diff --git a/.travis.yml b/.travis.yml
index 4b4b159..aee8455 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,7 +2,7 @@ sudo: required
 language: generic
 services: docker
 env:
-- HHVM_VERSION=4.73-latest
+- HHVM_VERSION=4.78-latest
 - HHVM_VERSION=latest
 - HHVM_VERSION=nightly
 install:
diff --git a/composer.json b/composer.json
index 4f5b8ff..5b1c92b 100644
--- a/composer.json
+++ b/composer.json
@@ -10,7 +10,7 @@
     }
   },
   "require": {
-    "hhvm": "^4.73",
+    "hhvm": "^4.78",
     "hhvm/hhvm-autoload": "^2.0|^3.0",
     "hhvm/hsl": "^4.0",
     "hhvm/type-assert": "^3.2|^4.0",