diff --git a/tasks/release.rb b/tasks/release.rb
index d394b181c3..8fb151ceb4 100644
--- a/tasks/release.rb
+++ b/tasks/release.rb
@@ -186,7 +186,7 @@ task :announce do
       raise "Only valid for patch releases"
     end
 
-    sums = "$ shasum *-#{version}.gem\n" + `shasum *-#{version}.gem`
+    sums = "$ shasum -a 256 *-#{version}.gem\n" + `shasum -a 256 *-#{version}.gem`
 
     puts "Hi everyone,"
     puts
@@ -232,7 +232,7 @@ GitHub](https://github.com/rails/rails/compare/v#{previous_version}...v#{version
 ## SHA-1
 
 If you'd like to verify that your gem is the same as the one I've uploaded,
-please use these SHA-1 hashes.
+please use these SHA-256 hashes.
 
 Here are the checksums for #{version}: