diff --git a/Gemfile.lock b/Gemfile.lock
index eea12f5..5d693c2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    grpc-tools (1.25.0)
+    grpc-tools (1.37.1)
 
 PLATFORMS
   ruby
diff --git a/testdata/broken_field_name_pb.rb b/testdata/broken_field_name_pb.rb
index 43dfcfc..10dbc47 100644
--- a/testdata/broken_field_name_pb.rb
+++ b/testdata/broken_field_name_pb.rb
@@ -13,5 +13,5 @@
 end
 
 module Example
-  Broken_field_name = Google::Protobuf::DescriptorPool.generated_pool.lookup("example.broken_field_name").msgclass
+  Broken_field_name = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("example.broken_field_name").msgclass
 end
diff --git a/testdata/example_pb.rb b/testdata/example_pb.rb
index a47122f..19e3096 100644
--- a/testdata/example_pb.rb
+++ b/testdata/example_pb.rb
@@ -15,6 +15,6 @@
 end
 
 module Example
-  Request = Google::Protobuf::DescriptorPool.generated_pool.lookup("example.Request").msgclass
-  Response = Google::Protobuf::DescriptorPool.generated_pool.lookup("example.Response").msgclass
+  Request = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("example.Request").msgclass
+  Response = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("example.Response").msgclass
 end
diff --git a/testdata/example_services_pb.rb b/testdata/example_services_pb.rb
index 18d81ef..d477f0e 100644
--- a/testdata/example_services_pb.rb
+++ b/testdata/example_services_pb.rb
@@ -8,13 +8,13 @@ module Example
   module Greeter
     class Service
 
-      include GRPC::GenericService
+      include ::GRPC::GenericService
 
       self.marshal_class_method = :encode
       self.unmarshal_class_method = :decode
       self.service_name = 'example.Greeter'
 
-      rpc :Hello, Request, Response
+      rpc :Hello, ::Example::Request, ::Example::Response
     end
 
     Stub = Service.rpc_stub_class
diff --git a/testdata/lowercase_pb.rb b/testdata/lowercase_pb.rb
index 7ecd071..0eea426 100644
--- a/testdata/lowercase_pb.rb
+++ b/testdata/lowercase_pb.rb
@@ -15,6 +15,6 @@
 end
 
 module Example
-  Lowercase = Google::Protobuf::DescriptorPool.generated_pool.lookup("example.lowercase").msgclass
-  Lowercase_with_underscores = Google::Protobuf::DescriptorPool.generated_pool.lookup("example.lowercase_with_underscores").msgclass
+  Lowercase = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("example.lowercase").msgclass
+  Lowercase_with_underscores = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("example.lowercase_with_underscores").msgclass
 end
diff --git a/testdata/services_services_pb.rb b/testdata/services_services_pb.rb
index 312fc1a..c5bebdf 100644
--- a/testdata/services_services_pb.rb
+++ b/testdata/services_services_pb.rb
@@ -9,16 +9,16 @@ module SimpleMathematics
     # The mathematics service definition.
     class Service
 
-      include GRPC::GenericService
+      include ::GRPC::GenericService
 
       self.marshal_class_method = :encode
       self.unmarshal_class_method = :decode
       self.service_name = 'testdata.SimpleMathematics'
 
       # Negates the input
-      rpc :Negate, Subdir::IntegerMessage, Subdir::IntegerMessage
+      rpc :Negate, ::Testdata::Subdir::IntegerMessage, ::Testdata::Subdir::IntegerMessage
       # Report the median of a stream of integers
-      rpc :Median, stream(Subdir::IntegerMessage), Subdir::IntegerMessage
+      rpc :Median, stream(::Testdata::Subdir::IntegerMessage), ::Testdata::Subdir::IntegerMessage
     end
 
     Stub = Service.rpc_stub_class
@@ -26,18 +26,18 @@ class Service
   module ComplexMathematics
     class Service
 
-      include GRPC::GenericService
+      include ::GRPC::GenericService
 
       self.marshal_class_method = :encode
       self.unmarshal_class_method = :decode
       self.service_name = 'testdata.ComplexMathematics'
 
       # Stream the first N numbers in the Fibonacci sequence
-      rpc :Fibonacci, Subdir::IntegerMessage, stream(Subdir::IntegerMessage)
+      rpc :Fibonacci, ::Testdata::Subdir::IntegerMessage, stream(::Testdata::Subdir::IntegerMessage)
       # Accept a stream of integers, and report whenever a new maximum is found
-      rpc :RunningMax, stream(Subdir::IntegerMessage), stream(Subdir::IntegerMessage)
+      rpc :RunningMax, stream(::Testdata::Subdir::IntegerMessage), stream(::Testdata::Subdir::IntegerMessage)
       # Accept a stream of integers, and report the maximum every second
-      rpc :PeriodicMax, stream(Subdir::IntegerMessage), stream(Subdir::IntegerMessage)
+      rpc :PeriodicMax, stream(::Testdata::Subdir::IntegerMessage), stream(::Testdata::Subdir::IntegerMessage)
     end
 
     Stub = Service.rpc_stub_class
diff --git a/testdata/subdir/messages_pb.rb b/testdata/subdir/messages_pb.rb
index 1ee1ee2..5716f1a 100644
--- a/testdata/subdir/messages_pb.rb
+++ b/testdata/subdir/messages_pb.rb
@@ -69,13 +69,13 @@
 
 module Testdata
   module Subdir
-    IntegerMessage = Google::Protobuf::DescriptorPool.generated_pool.lookup("testdata.subdir.IntegerMessage").msgclass
-    IntegerMessage::InnerNestedMessage = Google::Protobuf::DescriptorPool.generated_pool.lookup("testdata.subdir.IntegerMessage.InnerNestedMessage").msgclass
-    IntegerMessage::NestedEmpty = Google::Protobuf::DescriptorPool.generated_pool.lookup("testdata.subdir.IntegerMessage.NestedEmpty").msgclass
-    Empty = Google::Protobuf::DescriptorPool.generated_pool.lookup("testdata.subdir.Empty").msgclass
-    AllTypes = Google::Protobuf::DescriptorPool.generated_pool.lookup("testdata.subdir.AllTypes").msgclass
-    AllTypes::InnerMessage = Google::Protobuf::DescriptorPool.generated_pool.lookup("testdata.subdir.AllTypes.InnerMessage").msgclass
-    AllTypes::Corpus = Google::Protobuf::DescriptorPool.generated_pool.lookup("testdata.subdir.AllTypes.Corpus").enummodule
-    AllTypes::EnumAllowingAlias = Google::Protobuf::DescriptorPool.generated_pool.lookup("testdata.subdir.AllTypes.EnumAllowingAlias").enummodule
+    IntegerMessage = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("testdata.subdir.IntegerMessage").msgclass
+    IntegerMessage::InnerNestedMessage = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("testdata.subdir.IntegerMessage.InnerNestedMessage").msgclass
+    IntegerMessage::NestedEmpty = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("testdata.subdir.IntegerMessage.NestedEmpty").msgclass
+    Empty = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("testdata.subdir.Empty").msgclass
+    AllTypes = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("testdata.subdir.AllTypes").msgclass
+    AllTypes::InnerMessage = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("testdata.subdir.AllTypes.InnerMessage").msgclass
+    AllTypes::Corpus = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("testdata.subdir.AllTypes.Corpus").enummodule
+    AllTypes::EnumAllowingAlias = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("testdata.subdir.AllTypes.EnumAllowingAlias").enummodule
   end
 end