diff --git a/build/ruby/Gemfile.lock b/build/ruby/Gemfile.lock
index 1c1b085..539d186 100644
--- a/build/ruby/Gemfile.lock
+++ b/build/ruby/Gemfile.lock
@@ -2,7 +2,7 @@ PATH
   remote: .
   specs:
     tucana (0.0.0)
-      grpc (~> 1.65)
+      grpc (~> 1.64)
 
 GEM
   remote: https://rubygems.org/
diff --git a/build/ruby/tucana.gemspec b/build/ruby/tucana.gemspec
index 37c769d..11cb56e 100644
--- a/build/ruby/tucana.gemspec
+++ b/build/ruby/tucana.gemspec
@@ -27,7 +27,7 @@ Gem::Specification.new do |spec|
   # For more information and examples about making a new gem, check out our
   # guide at: https://bundler.io/guides/creating_gem.html
 
-  spec.add_dependency "grpc", "~> 1.65"
+  spec.add_dependency "grpc", "~> 1.64"
 
   spec.add_development_dependency "grpc-tools", "~> 1.65"
   spec.add_development_dependency "rake", "~> 13.0"