diff --git a/Gemfile.lock b/Gemfile.lock
index c2fad639..5755417c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -6,7 +6,7 @@ PATH
       metriks (~> 0.9)
       redis (~> 4.4.0)
       rusage (~> 0.2.0)
-      sinatra (>= 1.3, <= 2.2)
+      sinatra (>= 1.3, <= 2.2.3)
       statsd-ruby (~> 1.3)
       thin (~> 1.7)
       thor
@@ -114,7 +114,7 @@ GEM
       multi_json (~> 1.0)
       simplecov-html (~> 0.7.1)
     simplecov-html (0.7.1)
-    sinatra (2.2.0)
+    sinatra (2.2.3)
       mustermann (~> 1.0)
       rack (~> 2.2)
       rack-protection (= 2.2.0)
diff --git a/qless.gemspec b/qless.gemspec
index 030ea30e..614fbe3b 100644
--- a/qless.gemspec
+++ b/qless.gemspec
@@ -39,7 +39,7 @@ language-specific extension will also remain up to date.
   s.add_dependency 'metriks', '~> 0.9'
   s.add_dependency 'redis', ['~> 4.4.0']
   s.add_dependency 'rusage', '~> 0.2.0'
-  s.add_dependency 'sinatra', ['>= 1.3', '<= 2.2']
+  s.add_dependency 'sinatra', ['>= 1.3', '<= 2.2.3']
   s.add_dependency 'statsd-ruby', '~> 1.3'
   s.add_dependency 'thin', '~> 1.7'
   s.add_dependency 'thor'