diff --git a/Gemfile b/Gemfile
index 90abfd30900f7f9864cb089d0169ff873e14f41f..8602e30de7f976f839d56651653e94f8f9d09e62 100644
--- a/Gemfile
+++ b/Gemfile
@@ -330,7 +330,7 @@ group :metrics do
   gem 'method_source', '~> 1.0', require: false
 
   # Prometheus
-  gem 'prometheus-client-mmap', '~> 0.11.0'
+  gem 'prometheus-client-mmap', '~> 0.12.0'
   gem 'raindrops', '~> 0.18'
 end
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 7d743f2029ebe7f37d0a1c045fa585835ffbefd9..dc5d22f891a8eabf9a72c9f3b12a728f0ebbd125 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -838,7 +838,7 @@ GEM
       parser
       unparser
     procto (0.0.3)
-    prometheus-client-mmap (0.11.0)
+    prometheus-client-mmap (0.12.0)
     pry (0.13.1)
       coderay (~> 1.1)
       method_source (~> 1.0)
@@ -1419,7 +1419,7 @@ DEPENDENCIES
   pg (~> 1.1)
   png_quantizator (~> 0.2.1)
   premailer-rails (~> 1.10.3)
-  prometheus-client-mmap (~> 0.11.0)
+  prometheus-client-mmap (~> 0.12.0)
   pry-byebug (~> 3.9.0)
   pry-rails (~> 0.3.9)
   rack (~> 2.0.9)