diff --git a/prawn.gemspec b/prawn.gemspec
index 230be4f2f..4ca5da3c9 100644
--- a/prawn.gemspec
+++ b/prawn.gemspec
@@ -25,7 +25,7 @@ Gem::Specification.new do |spec|
   spec.licenses = %w(PRAWN GPL-2.0 GPL-3.0)
 
   spec.add_dependency('ttfunk', '~> 1.4.0')
-  spec.add_dependency('pdf-core', "~> 0.6.0")
+  spec.add_dependency('pdf-core', "~> 0.6.1")
 
   spec.add_development_dependency('pdf-inspector', '~> 1.2.1')
   spec.add_development_dependency('yard')