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-rw-r--r--lib/csv/csv.gemspec1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/csv/csv.gemspec b/lib/csv/csv.gemspec
index b2ed581b2a..7900ca2f54 100644
--- a/lib/csv/csv.gemspec
+++ b/lib/csv/csv.gemspec
@@ -48,6 +48,7 @@ Gem::Specification.new do |spec|
spec.required_ruby_version = ">= 2.3.0"
+ spec.add_dependency "stringio", ">= 0.1.3"
spec.add_development_dependency "bundler"
spec.add_development_dependency "rake"
spec.add_development_dependency "benchmark_driver"