diff --git a/composer.json b/composer.json
index 7a8f27a..bca0add 100644
--- a/composer.json
+++ b/composer.json
@@ -18,20 +18,20 @@
 		}
 	],
 	"require": {
-		"fisharebest/ext-calendar": "~2.2",
-		"jakeasmith/http_build_url": "~0.1",
-		"symfony/polyfill-apcu": "1.1.*",
-		"symfony/polyfill-php54": "1.1.*",
-		"symfony/polyfill-php55": "1.1.*",
-		"symfony/polyfill-php56": "1.1.*",
-		"symfony/polyfill-php70": "1.1.*",
-		"symfony/polyfill-iconv": "1.1.*",
-		"symfony/polyfill-intl-grapheme": "1.1.*",
-		"symfony/polyfill-intl-icu": "1.1.*",
-		"symfony/polyfill-intl-normalizer": "1.1.*",
-		"symfony/polyfill-mbstring": "1.1.*",
-		"symfony/polyfill-util": "1.1.*",
-		"symfony/polyfill-xml": "1.1.*"
+		"fisharebest/ext-calendar": "~2.4",
+		"jakeasmith/http_build_url": "1.0.*",
+		"symfony/polyfill-apcu": "1.8.*",
+		"symfony/polyfill-php54": "1.8.*",
+		"symfony/polyfill-php55": "1.8.*",
+		"symfony/polyfill-php56": "1.8.*",
+		"symfony/polyfill-php70": "1.8.*",
+		"symfony/polyfill-iconv": "1.8.*",
+		"symfony/polyfill-intl-grapheme": "1.8.*",
+		"symfony/polyfill-intl-icu": "1.8.*",
+		"symfony/polyfill-intl-normalizer": "1.8.*",
+		"symfony/polyfill-mbstring": "1.8.*",
+		"symfony/polyfill-util": "1.8.*",
+		"symfony/polyfill-xml": "1.8.*"
 	},
 	"require-dev": {
 		"phpunit/phpunit": "*",