diff --git a/Gemfile.lock b/Gemfile.lock
index 9df2535..240fec2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -20,7 +20,7 @@ GEM
       simplecov_json_formatter (~> 0.1)
     simplecov-html (0.12.3)
     simplecov_json_formatter (0.1.4)
-    syntax_tree (2.1.1)
+    syntax_tree (2.2.0)
     temple (0.8.2)
     tilt (2.0.10)