diff --git a/Gemfile.lock b/Gemfile.lock
index d1f9471..201aa93 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -72,6 +72,8 @@ GEM
     minitest (5.11.3)
     minitest-parallel_fork (1.1.2)
     multipart-post (2.0.0)
+    nio4r (2.5.8)
+    nio4r (2.5.8-java)
     nokogiri (1.10.8)
       mini_portile2 (~> 2.4.0)
     nokogiri (1.10.8-java)
@@ -85,8 +87,10 @@ GEM
       method_source (~> 0.9.0)
       spoon (~> 0.0)
     public_suffix (3.0.3)
-    puma (3.12.4)
-    puma (3.12.4-java)
+    puma (4.3.12)
+      nio4r (~> 2.0)
+    puma (4.3.12-java)
+      nio4r (~> 2.0)
     raabro (1.1.6)
     rack (2.2.3)
     rack-protection (2.0.5)