diff --git a/youplot.gemspec b/youplot.gemspec
index c4c1169..a82c059 100644
--- a/youplot.gemspec
+++ b/youplot.gemspec
@@ -19,7 +19,7 @@ Gem::Specification.new do |spec|
   spec.executables   = %w[uplot youplot]
   spec.require_paths = ['lib']
 
-  spec.add_runtime_dependency 'unicode_plot'
+  spec.add_runtime_dependency 'unicode_plot', '>= 0.0.5'
   spec.add_development_dependency 'bundler'
   spec.add_development_dependency 'rake'
   spec.add_development_dependency 'rubocop'