diff --git a/app/controllers/heartbeat_controller.rb b/app/controllers/heartbeat_controller.rb
index 23839bc..44a7889 100644
--- a/app/controllers/heartbeat_controller.rb
+++ b/app/controllers/heartbeat_controller.rb
@@ -2,8 +2,10 @@
 
 class HeartbeatController < ApplicationController
   def index
-    message = { data: { healthy: true } }
-
-    render(json: message)
+    render(
+      plain: "OK",
+      status: :ok,
+      content_type: "text/plain",
+    )
   end
 end
diff --git a/spec/requests/heartbeat_controller_spec.rb b/spec/requests/heartbeat_controller_spec.rb
index 37a1982..7a3f78d 100644
--- a/spec/requests/heartbeat_controller_spec.rb
+++ b/spec/requests/heartbeat_controller_spec.rb
@@ -13,15 +13,13 @@
     it "returns json" do
       get "/heartbeat"
 
-      expect(response.content_type).to(eq("application/json; charset=utf-8"))
+      expect(response.content_type).to(eq("text/plain; charset=utf-8"))
     end
 
     it "returns the expected data" do
       get "/heartbeat"
 
-      expected = { data: { healthy: true } }
-
-      expect(JSON.parse(response.body, symbolize_names: true)).to(eq(expected))
+      expect(response.body).to(eq("OK"))
     end
   end
 end