diff --git a/grpc.gemspec b/grpc.gemspec
index f1561d61ec2f2971ebca14de9b4f6c0872e9d0e4..bf4435a9d71f18377e8b750f5a39f1f19b3ff448 100755
--- a/grpc.gemspec
+++ b/grpc.gemspec
@@ -42,7 +42,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'rake-compiler', '~> 0.9'
   s.add_development_dependency 'rspec', '~> 3.2'
   s.add_development_dependency 'rubocop', '~> 0.30.0'
-  s.add_development_dependency 'signet', '~>0.6.0'
+  s.add_development_dependency 'signet', '~>0.7.0'
 
   s.extensions = %w(src/ruby/ext/grpc/extconf.rb)
 
diff --git a/src/ruby/pb/test/client.rb b/src/ruby/pb/test/client.rb
index 94bfff126085f19b85d0ed16a3e2eabd4b4636ad..8dbfed4b2967b9d6df2725a32c57c0e93691e7b7 100755
--- a/src/ruby/pb/test/client.rb
+++ b/src/ruby/pb/test/client.rb
@@ -56,8 +56,6 @@ require 'test/proto/empty'
 require 'test/proto/messages'
 require 'test/proto/test_services'
 
-require 'signet/ssl_config'
-
 AUTH_ENV = Google::Auth::CredentialsLoader::ENV_VAR
 
 # RubyLogger defines a logger for gRPC based on the standard ruby logger.
@@ -268,11 +266,6 @@ class NamedTests
     auth_creds = Google::Auth.get_application_default(@args.oauth_scope)
     kw = auth_creds.updater_proc.call({})
 
-    # TODO(jtattermusch): downcase the metadata keys here to make sure
-    # they are not rejected by C core. This is a hotfix that should
-    # be addressed by introducing auto-downcasing logic.
-    kw = Hash[ kw.each_pair.map { |k, v|  [k.downcase, v] }]
-
     resp = perform_large_unary(fill_username: true,
                                fill_oauth_scope: true,
                                **kw)
diff --git a/src/ruby/spec/pb/health/checker_spec.rb b/src/ruby/spec/pb/health/checker_spec.rb
index 794c5922fa061fb43605d5909840691c80aa7308..10d3a0705ac18438f954f405fd1aff02d93efb7a 100644
--- a/src/ruby/spec/pb/health/checker_spec.rb
+++ b/src/ruby/spec/pb/health/checker_spec.rb
@@ -47,13 +47,12 @@ describe 'Health protobuf code generation' do
       end
 
       it 'should have the same content as created by code generation' do
-        root_dir = File.dirname(
-          File.dirname(File.dirname(File.dirname(__FILE__))))
-        pb_dir = File.join(root_dir, 'pb')
+        root_dir = File.join(File.dirname(__FILE__), '..', '..', '..', '..')
+        pb_dir = File.join(root_dir, 'proto')
 
         # Get the current content
-        service_path = File.join(pb_dir, 'grpc', 'health', 'v1alpha',
-                                 'health_services.rb')
+        service_path = File.join(root_dir, 'ruby', 'pb', 'grpc',
+                                 'health', 'v1alpha', 'health_services.rb')
         want = nil
         File.open(service_path) { |f| want = f.read }
 
diff --git a/templates/grpc.gemspec.template b/templates/grpc.gemspec.template
index 8839b9be5544d43f3b1de407121ea0ce432ed622..fdf87ee13fd14090fd1c1b56b4f251285e36465a 100644
--- a/templates/grpc.gemspec.template
+++ b/templates/grpc.gemspec.template
@@ -44,7 +44,7 @@
     s.add_development_dependency 'rake-compiler', '~> 0.9'
     s.add_development_dependency 'rspec', '~> 3.2'
     s.add_development_dependency 'rubocop', '~> 0.30.0'
-    s.add_development_dependency 'signet', '~>0.6.0'
+    s.add_development_dependency 'signet', '~>0.7.0'
 
     s.extensions = %w(src/ruby/ext/grpc/extconf.rb)