.travis.yml in curation_concerns-1.4.0 vs .travis.yml in curation_concerns-1.5.0

@@ -6,10 +6,12 @@
 env:
   global:
   - NOKOGIRI_USE_SYSTEM_LIBRARIES=true
   matrix:
     - RAILS_VERSION=4.2.7
+      RDF_VERSION=1.99.1
     - RAILS_VERSION=5.0.0
+      RDF_VERSION=2.1.0
 notifications:
   irc:
     channels:
       - "irc.freenode.org#projecthydra"
     template: