.travis.yml in redis-4.0.1 vs .travis.yml in redis-4.0.2

@@ -1,15 +1,21 @@
 language: ruby
+cache:
+    directories:
+      - tmp/cache
+before_install:
+  - gem update --system 2.6.14
+  - gem --version
 
 script: make test
 
 rvm:
   - 2.2.2
   - 2.3.3
   - 2.4.1
-  - jruby-9
-  - rbx-3
+  - 2.5.0
+  - jruby-9.1.17.0
 
 gemfile: ".travis/Gemfile"
 
 sudo: false
 
@@ -25,48 +31,30 @@
     - DRIVER=ruby      REDIS_BRANCH=3.2
     - DRIVER=hiredis   REDIS_BRANCH=3.0
     - DRIVER=hiredis   REDIS_BRANCH=3.2
     - DRIVER=synchrony REDIS_BRANCH=3.0
     - DRIVER=synchrony REDIS_BRANCH=3.2
-    - DRIVER=ruby      REDIS_BRANCH=unstable
+    - DRIVER=ruby      REDIS_BRANCH=4.0
 
 branches:
   only:
     - staging
     - trying
     - master
 
 matrix:
   exclude:
     # hiredis
-    - rvm: jruby-9
-      gemfile: .travis/Gemfile
-      env: DRIVER=hiredis REDIS_BRANCH=3.0
-    - rvm: jruby-9
-      gemfile: .travis/Gemfile
-      env: DRIVER=hiredis REDIS_BRANCH=3.2
-    - rvm: jruby-9
-      gemfile: .travis/Gemfile
-      env: DRIVER=hiredis REDIS_BRANCH=3.0
-    - rvm: jruby-9
-      gemfile: .travis/Gemfile
-      env: DRIVER=hiredis REDIS_BRANCH=3.2
+    - rvm: jruby-9.1.17.0
+      env: DRIVER=hiredis   REDIS_BRANCH=3.0
+    - rvm: jruby-9.1.17.0
+      env: DRIVER=hiredis   REDIS_BRANCH=3.2
 
     # synchrony
-    - rvm: jruby-9
-      gemfile: .travis/Gemfile
+    - rvm: jruby-9.1.17.0
       env: DRIVER=synchrony REDIS_BRANCH=3.0
-    - rvm: jruby-9
-      gemfile: .travis/Gemfile
+    - rvm: jruby-9.1.17.0
       env: DRIVER=synchrony REDIS_BRANCH=3.2
-    - rvm: jruby-9
-      gemfile: .travis/Gemfile
-      env: DRIVER=synchrony REDIS_BRANCH=3.0
-    - rvm: jruby-9
-      gemfile: .travis/Gemfile
-      env: DRIVER=synchrony REDIS_BRANCH=3.2
-  allow_failures:
-    - rvm: rbx-3
 
 notifications:
   irc:
     - irc.freenode.net#redis-rb
   email: false