diff --git a/.gitignore b/.gitignore
index 361d987..2f19695 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,9 @@
 # Composer vendor directory
 vendor
 
+# Composer composer.lock file
+composer.lock
+
 # PHPUnit local config file
 tests/config/config.php