diff --git a/Gemfile.lock b/Gemfile.lock
index 15b6e44..1fe92c1 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -26,9 +26,9 @@ GEM
     minitest (5.11.3)
     multi_json (1.13.1)
     mustermann (1.0.3)
-    nio4r (2.5.1)
+    nio4r (2.5.2)
     pg (1.1.4)
-    puma (4.1.0)
+    puma (4.3.5)
       nio4r (~> 2.0)
     rack (2.0.7)
     rack-protection (2.0.7)