diff --git a/.travis.yml b/.travis.yml
index e02a805..2861f53 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,3 +1,5 @@
+dist: bionic
+
 notifications:
   email: false
 
diff --git a/Gemfile b/Gemfile
index 2ca2bab..a5960f9 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,4 +1,4 @@
-source 'http://rubygems.org'
+source 'https://rubygems.org'
 
 gemspec
 
diff --git a/spec/lib/blacklight_advanced_search/render_constraints_override_spec.rb b/spec/lib/blacklight_advanced_search/render_constraints_override_spec.rb
index 3f73aa4..fec28d4 100644
--- a/spec/lib/blacklight_advanced_search/render_constraints_override_spec.rb
+++ b/spec/lib/blacklight_advanced_search/render_constraints_override_spec.rb
@@ -18,7 +18,8 @@
       end
     end
 
-    subject(:rendered) { helper.render_constraints_filters({}) }
+    let (:search_state) { Blacklight::SearchState.new(params, blacklight_config)}
+    subject(:rendered) { helper.render_constraints_filters(search_state) }
 
     context 'with an array of facet params' do
       let(:params) { ActionController::Parameters.new f_inclusive: { 'type' => ['a'] } }