diff --git a/savon.gemspec b/savon.gemspec
index ad7c9f24..8c71f1c3 100644
--- a/savon.gemspec
+++ b/savon.gemspec
@@ -17,8 +17,8 @@ Gem::Specification.new do |s|
   s.license = 'MIT'
 
   s.add_dependency "nori",     "~> 2.4"
-  s.add_dependency "httpi",    ">= 2.4.5"
-  s.add_dependency "wasabi",   ">= 3.7", " < 5"
+  s.add_dependency "httpi",    ">= 2.4.5", " < 5"
+  s.add_dependency "wasabi",   ">= 3.7", " < 6"
   s.add_dependency "akami",    "~> 1.2"
   s.add_dependency "gyoku",    "~> 1.2"
   s.add_dependency "builder",  ">= 2.1.2"