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-rw-r--r--sample/trick2018/03-tompng/Gemfile2
1 files changed, 1 insertions, 1 deletions
diff --git a/sample/trick2018/03-tompng/Gemfile b/sample/trick2018/03-tompng/Gemfile
index 983f2f3bd4..a24ff779dc 100644
--- a/sample/trick2018/03-tompng/Gemfile
+++ b/sample/trick2018/03-tompng/Gemfile
@@ -1,2 +1,2 @@
-ruby '2.5.0'
+source 'https://rubygems.org'
gem 'chunky_png'