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Rubyを上げただけでテストに落りるようになったつらい昼飯にしよ

$ git diff
diff --git a/.ruby-version b/.ruby-version
index aedc15b..ec1cf33 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-2.5.3
+2.6.3
diff --git a/Gemfile b/Gemfile
index d8ce69b..c588d21 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,5 +1,5 @@
source 'https://rubygems.org'
-ruby '>= 2.3.0', '< 2.6.0'
+ruby '>= 2.3.0', '< 2.7.0'

gem 'puma'

$ bundle exec rake test
：
1) Error:
：
ThreadError: already initialized
：