diff --git a/steep/Gemfile.lock b/steep/Gemfile.lock
index 30e39b24d..ed002002a 100644
--- a/steep/Gemfile.lock
+++ b/steep/Gemfile.lock
@@ -30,7 +30,7 @@ GEM
     logger (1.6.0)
     minitest (5.23.1)
     mutex_m (0.2.0)
-    parser (3.3.2.0)
+    parser (3.3.3.0)
       ast (~> 2.4.1)
       racc
     racc (1.8.0)