diff --git a/instana.gemspec b/instana.gemspec
index cefa4263..73774fe9 100644
--- a/instana.gemspec
+++ b/instana.gemspec
@@ -40,7 +40,9 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "appraisal"
   spec.add_development_dependency "fakefs"
 
+  spec.add_runtime_dependency('base64', '>= 0.1')
   spec.add_runtime_dependency('concurrent-ruby', '>= 1.1')
+  spec.add_runtime_dependency('csv', '>= 0.1')
   spec.add_runtime_dependency('sys-proctable', '>= 1.2.2')
   spec.add_runtime_dependency('oj', '>=3.0.11') unless RUBY_PLATFORM =~ /java/i
 end