diff --git a/.travis.yml b/.travis.yml
index 36201fb..5a5032e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,10 @@
 language: ruby
+env:
+  - JAVA_OPTS=-Djava.security.egd=file:/dev/./urandom --server -Dcext.enabled=false -Xcompile.invokedynamic=false
 rvm:
   - 2.0.0
-  - 2.1.8
-  - 2.2.4
-  - jruby
+  - 2.1.10
+  - 2.2.7
+  - 2.3.4
+  - 2.4.1
+  - jruby-9.1.10.0
diff --git a/epics.gemspec b/epics.gemspec
index dc5c590..302e3c5 100644
--- a/epics.gemspec
+++ b/epics.gemspec
@@ -37,7 +37,12 @@ Gem::Specification.new do |spec|
   spec.post_install_message += "Please create an issue on github (railslove/epics) if anything does not work as expected. And contact team@railslove.com if you are looking for support with your integration.\n"
   spec.post_install_message += "\e[32m" + ("*" * 60) + "\n\e[0m"
 
-  spec.add_dependency "nokogiri"
+  if RUBY_VERSION < '2.1'
+    spec.add_dependency "nokogiri", '< 1.7.0'
+  else
+    spec.add_dependency "nokogiri"
+  end
+
   spec.add_dependency "gyoku"
   spec.add_dependency "faraday"
   spec.add_dependency "rubyzip", ">= 1.0.0"
diff --git a/lib/epics/client.rb b/lib/epics/client.rb
index 740a40b..b8abf8f 100644
--- a/lib/epics/client.rb
+++ b/lib/epics/client.rb
@@ -102,8 +102,12 @@ def HPB
       exponent = Base64.decode64(node.at_xpath(".//*[local-name() = 'Exponent']").content)
 
       bank   = OpenSSL::PKey::RSA.new
-      bank.n = OpenSSL::BN.new(modulus, 2)
-      bank.e = OpenSSL::BN.new(exponent, 2)
+      if bank.respond_to?(:set_key)
+        bank.set_key(OpenSSL::BN.new(modulus, 2), OpenSSL::BN.new(exponent, 2), nil)
+      else
+        bank.n = OpenSSL::BN.new(modulus, 2)
+        bank.e = OpenSSL::BN.new(exponent, 2)
+      end
 
       self.keys["#{host_id.upcase}.#{type}"] = Epics::Key.new(bank)
     end
@@ -225,7 +229,7 @@ def dump_keys
   end
 
   def cipher
-    @cipher ||= OpenSSL::Cipher::Cipher.new("aes-256-cbc")
+    @cipher ||= OpenSSL::Cipher.new("aes-256-cbc")
   end
 
   def encrypt(data)
diff --git a/lib/epics/generic_upload_request.rb b/lib/epics/generic_upload_request.rb
index 53636a1..74fdd88 100644
--- a/lib/epics/generic_upload_request.rb
+++ b/lib/epics/generic_upload_request.rb
@@ -10,7 +10,7 @@ def initialize(client, document)
   end
 
   def cipher
-    @cipher ||= OpenSSL::Cipher::Cipher.new("aes-128-cbc")
+    @cipher ||= OpenSSL::Cipher.new("aes-128-cbc")
   end
 
   def digester
diff --git a/lib/epics/response.rb b/lib/epics/response.rb
index c5a45d6..714127e 100644
--- a/lib/epics/response.rb
+++ b/lib/epics/response.rb
@@ -84,7 +84,7 @@ def order_data
   end
 
   def cipher
-    cipher = OpenSSL::Cipher::Cipher.new("aes-128-cbc")
+    cipher = OpenSSL::Cipher.new("aes-128-cbc")
 
     cipher.decrypt
     cipher.padding = 0
diff --git a/spec/generic_upload_spec.rb b/spec/generic_upload_spec.rb
index fef3bac..156623f 100644
--- a/spec/generic_upload_spec.rb
+++ b/spec/generic_upload_spec.rb
@@ -18,7 +18,8 @@
   end
 
   describe '#signature_value' do
-    before { allow(OpenSSL::Random).to receive(:random_bytes).and_return(Base64.strict_decode64("7wtROfiX4tyN60cygJUSsHkhzxX1RVJa8vGNYnflvKc=")) }
+    before { allow(OpenSSL::Random).to receive(:random_bytes).with(16).and_return("\x01" * 16) } # fake random_key requires a 16byte lenght but is not used in this test
+    before { allow(OpenSSL::Random).to receive(:random_bytes).with(32).and_return(Base64.strict_decode64("7wtROfiX4tyN60cygJUSsHkhzxX1RVJa8vGNYnflvKc=")) } # digest requires 32 bytes
 
     it 'will be the signed document' do
       expect(subject.signature_value).to eq("BQBMyxGHYoAbbmbMJRFbGrvUNinY15+qeeRLF708VL+tuENnbJMO6xHLWxU1rksOnu4xDzxfua9b3IxIaxLyTTFDuVi6bbu3sBslhIt2frdigo0xBL14KUJQ/pYiMj+2pfNYhtVxzamrnvgPSLNAEn36JykK2d347chT87HlZ7CAGNBS7lJHAzRP1v7Hkc+kKttkkWCpOGk06R6FUCxxVKXmQketMEl/scsMyJ3JtBe/EcjEZdDe5WcqZYUu5ARrfEiAeyutVRZnu17c3nKwkmWl7UqFAwp16cS8IPNL4i5FGCytgKl/kyaoxaE/P1lrGOkHcCTsSR0bAbARhndfdQ==")