diff --git a/.travis.yml b/.travis.yml
index 1eaad615f..3a33c6c15 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -40,6 +40,8 @@ matrix:
       env: JRUBY_OPTS='--dev --1.8'
     - rvm: 2.7.1
       env: DIFF_LCS_VERSION="~> 1.3.0"
+    - rvm: 2.7.1
+      env: DIFF_LCS_VERSION="1.4.3"
   allow_failures:
     - rvm: jruby-head
     - rvm: ruby-head
diff --git a/spec/rspec/support/differ_spec.rb b/spec/rspec/support/differ_spec.rb
index 4fc1ca2a4..f27c169e9 100644
--- a/spec/rspec/support/differ_spec.rb
+++ b/spec/rspec/support/differ_spec.rb
@@ -40,7 +40,7 @@ module Support
             expected_diff = dedent(<<-'EOD')
               |
               |
-              |@@ -1,6 +1,6 @@
+              |@@ -1,4 +1,6 @@
               | foo
               |-zap
               | bar