diff --git a/async-http.gemspec b/async-http.gemspec
index 6eac6da9..5247d9c5 100644
--- a/async-http.gemspec
+++ b/async-http.gemspec
@@ -22,9 +22,8 @@ Gem::Specification.new do |spec|
 	spec.add_dependency "async", ">= 1.25"
 	spec.add_dependency "async-io", ">= 1.28"
 	spec.add_dependency "async-pool", ">= 0.2"
-	spec.add_dependency "base64"
-	spec.add_dependency "protocol-http", "~> 0.25.0"
-	spec.add_dependency "protocol-http1", "~> 0.17.0"
-	spec.add_dependency "protocol-http2", "~> 0.15.0"
+	spec.add_dependency "protocol-http", "~> 0.26.0"
+	spec.add_dependency "protocol-http1", "~> 0.18.0"
+	spec.add_dependency "protocol-http2", "~> 0.16.0"
 	spec.add_dependency "traces", ">= 0.10.0"
 end