diff --git a/Core/composer.json b/Core/composer.json
index 5c526a903bd1..834efbfdfd9f 100644
--- a/Core/composer.json
+++ b/Core/composer.json
@@ -21,7 +21,7 @@
         "phpdocumentor/reflection": "^5.3.3||^6.0",
         "phpdocumentor/reflection-docblock": "^5.3",
         "erusev/parsedown": "^1.6",
-        "opis/closure": "^3",
+        "opis/closure": "^4",
         "google/cloud-common-protos": "~0.5"
     },
     "suggest": {
diff --git a/Logging/composer.json b/Logging/composer.json
index 37e368a128d2..5140f3f02872 100644
--- a/Logging/composer.json
+++ b/Logging/composer.json
@@ -19,7 +19,7 @@
         "google/cloud-storage": "^1.3",
         "google/cloud-bigquery": "^1.0",
         "google/cloud-pubsub": "^2.0",
-        "opis/closure": "^3",
+        "opis/closure": "^4",
         "monolog/monolog": "^3.8"
     },
     "provide": {
diff --git a/composer.json b/composer.json
index 3c7f792d23a5..c86ee9f8222f 100644
--- a/composer.json
+++ b/composer.json
@@ -59,7 +59,7 @@
         "erusev/parsedown": "^1.6",
         "phpseclib/phpseclib": "^3.0",
         "google/cloud-tools": "^0.15.0",
-        "opis/closure": "^3.0",
+        "opis/closure": "^4.0",
         "flix-tech/avro-php": "^5.0.0",
         "phpspec/prophecy-phpunit": "^2.1",
         "kreait/firebase-php": "^6.9",