diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 10e0394..c81f1c3 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -19,6 +19,7 @@ jobs:
           args: --coverage-text
           php_extensions: xdebug
           php_version: 7.3
+          memory_limit: "192M"
           version: 9
         env:
           XDEBUG_MODE: coverage
@@ -40,6 +41,7 @@ jobs:
           args: --coverage-text
           php_extensions: xdebug
           php_version: 8.1
+          memory_limit: "192M"
           version: 9
         env:
           XDEBUG_MODE: coverage
\ No newline at end of file
diff --git a/README.md b/README.md
index 4bbb3e0..76553ce 100644
--- a/README.md
+++ b/README.md
@@ -13,7 +13,7 @@ An SDK for Authorize.net, using Guzzle.
 
 ## Dependencies
 
-PHP version >= 7.2 is required.
+PHP version >= 7.3 is required.
 
 The following PHP extensions are required:
 * json
diff --git a/composer.json b/composer.json
index fc3713f..355c26d 100644
--- a/composer.json
+++ b/composer.json
@@ -4,7 +4,7 @@
     "type": "library",
     "keywords": ["authorizenet", "authorize.net", "payment", "ecommerce"],
     "require": {
-        "php": ">=7.2",
+        "php": ">=7.3",
         "ext-json": "*",
         "ext-simplexml": "*",
         "ext-xmlwriter": "*",
diff --git a/tests/ARBCreateSubscriptionRequestTest.php b/tests/ARBCreateSubscriptionRequestTest.php
index ad0dc56..5ced203 100644
--- a/tests/ARBCreateSubscriptionRequestTest.php
+++ b/tests/ARBCreateSubscriptionRequestTest.php
@@ -90,8 +90,8 @@ protected function cleanupSubscriptions()
                 $response = $cancel->execute();
                 $this->assertEquals('Ok', $response->getResultCode());
                 $canceled_count++;
-                // Stop after canceling 100 subscriptions.
-                if ($canceled_count > 100) {
+                // Stop after canceling 50 subscriptions.
+                if ($canceled_count > 50) {
                     break 2;
                 }
             }