diff --git a/.changesets/ignore-hanami-errors-by-default.md b/.changesets/ignore-hanami-errors-by-default.md
new file mode 100644
index 00000000..6df18970
--- /dev/null
+++ b/.changesets/ignore-hanami-errors-by-default.md
@@ -0,0 +1,13 @@
+---
+bump: patch
+type: change
+---
+
+Ignore these Hanami errors by default:
+
+- Hanami::Router::NotAllowedError (for example: sending a GET request to POST endpoint)
+- Hanami::Router::NotFoundError
+
+They are usually errors you don't want to be notified about, so we ignore them by default now.
+
+Customize the `ignore_errors` config option to continue receiving these errors.
diff --git a/lib/appsignal/loaders/hanami.rb b/lib/appsignal/loaders/hanami.rb
index 6356bbd6..976b642f 100644
--- a/lib/appsignal/loaders/hanami.rb
+++ b/lib/appsignal/loaders/hanami.rb
@@ -9,7 +9,11 @@ def on_load
         hanami_app_config = ::Hanami.app.config
         register_config_defaults(
           :root_path => hanami_app_config.root.to_s,
-          :env => hanami_app_config.env
+          :env => hanami_app_config.env,
+          :ignore_errors => [
+            "Hanami::Router::NotAllowedError",
+            "Hanami::Router::NotFoundError"
+          ]
         )
       end
 
diff --git a/spec/lib/appsignal/loaders/hanami_spec.rb b/spec/lib/appsignal/loaders/hanami_spec.rb
index de14fde2..4a09dc72 100644
--- a/spec/lib/appsignal/loaders/hanami_spec.rb
+++ b/spec/lib/appsignal/loaders/hanami_spec.rb
@@ -8,7 +8,12 @@
           :name => :hanami,
           :root_path => Dir.pwd,
           :env => :test,
-          :options => {}
+          :options => {
+            :ignore_errors => [
+              "Hanami::Router::NotAllowedError",
+              "Hanami::Router::NotFoundError"
+            ]
+          }
         )
       end
     end