diff --git a/composer.lock b/composer.lock
index a4c8751b..20d4273d 100644
--- a/composer.lock
+++ b/composer.lock
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+                "php": "^5.5.9|>=7.0.8"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "4.1-dev"
+                    "dev-master": "3.4-dev"
                 }
             },
             "autoload": {
@@ -2559,7 +2611,7 @@
                 "configuration",
                 "options"
             ],
-            "time": "2018-09-18T12:45:12+00:00"
+            "time": "2018-09-17T17:29:18+00:00"
         },
         {
             "name": "symfony/polyfill-ctype",
@@ -2794,25 +2846,25 @@
         },
         {
             "name": "symfony/process",
-            "version": "v4.1.7",
+            "version": "v3.4.18",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/process.git",
-                "reference": "3e83acef94d979b1de946599ef86b3a352abcdc9"
+                "reference": "35c2914a9f50519bd207164c353ae4d59182c2cb"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/process/zipball/3e83acef94d979b1de946599ef86b3a352abcdc9",
-                "reference": "3e83acef94d979b1de946599ef86b3a352abcdc9",
+                "url": "https://api.github.com/repos/symfony/process/zipball/35c2914a9f50519bd207164c353ae4d59182c2cb",
+                "reference": "35c2914a9f50519bd207164c353ae4d59182c2cb",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.1.3"
+                "php": "^5.5.9|>=7.0.8"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "4.1-dev"
+                    "dev-master": "3.4-dev"
                 }
             },
             "autoload": {
@@ -2839,29 +2891,29 @@
             ],
             "description": "Symfony Process Component",
             "homepage": "https://symfony.com",
-            "time": "2018-10-14T20:48:13+00:00"
+            "time": "2018-10-14T17:33:21+00:00"
         },
         {
             "name": "symfony/stopwatch",
-            "version": "v4.1.7",
+            "version": "v3.4.18",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/stopwatch.git",
-                "reference": "5bfc064125b73ff81229e19381ce1c34d3416f4b"
+                "reference": "05e52a39de52ba690aebaed462b2bc8a9649f0a4"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/stopwatch/zipball/5bfc064125b73ff81229e19381ce1c34d3416f4b",
-                "reference": "5bfc064125b73ff81229e19381ce1c34d3416f4b",
+                "url": "https://api.github.com/repos/symfony/stopwatch/zipball/05e52a39de52ba690aebaed462b2bc8a9649f0a4",
+                "reference": "05e52a39de52ba690aebaed462b2bc8a9649f0a4",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.1.3"
+                "php": "^5.5.9|>=7.0.8"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "4.1-dev"
+                    "dev-master": "3.4-dev"
                 }
             },
             "autoload": {
@@ -2888,24 +2940,24 @@
             ],
             "description": "Symfony Stopwatch Component",
             "homepage": "https://symfony.com",
-            "time": "2018-10-02T12:40:59+00:00"
+            "time": "2018-10-02T12:28:39+00:00"
         },
         {
             "name": "symfony/yaml",
-            "version": "v4.1.7",
+            "version": "v3.4.18",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/yaml.git",
-                "reference": "367e689b2fdc19965be435337b50bc8adf2746c9"
+                "reference": "640b6c27fed4066d64b64d5903a86043f4a4de7f"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/yaml/zipball/367e689b2fdc19965be435337b50bc8adf2746c9",
-                "reference": "367e689b2fdc19965be435337b50bc8adf2746c9",
+                "url": "https://api.github.com/repos/symfony/yaml/zipball/640b6c27fed4066d64b64d5903a86043f4a4de7f",
+                "reference": "640b6c27fed4066d64b64d5903a86043f4a4de7f",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.1.3",
+                "php": "^5.5.9|>=7.0.8",
                 "symfony/polyfill-ctype": "~1.8"
             },
             "conflict": {
@@ -2920,7 +2972,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "4.1-dev"
+                    "dev-master": "3.4-dev"
                 }
             },
             "autoload": {
@@ -2947,7 +2999,7 @@
             ],
             "description": "Symfony Yaml Component",
             "homepage": "https://symfony.com",
-            "time": "2018-10-02T16:36:10+00:00"
+            "time": "2018-10-02T16:33:53+00:00"
         },
         {
             "name": "tecnickcom/tcpdf",
@@ -3085,4 +3137,4 @@
         "ext-zlib": "*"
     },
     "platform-dev": []
-}
+}
\ No newline at end of file
diff --git a/src/PhpSpreadsheet/Reader/Security/XmlScanner.php b/src/PhpSpreadsheet/Reader/Security/XmlScanner.php
index 3c8c4209..1bc6060e 100644
--- a/src/PhpSpreadsheet/Reader/Security/XmlScanner.php
+++ b/src/PhpSpreadsheet/Reader/Security/XmlScanner.php
@@ -21,13 +21,13 @@ class XmlScanner
         $this->libxmlDisableEntityLoader = $this->identifyLibxmlDisableEntityLoaderAvailability();
 
         if ($this->libxmlDisableEntityLoader) {
-            libxml_disable_entity_loader(false);
+            libxml_disable_entity_loader(true);
         }
     }
 
     private function identifyLibxmlDisableEntityLoaderAvailability()
     {
-        if (PHP_MAJOR_VERSION > 7) {
+        if (PHP_MAJOR_VERSION == 7) {
             switch (PHP_MINOR_VERSION) {
                 case 2:
                     return PHP_RELEASE_VERSION >= 1;