diff --git a/phpBB/composer.lock b/phpBB/composer.lock
index 9345d07dbf..0e042c3b2d 100644
--- a/phpBB/composer.lock
+++ b/phpBB/composer.lock
@@ -346,19 +346,20 @@
         },
         {
             "name": "marc1706/fast-image-size",
-            "version": "v1.1.3",
+            "version": "v1.1.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/marc1706/fast-image-size.git",
-                "reference": "5f7e8377746524e2b8a49a631c1fc9afeb9d8bee"
+                "reference": "c4ded0223a4e49ae45a2183a69f6afac5baf7250"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/marc1706/fast-image-size/zipball/5f7e8377746524e2b8a49a631c1fc9afeb9d8bee",
-                "reference": "5f7e8377746524e2b8a49a631c1fc9afeb9d8bee",
+                "url": "https://api.github.com/repos/marc1706/fast-image-size/zipball/c4ded0223a4e49ae45a2183a69f6afac5baf7250",
+                "reference": "c4ded0223a4e49ae45a2183a69f6afac5baf7250",
                 "shasum": ""
             },
             "require": {
+                "ext-mbstring": "*",
                 "php": ">=5.3.0"
             },
             "require-dev": {
@@ -393,7 +394,7 @@
                 "php",
                 "size"
             ],
-            "time": "2017-03-26 12:48:28"
+            "time": "2017-10-23 18:52:01"
         },
         {
             "name": "ocramius/proxy-manager",