diff --git a/Gemfile b/Gemfile
index 7bd0b16474c2f981ad131ec102b590f3c8f00dd0..8d168061ea5b7fef30cbba786915893622d6dcdb 100644
--- a/Gemfile
+++ b/Gemfile
@@ -333,7 +333,7 @@ gem 'snowplow-tracker', '~> 0.6.1'
 # Metrics
 gem 'method_source', '~> 1.0', require: false
 gem 'webrick', '~> 1.6.1', require: false
-gem 'prometheus-client-mmap', '~> 0.14.0', require: 'prometheus/client'
+gem 'prometheus-client-mmap', '~> 0.15.0', require: 'prometheus/client'
 
 gem 'warning', '~> 1.2.0'
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 4c56e9980187865685bf2c982fca4df2f3a9a739..9f0b87d67a47cf963a8dcb83536bc87162a21bab 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -925,7 +925,7 @@ GEM
       coderay
       parser
       unparser
-    prometheus-client-mmap (0.14.0)
+    prometheus-client-mmap (0.15.0)
     pry (0.13.1)
       coderay (~> 1.1)
       method_source (~> 1.0)
@@ -1574,7 +1574,7 @@ DEPENDENCIES
   pg_query (~> 2.1)
   png_quantizator (~> 0.2.1)
   premailer-rails (~> 1.10.3)
-  prometheus-client-mmap (~> 0.14.0)
+  prometheus-client-mmap (~> 0.15.0)
   pry-byebug
   pry-rails (~> 0.3.9)
   pry-shell (~> 0.4.0)