diff --git a/gems.locked b/gems.locked
index 149315e..9f1babe 100644
--- a/gems.locked
+++ b/gems.locked
@@ -33,10 +33,12 @@ GEM
       ruby-progressbar
     multi_xml (0.6.0)
     mustermann (1.0.3)
+    nio4r (2.5.7)
     parallel (1.17.0)
     parser (2.6.3.0)
       ast (~> 2.4.0)
-    puma (3.12.4)
+    puma (4.3.8)
+      nio4r (~> 2.0)
     rack (2.0.8)
     rack-protection (2.0.5)
       rack