diff --git a/.travis.yml b/.travis.yml
index 74621ea3f..047a67836 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,6 +6,10 @@ before_script:
   - rm composer.lock
   - travis_retry composer update --prefer-dist $DEPENDENCIES
 
+matrix:
+  allow_failures:
+    - php: 7.4snapshot
+
 jobs:
   include:
     - stage: Test
@@ -76,6 +80,16 @@ jobs:
         - echo "memory_limit=1G" >> /c/tools/php/php.ini
       script: vendor/bin/phpunit
 
+    - stage: Test
+      php: 7.4snapshot
+      env: DEPENDENCIES=""
+      script: vendor/bin/phpunit
+
+    - stage: Test
+      php: 7.4snapshot
+      env: DEPENDENCIES="--prefer-lowest --prefer-stable"
+      script: vendor/bin/phpunit
+
     - stage: Test Compatibility
       php: 7.2
       env: DEPENDENCIES=""
@@ -144,6 +158,16 @@ jobs:
         - echo "memory_limit=1G" >> /c/tools/php/php.ini
       script: vendor/bin/phpunit test/compat
 
+    - stage: Test Compatibility
+      php: 7.4snapshot
+      env: DEPENDENCIES=""
+      script: vendor/bin/phpunit test/compat
+
+    - stage: Test Compatibility
+      php: 7.4snapshot
+      env: DEPENDENCIES="--prefer-lowest --prefer-stable"
+      script: vendor/bin/phpunit test/compat
+
     - stage: Check Demo Scripts
       php: 7.2
       env: DEPENDENCIES=""
@@ -164,6 +188,16 @@ jobs:
       env: DEPENDENCIES="--prefer-lowest --prefer-stable"
       script: test/demo/check-demo.sh
 
+    - stage: Check Demo Scripts
+      php: 7.4snapshot
+      env: DEPENDENCIES=""
+      script: test/demo/check-demo.sh
+
+    - stage: Check Demo Scripts
+      php: 7.4snapshot
+      env: DEPENDENCIES="--prefer-lowest --prefer-stable"
+      script: test/demo/check-demo.sh
+
     - stage: Check Coding Standard
       php: 7.3
       env: DEPENDENCIES=""
diff --git a/composer.json b/composer.json
index 7159846dc..877af92b0 100644
--- a/composer.json
+++ b/composer.json
@@ -3,7 +3,7 @@
     "description": "Better Reflection - an improved code reflection API",
     "license": "MIT",
     "require": {
-        "php": ">=7.2.0,<7.4.0",
+        "php": ">=7.2.0,<7.5.0",
         "ext-json": "*",
         "jetbrains/phpstorm-stubs": "2019.1",
         "nikic/php-parser": "^4.2.1",
diff --git a/test/unit/SourceLocator/SourceStubber/PhpStormStubsSourceStubberTest.php b/test/unit/SourceLocator/SourceStubber/PhpStormStubsSourceStubberTest.php
index 0b58ec9da..db5cd3884 100644
--- a/test/unit/SourceLocator/SourceStubber/PhpStormStubsSourceStubberTest.php
+++ b/test/unit/SourceLocator/SourceStubber/PhpStormStubsSourceStubberTest.php
@@ -79,13 +79,20 @@ public function internalClassesProvider() : array
             get_declared_traits()
         );
 
+        // Needs fixes in JetBrains/phpstorm-stubs
+        $missingClassesInStubs = ['WeakReference'];
+
         return array_map(
             static function (string $className) : array {
                 return [$className];
             },
             array_filter(
                 $classNames,
-                static function (string $className) : bool {
+                static function (string $className) use ($missingClassesInStubs) : bool {
+                    if (in_array($className, $missingClassesInStubs, true)) {
+                        return false;
+                    }
+
                     $reflection = new CoreReflectionClass($className);
 
                     if (! $reflection->isInternal()) {
@@ -159,6 +166,11 @@ private function assertSameClassAttributes(CoreReflectionClass $original, Reflec
                 continue;
             }
 
+            // Added in PHP 7.4.0
+            if (PHP_VERSION_ID >= 70400 && $method->getShortName() === '__unserialize') {
+                return;
+            }
+
             $this->assertSameMethodAttributes($method, $stubbed->getMethod($method->getName()));
         }
 
@@ -272,7 +284,7 @@ public function internalFunctionsProvider() : array
         $functionNames = get_defined_functions()['internal'];
 
         // Needs fixes in JetBrains/phpstorm-stubs
-        $missingFunctionsInStubs = ['sapi_windows_vt100_support'];
+        $missingFunctionsInStubs = ['password_algos', 'sapi_windows_vt100_support', 'sapi_windows_set_ctrl_handler', 'sapi_windows_generate_ctrl_event'];
 
         return array_map(
             static function (string $functionName) : array {
@@ -361,6 +373,11 @@ public function testInternalFunctions(string $functionName) : void
             return;
         }
 
+        // Changed in PHP 7.4.0
+        if (PHP_VERSION_ID >= 70400 && $functionName === 'preg_replace_callback') {
+            return;
+        }
+
         // Needs fixes in JetBrains/phpstorm-stubs or PHP
         if (in_array($functionName, ['get_resources', 'sapi_windows_cp_get', 'stream_context_set_option'], true)) {
             return;