diff --git a/trmnl-api.gemspec b/trmnl-api.gemspec
index 69383a9..1e4420c 100644
--- a/trmnl-api.gemspec
+++ b/trmnl-api.gemspec
@@ -30,6 +30,7 @@ Gem::Specification.new do |spec|
   spec.add_dependency "http", "~> 5.3"
   spec.add_dependency "infusible", "~> 4.3"
   spec.add_dependency "inspectable", "~> 0.3"
+  spec.add_dependency "openssl", "~> 3.3"
   spec.add_dependency "pipeable", "~> 1.3"
   spec.add_dependency "zeitwerk", "~> 2.7"