diff --git a/lib/net/net-imap.gemspec b/lib/net/net-imap.gemspec
index d0916ae897..5c26a8d512 100644
--- a/lib/net/net-imap.gemspec
+++ b/lib/net/net-imap.gemspec
@@ -32,4 +32,6 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
 
   spec.add_dependency "net-protocol"
+  # spec.add_dependency "digest"
+  spec.add_dependency "strscan"
 end