php
+++ b/lib/PhpParser/Parser.php
@@ -14,5 +14,5 @@ interface Parser
      * @return Node\Stmt[]|null Array of statements (or null non-throwing error handler is used and
      *                          the parser was unable to recover from an error).
      */
-    public function parse(string $code, ErrorHandler $errorHandler = null);
+    public function parse(string $code, ?ErrorHandler $errorHandler = null);
 }
diff --git a/lib/PhpParser/Parser/Multiple.php b/lib/PhpParser/Parser/Multiple.php
index 77fd1f3fbb..083ff465d3 100644
--- a/lib/PhpParser/Parser/Multiple.php
+++ b/lib/PhpParser/Parser/Multiple.php
@@ -24,7 +24,7 @@ public function __construct(array $parsers) {
         $this->parsers = $parsers;
     }
 
-    public function parse(string $code, ErrorHandler $errorHandler = null) {
+    public function parse(string $code, ?ErrorHandler $errorHandler = null) {
         if (null === $errorHandler) {
             $errorHandler = new ErrorHandler\Throwing;
         }
diff --git a/lib/PhpParser/ParserAbstract.php b/lib/PhpParser/ParserAbstract.php
index 9f9d00c763..567e09a975 100644
--- a/lib/PhpParser/ParserAbstract.php
+++ b/lib/PhpParser/ParserAbstract.php
@@ -155,7 +155,7 @@ public function __construct(Lexer $lexer, array $options = []) {
      * @return Node\Stmt[]|null Array of statements (or null non-throwing error handler is used and
      *                          the parser was unable to recover from an error).
      */
-    public function parse(string $code, ErrorHandler $errorHandler = null) {
+    public function parse(string $code, ?ErrorHandler $errorHandler = null) {
         $this->errorHandler = $errorHandler ?: new ErrorHandler\Throwing;
 
         $this->lexer->startLexing($code, $this->errorHandler);
diff --git a/lib/PhpParser/ParserFactory.php b/lib/PhpParser/ParserFactory.php
index baba23bdb4..98b0aee343 100644
--- a/lib/PhpParser/ParserFactory.php
+++ b/lib/PhpParser/ParserFactory.php
@@ -21,7 +21,7 @@ class ParserFactory
      *
      * @return Parser The parser instance
      */
-    public function create(int $kind, Lexer $lexer = null, array $parserOptions = []) : Parser {
+    public function create(int $kind, ?Lexer $lexer = null, array $parserOptions = []) : Parser {
         if (null === $lexer) {
             $lexer = new Lexer\Emulative();
         }