diff --git a/lib/sidekiq/limit_fetch/global/selector.rb b/lib/sidekiq/limit_fetch/global/selector.rb
index 1884fc4..9809a09 100644
--- a/lib/sidekiq/limit_fetch/global/selector.rb
+++ b/lib/sidekiq/limit_fetch/global/selector.rb
@@ -34,11 +34,11 @@ module Sidekiq::LimitFetch::Global
     end
 
     def redis_acquire_sha
-      @acquire_sha ||= Digest::SHA1.hexdigest redis_acquire_script
+      @acquire_sha ||= OpenSSL::Digest::SHA1.hexdigest redis_acquire_script
     end
 
     def redis_release_sha
-      @release_sha ||= Digest::SHA1.hexdigest redis_release_script
+      @release_sha ||= OpenSSL::Digest::SHA1.hexdigest redis_release_script
     end
 
     def redis_acquire_script