diff --git a/packages/aether_observatory/spec/aether_observatory/event_base_spec.rb b/packages/aether_observatory/spec/aether_observatory/event_base_spec.rb
index 2886ee3d..12082b77 100644
--- a/packages/aether_observatory/spec/aether_observatory/event_base_spec.rb
+++ b/packages/aether_observatory/spec/aether_observatory/event_base_spec.rb
@@ -4,8 +4,6 @@
 
 module AetherObservatory
   RSpec.describe EventBase do
-    after(:each) { teardown }
-
     describe ".create" do
       it "sends event to a single observer" do
         # Given
@@ -22,6 +20,9 @@ module AetherObservatory
 
         # Then
         expect(observer.returned_payload.message).to eq("message")
+
+        # Teardown
+        observer.stop
       end
 
       it "sends event to multiple observers", :aggregate_failures do
@@ -45,6 +46,10 @@ module AetherObservatory
         # Then
         expect(observer_zero.returned_payload.message).to eq("message")
         expect(observer_both.returned_payload.message).to eq("message")
+
+        # Teardown
+        observer_zero.stop
+        observer_both.stop
       end
 
       it "sends event to only one of multiple observers", :aggregate_failures do
@@ -68,6 +73,10 @@ module AetherObservatory
         # Then
         expect(observer_zero.returned_payload).to eq(nil)
         expect(observer_both.returned_payload.message).to eq("message")
+
+         # Teardown
+         observer_zero.stop
+         observer_both.stop
       end
 
       context "without a prefix" do
@@ -85,6 +94,9 @@ module AetherObservatory
 
           # Then
           expect(observer.returned_payload.message).to eq("message")
+
+          # Teardown
+          observer.stop
         end
       end
     end
@@ -122,10 +134,5 @@ def process
         end
       )
     end
-
-    def teardown
-      ActiveSupport::Notifications.notifier =
-        ActiveSupport::Notifications::Fanout.new
-    end
   end
 end
diff --git a/packages/aether_observatory/spec/aether_observatory/observer_base_spec.rb b/packages/aether_observatory/spec/aether_observatory/observer_base_spec.rb
index 01758f1a..d1d9a587 100644
--- a/packages/aether_observatory/spec/aether_observatory/observer_base_spec.rb
+++ b/packages/aether_observatory/spec/aether_observatory/observer_base_spec.rb
@@ -4,8 +4,6 @@
 
 module AetherObservatory
   RSpec.describe ObserverBase do
-    after(:each) { teardown }
-
     describe "#process" do
       it "processes a single event" do
         # Given
@@ -19,6 +17,9 @@ module AetherObservatory
 
         # Then
         expect(observer.returned_payload.message).to eq("message")
+
+        # Teardown
+        observer.stop
       end
 
       it "processed multiple events", :aggregate_failures do
@@ -40,6 +41,9 @@ module AetherObservatory
 
         # Then
         expect(observer.returned_payload.message).to eq("message one")
+
+        # Teardown
+        observer.stop
       end
     end
 
@@ -56,6 +60,9 @@ module AetherObservatory
 
         # Then
         expect(observer.returned_payload).to eq(nil)
+
+        # Teardown
+        observer.stop
       end
     end
 
@@ -72,6 +79,9 @@ module AetherObservatory
 
         # Then
         expect(observer.returned_payload.message).to eq("message")
+
+        # Teardown
+        observer.stop
       end
     end
 
@@ -104,10 +114,5 @@ def process
         end
       )
     end
-
-    def teardown
-      ActiveSupport::Notifications.notifier =
-        ActiveSupport::Notifications::Fanout.new
-    end
   end
 end