diff --git a/README.md b/README.md
index 743954d..463da46 100644
--- a/README.md
+++ b/README.md
@@ -13,7 +13,7 @@ Plugin for PHP_CodeSniffer static analysis tool that adds analysis of problemati
 
 ### Requirements
 
-VariableAnalysis requires PHP 5.4 or higher and [PHP CodeSniffer](https://github.com/squizlabs/PHP_CodeSniffer) version 3.5.0 or higher.
+VariableAnalysis requires PHP 5.4 or higher and [PHP CodeSniffer](https://github.com/squizlabs/PHP_CodeSniffer) version 3.5.6 or higher.
 
 ### With PHPCS Composer Installer
 
diff --git a/composer.circleci.json b/composer.circleci.json
index 675ee84..b406664 100644
--- a/composer.circleci.json
+++ b/composer.circleci.json
@@ -38,7 +38,7 @@
     },
     "require" : {
         "php" : ">=5.4.0",
-        "squizlabs/php_codesniffer": "^3.1"
+        "squizlabs/php_codesniffer": "^3.5.6"
     },
     "require-dev": {
         "phpunit/phpunit": "^4.0 || ^5.0 || ^6.5 || ^7.0 || ^8.0"
diff --git a/composer.json b/composer.json
index 814f828..e622b18 100644
--- a/composer.json
+++ b/composer.json
@@ -43,7 +43,7 @@
     },
     "require" : {
         "php" : ">=5.4.0",
-        "squizlabs/php_codesniffer": "^3.5"
+        "squizlabs/php_codesniffer": "^3.5.6"
     },
     "require-dev": {
         "phpunit/phpunit": "^5.0 || ^6.5 || ^7.0 || ^8.0",