diff --git a/Gemfile b/Gemfile
index 1ed43f4..95746ee 100644
--- a/Gemfile
+++ b/Gemfile
@@ -42,7 +42,7 @@ gem "bootsnap", require: false
 # of accepting a positional options hash. ActiveSupport::Messages::Metadata#deserialize_from_json
 # (in activesupport 8.1.3.1) still calls JSON.parse(payload, some_hash) the old, positional way.
 # Pin json back to a 2.x release in your Gemfile until Rails ships a compatible activesupport patch.
-gem "json", "~> 2.9"
+gem "json", "~> 3.1"
 
 gem "haml"
 gem "bootstrap", "~> 5.3", ">= 5.3.2"
diff --git a/Gemfile.lock b/Gemfile.lock
index f7912ac..ebcc46c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -192,7 +192,7 @@ GEM
       prism (>= 1.3.0)
       rdoc (>= 4.0.0)
       reline (>= 0.4.2)
-    json (2.21.2)
+    json (3.1.0)
     kaminari (1.3.2)
       activesupport (>= 4.1.0)
       kaminari-actionview (= 1.3.2)
@@ -404,7 +404,7 @@ DEPENDENCIES
   geokit-rails
   haml
   importmap-rails
-  json (~> 2.9)
+  json (~> 3.1)
   kaminari
   letter_opener
   pg