diff --git a/composer.json b/composer.json
index 248fb4a..f71bcf2 100644
--- a/composer.json
+++ b/composer.json
@@ -26,7 +26,7 @@
         "illuminate/container": "5.5.*|5.6.*|5.7.*",
         "illuminate/support": "5.5.*|5.6.*|5.7.*",
         "illuminate/validation": "5.5.*|5.6.*|5.7.*",
-        "twilio/sdk": "~5.19.0"
+        "twilio/sdk": "~5.21.4"
     },
     "require-dev": {
         "graham-campbell/testbench": "^4.0|^5.0",