diff --git a/src/SessionTracker.php b/src/SessionTracker.php
index <HASH>..<HASH> 100644
--- a/src/SessionTracker.php
+++ b/src/SessionTracker.php
@@ -2,6 +2,9 @@
 
 namespace Bugsnag;
 
+use Exception;
+use InvalidArgumentException;
+
 class SessionTracker
 {
     /**
Add missing imports in SessionTracker