Merge pull request #11412 from protocolbuffers/deannagarcia-patch-15

Pin ruby bundler

kokoro/release/ruby/macos/ruby/ruby_build_environment.sh

@@ -21,7 +21,7 @@ set -e  # rvm commands are very verbose
 time rvm install 2.5.0
 rvm use 2.5.0
 gem install rake-compiler --no-document
-gem install bundler --no-document
+gem install bundler -v 2.3.26 --no-document
 time rvm install 3.1.0
 rvm use 3.1.0
 gem install rake-compiler --no-document

ruby/travis-test.sh

@@ -13,7 +13,8 @@ test_version() {
       "rvm install $version && rvm use $version && rvm get head && \
        which ruby && \
        git clean -f && \
-       gem install --no-document bundler && bundle && \
+       gem install --no-document bundler -v 2.3.26 && \ # Pin to bundler with ruby 2.5
+       bundle && \
        rake test && \
        rake gc_test && \
        cd ../conformance && make test_jruby && \