diff --git a/composer.json b/composer.json
index 3a249e7..e03dcef 100644
--- a/composer.json
+++ b/composer.json
@@ -11,13 +11,13 @@
     ],
     "require": {
         "guzzlehttp/guzzle": "^6.3|^7.0",
-        "PHP": "^7.1|^8.0",
+        "PHP": "^7.2|^8.0",
         "kornrunner/keccak": "~1.0",
-        "phpseclib/phpseclib": "~2.0.11",
+        "phpseclib/phpseclib": "~2.0.30",
         "ext-mbstring": "*"
     },
     "require-dev": {
-        "phpunit/phpunit": "~6.0|~8.0"
+        "phpunit/phpunit": "~8.0|~9.0"
     },
     "autoload": {
         "psr-4": {
diff --git a/phpunit.xml b/phpunit.xml
index 3748540..5cbe216 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -7,8 +7,7 @@
          convertNoticesToExceptions="true"
          convertWarningsToExceptions="true"
          processIsolation="false"
-         stopOnFailure="false"
-         syntaxCheck="false">
+         stopOnFailure="false">
 
     <testsuite name="Web3.php unit test">
         <directory suffix="Test.php">./test/unit</directory>