diff --git a/gemfiles/3.1/Gemfile.lock b/gemfiles/3.1/Gemfile.lock
index 002e6cc70b..e84f930ae6 100644
--- a/gemfiles/3.1/Gemfile.lock
+++ b/gemfiles/3.1/Gemfile.lock
@@ -14,7 +14,7 @@ GEM
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
     onigmo (0.1.0)
-    parser (3.3.4.2)
+    parser (3.3.5.0)
       ast (~> 2.4.1)
       racc
     power_assert (2.0.3)