diff --git a/Gemfile b/Gemfile
index 1911a67..f05bc92 100644
--- a/Gemfile
+++ b/Gemfile
@@ -17,6 +17,6 @@ gem 'saml_idp'
 gem 'xmlenc'
 
 # Sinatra gems
-gem 'sinatra', '~> 2.2'
-gem 'sinatra-contrib', '~> 2.2'
+gem 'sinatra', '~> 3.0'
+gem 'sinatra-contrib', '~> 3.0'
 gem 'sinatra-reloader', '~> 1.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index 3f0fb0d..18d6c94 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -20,7 +20,7 @@ GEM
       concurrent-ruby (~> 1.0)
     minitest (5.15.0)
     multi_json (1.15.0)
-    mustermann (1.1.1)
+    mustermann (3.0.0)
       ruby2_keywords (~> 0.0.1)
     nio4r (2.5.8)
     nokogiri (1.13.6-x86_64-darwin)
@@ -30,8 +30,8 @@ GEM
     puma (5.6.4)
       nio4r (~> 2.0)
     racc (1.6.0)
-    rack (2.2.3.1)
-    rack-protection (2.2.0)
+    rack (2.2.4)
+    rack-protection (3.0.4)
       rack
     rexml (3.2.5)
     ruby2_keywords (0.0.5)
@@ -41,22 +41,22 @@ GEM
       nokogiri (>= 1.6.2)
       rexml
       xmlenc (>= 0.7.1)
-    sinatra (2.2.0)
-      mustermann (~> 1.0)
-      rack (~> 2.2)
-      rack-protection (= 2.2.0)
+    sinatra (3.0.4)
+      mustermann (~> 3.0)
+      rack (~> 2.2, >= 2.2.4)
+      rack-protection (= 3.0.4)
       tilt (~> 2.0)
-    sinatra-contrib (2.2.0)
+    sinatra-contrib (3.0.4)
       multi_json
-      mustermann (~> 1.0)
-      rack-protection (= 2.2.0)
-      sinatra (= 2.2.0)
+      mustermann (~> 3.0)
+      rack-protection (= 3.0.4)
+      sinatra (= 3.0.4)
       tilt (~> 2.0)
     sinatra-reloader (1.0)
       sinatra-contrib
     temple (0.8.2)
     thor (1.2.1)
-    tilt (2.0.10)
+    tilt (2.0.11)
     tzinfo (2.0.4)
       concurrent-ruby (~> 1.0)
     xmlenc (0.8.0)
@@ -77,8 +77,8 @@ DEPENDENCIES
   hamlit (~> 2.16)
   puma (~> 5.6)
   saml_idp
-  sinatra (~> 2.2)
-  sinatra-contrib (~> 2.2)
+  sinatra (~> 3.0)
+  sinatra-contrib (~> 3.0)
   sinatra-reloader (~> 1.0)
   xmlenc
   zeitwerk (~> 2.6)