diff --git a/Gemfile b/Gemfile
index 6bfb873c159a293e2ded97cf64c86655c5fcd495..1d4e87ee2218adc52f8345ad52055ed7237d86cf 100644
--- a/Gemfile
+++ b/Gemfile
@@ -311,7 +311,7 @@ group :metrics do
   gem 'influxdb', '~> 0.2', require: false
 
   # Prometheus
-  gem 'prometheus-client-mmap', '~> 0.9.8'
+  gem 'prometheus-client-mmap', '~> 0.9.9'
   gem 'raindrops', '~> 0.18'
 end
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 451348af2800975237b58e4d643adf72789dfec6..f03707983742865aaa9b32e0d1dfbe83d5d0fe4a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -650,7 +650,7 @@ GEM
       parser
       unparser
     procto (0.0.3)
-    prometheus-client-mmap (0.9.8)
+    prometheus-client-mmap (0.9.9)
     pry (0.11.3)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
@@ -1170,7 +1170,7 @@ DEPENDENCIES
   org-ruby (~> 0.9.12)
   pg (~> 1.1)
   premailer-rails (~> 1.9.7)
-  prometheus-client-mmap (~> 0.9.8)
+  prometheus-client-mmap (~> 0.9.9)
   pry-byebug (~> 3.5.1)
   pry-rails (~> 0.3.4)
   puma (~> 3.12)