diff --git a/openproject-pdf_export.gemspec b/openproject-pdf_export.gemspec
index 622262bc62..70dcc737b0 100644
--- a/openproject-pdf_export.gemspec
+++ b/openproject-pdf_export.gemspec
@@ -19,5 +19,5 @@ Gem::Specification.new do |s|
 
   s.add_dependency "prawn", "~> 2.2"
 
-  s.add_development_dependency "pdf-inspector", "~>1.0.0"
+  s.add_development_dependency "pdf-inspector", "~>1.3.0"
 end