diff --git a/Gemfile.lock b/Gemfile.lock
index 382da93..e6e6954 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -283,7 +283,7 @@ GEM
       concurrent-ruby (~> 1.0, >= 1.0.2)
     simpleidn (0.2.1)
       unf (~> 0.1.4)
-    spring (4.1.3)
+    spring (4.2.1)
     spring-commands-rspec (1.0.4)
       spring (>= 0.9.1)
     sprockets (3.7.2)