.travis.yml in cloudinary-1.24.0 vs .travis.yml in cloudinary-1.25.0

@@ -14,10 +14,10 @@
         - gem install bundler -v 1.17.3
     - name: "Ruby 2.5.9"
       dist: xenial
       rvm: ruby-2.5.9
       before_install:
-        - gem install bundler
+        - gem install bundler -v 2.3.26
 
 before_script: >
   export CLOUDINARY_URL=$(bash tools/get_test_cloud.sh);
   echo cloud_name: "$(echo $CLOUDINARY_URL | cut -d'@' -f2)"
 script: bundle exec rspec