diff --git a/Gemfile.lock b/Gemfile.lock
index 618b1379260..b7c4c240407 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -308,7 +308,7 @@ GEM
     os (1.0.1)
     palm_civet (1.1.0)
     parallel (1.20.1)
-    parallel_tests (3.4.0)
+    parallel_tests (3.5.1)
       parallel
     parser (2.7.2.0)
       ast (~> 2.4.1)