diff --git a/.mutant.yml b/.mutant.yml
index 456ba55..a746965 100644
--- a/.mutant.yml
+++ b/.mutant.yml
@@ -14,3 +14,4 @@ mutation:
   timeout: 10.0
 requires:
 - x
+usage: opensource
diff --git a/Gemfile b/Gemfile
index 7d25c58..bdd6540 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,7 @@ source "https://rubygems.org"
 gemspec
 
 gem "minitest", ">= 5.19"
-gem "mutant-license", source: "https://oss:b78oB5NQSVVIXx8WVdyC4sYf4qvTUqso@gem.mutant.dev"
+gem "mutant", ">= 0.12"
 gem "mutant-minitest", ">= 0.11.24"
 gem "rake", ">= 13.0.6"
 gem "rbs", ">= 3.2.1"