diff --git a/Gemfile.lock b/Gemfile.lock
index 768852c..b02804c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,7 +8,7 @@ GEM
     rake (13.3.0)
     rexml (3.3.9)
     rouge (4.5.2)
-    syntax_tree (6.2.0)
+    syntax_tree (6.3.0)
       prettier_print (>= 1.2.0)
     test-unit (3.7.0)
       power_assert