Fixing Ruby binary build (again).
diff --git a/templates/grpc.gemspec.template b/templates/grpc.gemspec.template
index 2040861..6cc3e96 100644
--- a/templates/grpc.gemspec.template
+++ b/templates/grpc.gemspec.template
@@ -33,7 +33,7 @@
     s.require_paths = %w( src/ruby/bin src/ruby/lib src/ruby/pb )
     s.platform      = Gem::Platform::RUBY
 
-    s.add_dependency 'google-protobuf', '~> 3.0.0.alpha.5.0'
+    s.add_dependency 'google-protobuf', '~> 3.0.0.alpha.5.0.2'
     s.add_dependency 'googleauth',      '~> 0.5.1'
 
     s.add_development_dependency 'bundler',            '~> 1.9'
@@ -41,7 +41,7 @@
     s.add_development_dependency 'simplecov',          '~> 0.9'
     s.add_development_dependency 'rake',               '~> 10.4'
     s.add_development_dependency 'rake-compiler',      '~> 0.9'
-    s.add_development_dependency 'rake-compiler-dock', '~> 0.5'
+    s.add_development_dependency 'rake-compiler-dock', '~> 0.5.1'
     s.add_development_dependency 'rspec',              '~> 3.2'
     s.add_development_dependency 'rubocop',            '~> 0.30.0'
     s.add_development_dependency 'signet',             '~> 0.7.0'