diff --git a/Gemfile b/Gemfile
index 57d9bb61a..6a18e5cfd 100644
--- a/Gemfile
+++ b/Gemfile
@@ -27,7 +27,7 @@ gem 'iri', '0.8.0'
 gem 'loog', '0.5.1'
 gem 'minitest', '5.25.1', require: false
 gem 'pgtk', '0.9.6'
-gem 'rack', '3.0.9.1'
+gem 'rack', '3.1.7'
 gem 'rack-ssl', '1.4.1'
 gem 'rack-test', '2.1.0'
 gem 'rake', '13.2.1', require: false
diff --git a/Gemfile.lock b/Gemfile.lock
index f33a901ad..881b65d44 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -127,7 +127,7 @@ GEM
     psych (5.1.2)
       stringio
     racc (1.8.1)
-    rack (3.0.9.1)
+    rack (3.1.7)
     rack-protection (4.0.0)
       base64 (>= 0.1.0)
       rack (>= 3.0.0, < 4)
@@ -280,7 +280,7 @@ DEPENDENCIES
   loog (= 0.5.1)
   minitest (= 5.25.1)
   pgtk (= 0.9.6)
-  rack (= 3.0.9.1)
+  rack (= 3.1.7)
   rack-ssl (= 1.4.1)
   rack-test (= 2.1.0)
   rake (= 13.2.1)