diff --git a/composer.json b/composer.json
index ffb67d5..69c3788 100644
--- a/composer.json
+++ b/composer.json
@@ -5,7 +5,8 @@
     "require": {
         "php": ">=5.3",
         "ext-curl": "*",
-        "ext-json": "*"
+        "ext-json": "*",
+        "composer/ca-bundle": "^1.2"
     },
     "require-dev": {
         "phpunit/phpunit": "7.0.*",
diff --git a/src/MailChimp.php b/src/MailChimp.php
index 016c3a7..aae17a1 100644
--- a/src/MailChimp.php
+++ b/src/MailChimp.php
@@ -2,6 +2,8 @@
 
 namespace DrewM\MailChimp;
 
+use Composer\CaBundle\CaBundle;
+
 /**
  * Super-simple, minimum abstraction MailChimp API v3 wrapper
  * MailChimp API v3: http://developer.mailchimp.com
@@ -243,6 +245,13 @@ private function makeRequest($http_verb, $method, $args = array(), $timeout = se
         curl_setopt($ch, CURLOPT_ENCODING, '');
         curl_setopt($ch, CURLINFO_HEADER_OUT, true);
 
+	    $caPathOrFile = CaBundle::getSystemCaRootBundlePath();
+	    if (is_dir($caPathOrFile)) {
+		    curl_setopt($ch, CURLOPT_CAPATH, $caPathOrFile);
+	    } else {
+		    curl_setopt($ch, CURLOPT_CAINFO, $caPathOrFile);
+	    }
+
         switch ($http_verb) {
             case 'post':
                 curl_setopt($ch, CURLOPT_POST, true);