diff --git a/.github/workflows/build-and-test.yml b/.github/workflows/build-and-test.yml
index ccd9be8..dc7c5cf 100644
--- a/.github/workflows/build-and-test.yml
+++ b/.github/workflows/build-and-test.yml
@@ -13,7 +13,7 @@ jobs:
       matrix:
         os: [ ubuntu ]
         hhvm:
-          - '4.45'
+          - '4.56'
           - latest
           - nightly
     runs-on: ${{matrix.os}}-latest
diff --git a/composer.json b/composer.json
index 53f154e..19469b0 100644
--- a/composer.json
+++ b/composer.json
@@ -3,7 +3,7 @@
   "description": "Unit test helpers for Facebook projects",
   "license": "MIT",
   "require": {
-    "hhvm": "^4.45",
+    "hhvm": "^4.56",
     "hhvm/hacktest": "^1.0|^2.0",
     "hhvm/hsl": "^4.0",
     "facebook/difflib": "^1.0.0"