diff --git a/Gemfile.lock b/Gemfile.lock
index 29e0286..f58b552 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -15,7 +15,7 @@ GEM
       simplecov_json_formatter (~> 0.1)
     simplecov-html (0.12.3)
     simplecov_json_formatter (0.1.4)
-    syntax_tree (6.2.0)
+    syntax_tree (6.3.0)
       prettier_print (>= 1.2.0)
     test-unit (3.7.0)
       power_assert