diff --git a/web/lib/potato_mesh/config.rb b/web/lib/potato_mesh/config.rb
index fa43ad7..8101b2e 100644
--- a/web/lib/potato_mesh/config.rb
+++ b/web/lib/potato_mesh/config.rb
@@ -42,6 +42,7 @@ module PotatoMesh
     DEFAULT_FEDERATION_WORKER_QUEUE_CAPACITY = 128
     DEFAULT_FEDERATION_TASK_TIMEOUT_SECONDS = 120
     DEFAULT_INITIAL_FEDERATION_DELAY_SECONDS = 2
+    DEFAULT_FEDERATION_SEED_DOMAINS = %w[potatomesh.net potatomesh.jmrp.io].freeze
 
     # Retrieve the configured API token used for authenticated requests.
     #
@@ -409,7 +410,7 @@ module PotatoMesh
     #
     # @return [Array<String>] list of default seed domains.
     def federation_seed_domains
-      ["potatomesh.net"].freeze
+      DEFAULT_FEDERATION_SEED_DOMAINS
     end
 
     # Determine how often we broadcast federation announcements.
diff --git a/web/spec/app_spec.rb b/web/spec/app_spec.rb
index b099b88..9d1382e 100644
--- a/web/spec/app_spec.rb
+++ b/web/spec/app_spec.rb
@@ -1080,7 +1080,8 @@ RSpec.describe "Potato Mesh Sinatra app" do
 
       targets = application_class.federation_target_domains("self.mesh")
 
-      expect(targets.first).to eq("potatomesh.net")
+      seed_domains = PotatoMesh::Config.federation_seed_domains.map(&:downcase)
+      expect(targets.first(seed_domains.length)).to eq(seed_domains)
       expect(targets).to include("remote.mesh")
       expect(targets).not_to include("self.mesh")
     end
@@ -1090,7 +1091,7 @@ RSpec.describe "Potato Mesh Sinatra app" do
 
       targets = application_class.federation_target_domains("self.mesh")
 
-      expect(targets).to eq(["potatomesh.net"])
+      expect(targets).to eq(PotatoMesh::Config.federation_seed_domains.map(&:downcase))
     end
 
     it "ignores remote instances that have not updated within a week" do
@@ -1118,7 +1119,7 @@ RSpec.describe "Potato Mesh Sinatra app" do
 
       targets = application_class.federation_target_domains("self.mesh")
 
-      expect(targets).to eq(["potatomesh.net"])
+      expect(targets).to eq(PotatoMesh::Config.federation_seed_domains.map(&:downcase))
     end
   end