diff --git a/Gemfile.lock b/Gemfile.lock
index f62f359..772d3f5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -142,11 +142,13 @@ GEM
     pg (1.1.4-x64-mingw32)
     pg (1.1.4-x86-mingw32)
     public_suffix (3.0.3)
-    puma (3.12.2)
-    puma (3.12.2-java)
+    puma (4.3.12)
+      nio4r (~> 2.0)
+    puma (4.3.12-java)
+      nio4r (~> 2.0)
     racc (1.5.2)
     racc (1.5.2-java)
-    rack (2.2.3)
+    rack (2.2.3.1)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rails (5.2.2)