relaton_ietf.gemspec in relaton-ietf-1.9.2 vs relaton_ietf.gemspec in relaton-ietf-1.9.3

@@ -36,7 +36,8 @@
   spec.add_development_dependency "ruby-jing"
   spec.add_development_dependency "simplecov"
   spec.add_development_dependency "vcr"
   spec.add_development_dependency "webmock"
 
-  spec.add_dependency "relaton-bib", ">= 1.9.5"
+  spec.add_dependency "relaton-bib", ">= 1.9.8"
+  spec.add_dependency "zlib", "~> 1.1.0"
 end