diff --git a/Gemfile.lock b/Gemfile.lock
index 9b864ee..e6b51cf 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -134,7 +134,7 @@ GEM
     pry-stack_explorer (0.4.9.3)
       binding_of_caller (>= 0.7)
       pry (>= 0.9.11)
-    puma (4.2.1)
+    puma (4.3.5)
       nio4r (~> 2.0)
     rack (2.0.7)
     rack-test (1.1.0)