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-rw-r--r--ext/zlib/zlib.gemspec2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/zlib/zlib.gemspec b/ext/zlib/zlib.gemspec
index 4b81ea11ea..ca2de4e295 100644
--- a/ext/zlib/zlib.gemspec
+++ b/ext/zlib/zlib.gemspec
@@ -8,7 +8,7 @@ Gem::Specification.new do |s|
s.require_path = %w{lib}
s.files = %w{depend extconf.rb zlib.c}
s.extensions = %w{extconf.rb}
- s.required_ruby_version = ">= 2.5.0"
+ s.required_ruby_version = ">= 2.5.0dev"
s.authors = ["UENO Katsuhiro"]
s.email = [nil]