diff --git a/Gemfile.lock b/Gemfile.lock
index 1c49cf76..7fd34548 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -312,7 +312,7 @@ GEM
       thor (~> 1.0)
       tilt (~> 2.0)
       yard (~> 0.9, >= 0.9.24)
-    spring (4.1.3)
+    spring (4.2.1)
     sprockets (4.2.0)
       concurrent-ruby (~> 1.0)
       rack (>= 2.2.4, < 4)