asciidoctor-iso.gemspec in asciidoctor-iso-0.10.2 vs asciidoctor-iso.gemspec in asciidoctor-iso-0.10.3

@@ -27,10 +27,10 @@
   spec.test_files    = `git ls-files -- {spec}/*`.split("\n")
   spec.required_ruby_version = Gem::Requirement.new(">= 2.3.0")
 
   spec.add_dependency "asciidoctor", "~> 1.5.7"
   spec.add_dependency "ruby-jing"
-  spec.add_dependency "isodoc", ">= 0.8"
+  spec.add_dependency "isodoc", "~> 0.8.8"
   spec.add_dependency "iev", "~> 0.2.0"
   spec.add_dependency "relaton", "~> 0.1.3"
   spec.add_dependency "metanorma-standoc", "~> 0.0.1"
 
   spec.add_development_dependency "bundler", "~> 1.15"