diff --git a/Gemfile b/Gemfile
index f8620a6..1f5e588 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,7 +6,7 @@ gem "ridley"
 gem "tinyconfig", "~> 0.1"
 gem "oj", platforms: :ruby         # to be used by multijson
 gem "jrjackson", platforms: :jruby # to be used by multijson
-gem "puma"
+gem "puma", ">= 5.6.8"
 gem "rubysl", "~> 2.0", platforms: :rbx
 gem "racc", platforms: :rbx
 gem "deep_merge"