diff --git a/cct.gemspec b/cct.gemspec
index 292000f..2c3627c 100644
--- a/cct.gemspec
+++ b/cct.gemspec
@@ -21,10 +21,10 @@ Gem::Specification.new do |spec|
   spec.add_dependency "rake", "~> 10.0"
   spec.add_dependency "bundler", "~> 1.6"
   spec.add_dependency "rspec", "~> 3.2.0"
-  spec.add_dependency "net-ssh"
-  spec.add_dependency "net-ssh-gateway"
-  spec.add_dependency "awesome_print"
-  spec.add_dependency "faraday"
-  spec.add_dependency "faraday-digestauth"
-  spec.add_dependency "faraday_middleware"
+  spec.add_dependency "net-ssh", "~> 2.9.2"
+  spec.add_dependency "net-ssh-gateway", "~> 1.2.0"
+  spec.add_dependency "awesome_print", "~> 1.6.1"
+  spec.add_dependency "faraday", "~> 0.9.1"
+  spec.add_dependency "faraday-digestauth", "~> 0.2.1"
+  spec.add_dependency "faraday_middleware", "~> 0.9.2"
 end