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-rw-r--r--lib/test/unit/test-unit.gemspec4
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/test/unit/test-unit.gemspec b/lib/test/unit/test-unit.gemspec
index 6c7d22379d..363fd50c02 100644
--- a/lib/test/unit/test-unit.gemspec
+++ b/lib/test/unit/test-unit.gemspec
@@ -11,4 +11,8 @@ Gem::Specification.new do |s|
"This library implements test/unit compatible API on minitest. " +
"The test/unit means that test/unit which was bundled with Ruby 1.8."
s.executables = ["testrb"]
+
+ # Ruby bundled test/unit is a compatibility layer for minitest,
+ # and it doesn't have support for minitest 5.
+ s.add_runtime_dependency "minitest", '< 5.0.0'
end