diff --git a/ghtml2pdf.gemspec b/ghtml2pdf.gemspec
index 2e8c6e1..c8b85d8 100644
--- a/ghtml2pdf.gemspec
+++ b/ghtml2pdf.gemspec
@@ -26,7 +26,7 @@ Gem::Specification.new do |spec|
   spec.executables = ["ghtml2pdf"]
   spec.require_paths = ["lib"]
 
-  spec.add_dependency "gir_ffi", "~> 0.18.0"
-  spec.add_dependency "gir_ffi-gtk", "~> 0.18.0"
+  spec.add_dependency "gir_ffi", "~> 0.19.0"
+  spec.add_dependency "gir_ffi-gtk", "~> 0.19.0"
   spec.add_dependency "ruby-units", "~> 4.0"
 end