diff --git a/src/emailservice/email_client.py b/src/emailservice/email_client.py
index 32593fe..c31f4ef 100644
--- a/src/emailservice/email_client.py
+++ b/src/emailservice/email_client.py
@@ -22,20 +22,20 @@ import demo_pb2_grpc
 from logger import getJSONLogger
 logger = getJSONLogger('emailservice-client')
 
-# from opencensus.trace.tracer import Tracer
-# from opencensus.trace.exporters import stackdriver_exporter
-# from opencensus.trace.ext.grpc import client_interceptor
+from opencensus.trace.tracer import Tracer
+from opencensus.trace.exporters import stackdriver_exporter
+from opencensus.trace.ext.grpc import client_interceptor
 
-# try:
-#     exporter = stackdriver_exporter.StackdriverExporter()
-#     tracer = Tracer(exporter=exporter)
-#     tracer_interceptor = client_interceptor.OpenCensusClientInterceptor(tracer, host_port='0.0.0.0:8080')
-# except:
-#     tracer_interceptor = client_interceptor.OpenCensusClientInterceptor()
+try:
+    exporter = stackdriver_exporter.StackdriverExporter()
+    tracer = Tracer(exporter=exporter)
+    tracer_interceptor = client_interceptor.OpenCensusClientInterceptor(tracer, host_port='0.0.0.0:8080')
+except:
+    tracer_interceptor = client_interceptor.OpenCensusClientInterceptor()
 
 def send_confirmation_email(email, order):
   channel = grpc.insecure_channel('0.0.0.0:8080')
-  # channel = grpc.intercept_channel(channel, tracer_interceptor)
+  channel = grpc.intercept_channel(channel, tracer_interceptor)
   stub = demo_pb2_grpc.EmailServiceStub(channel)
   try:
     response = stub.SendOrderConfirmation(demo_pb2.SendOrderConfirmationRequest(
diff --git a/src/emailservice/email_server.py b/src/emailservice/email_server.py
index 676b70e..f4a2162 100644
--- a/src/emailservice/email_server.py
+++ b/src/emailservice/email_server.py
@@ -28,19 +28,18 @@ import demo_pb2_grpc
 from grpc_health.v1 import health_pb2
 from grpc_health.v1 import health_pb2_grpc
 
-# from opencensus.trace.ext.grpc import server_interceptor
-# from opencensus.trace.samplers import always_on
-# from opencensus.trace.exporters import stackdriver_exporter
-# from opencensus.trace.exporters import print_exporter
+from opencensus.trace.exporters import stackdriver_exporter
+from opencensus.trace.ext.grpc import server_interceptor
+from opencensus.trace.samplers import always_on
 
 # import googleclouddebugger
 
-# try:
-#     sampler = always_on.AlwaysOnSampler()
-#     exporter = stackdriver_exporter.StackdriverExporter()
-#     tracer_interceptor = server_interceptor.OpenCensusServerInterceptor(sampler, exporter)
-# except:
-#     tracer_interceptor = server_interceptor.OpenCensusServerInterceptor()
+try:
+    sampler = always_on.AlwaysOnSampler()
+    exporter = stackdriver_exporter.StackdriverExporter()
+    tracer_interceptor = server_interceptor.OpenCensusServerInterceptor(sampler, exporter)
+except:
+    tracer_interceptor = server_interceptor.OpenCensusServerInterceptor()
 
 # try:
 #     googleclouddebugger.enable(
@@ -123,7 +122,8 @@ class HealthCheck():
       status=health_pb2.HealthCheckResponse.SERVING)
 
 def start(dummy_mode):
-  server = grpc.server(futures.ThreadPoolExecutor(max_workers=10))#, interceptors=(tracer_interceptor,))
+  server = grpc.server(futures.ThreadPoolExecutor(max_workers=10),
+                       interceptors=(tracer_interceptor,))
   service = None
   if dummy_mode:
     service = DummyEmailService()
diff --git a/src/emailservice/requirements.txt b/src/emailservice/requirements.txt
index 17f0799..8737071 100644
--- a/src/emailservice/requirements.txt
+++ b/src/emailservice/requirements.txt
@@ -14,7 +14,7 @@ google-cloud-core==0.28.1
 google-cloud-trace==0.19.0
 googleapis-common-protos==1.5.3
 grpc-google-iam-v1==0.11.4
-grpcio==1.12.1
+grpcio==1.16.1
 grpcio-health-checking==1.12.1
 grpcio-tools==1.12.1
 idna==2.7
@@ -24,7 +24,7 @@ Jinja2==2.10
 keyring==15.1.0
 keyrings.alt==3.1
 MarkupSafe==1.0
-opencensus==0.1.7
+opencensus==0.1.8
 protobuf==3.6.1
 pyasn1==0.4.4
 pyasn1-modules==0.2.2
diff --git a/src/recommendationservice/recommendation_server.py b/src/recommendationservice/recommendation_server.py
index 09e6e0d..9714038 100644
--- a/src/recommendationservice/recommendation_server.py
+++ b/src/recommendationservice/recommendation_server.py
@@ -31,10 +31,10 @@ from logger import getJSONLogger
 logger = getJSONLogger('recommendationservice-server')
 
 # TODO(morganmclean,ahmetb) tracing currently disabled due to memory leak (see TODO below)
-# from opencensus.trace.ext.grpc import server_interceptor
-# from opencensus.trace.samplers import always_on
-# from opencensus.trace.exporters import stackdriver_exporter
-# from opencensus.trace.exporters import print_exporter
+from opencensus.trace.ext.grpc import server_interceptor
+from opencensus.trace.samplers import always_on
+from opencensus.trace.exporters import stackdriver_exporter
+from opencensus.trace.exporters import print_exporter
 
 class RecommendationService(demo_pb2_grpc.RecommendationServiceServicer):
     def ListRecommendations(self, request, context):
@@ -66,12 +66,12 @@ if __name__ == "__main__":
     # TODO(morganmclean,ahmetb) enabling the tracing interceptor/sampler below
     # causes an unbounded memory leak eventually OOMing the container.
     # ----
-    # try:
-    #     sampler = always_on.AlwaysOnSampler()
-    #     exporter = stackdriver_exporter.StackdriverExporter()
-    #     tracer_interceptor = server_interceptor.OpenCensusServerInterceptor(sampler, exporter)
-    # except:
-    #     tracer_interceptor = server_interceptor.OpenCensusServerInterceptor()
+    try:
+        sampler = always_on.AlwaysOnSampler()
+        exporter = stackdriver_exporter.StackdriverExporter()
+        tracer_interceptor = server_interceptor.OpenCensusServerInterceptor(sampler, exporter)
+    except:
+        tracer_interceptor = server_interceptor.OpenCensusServerInterceptor()
 
     try:
         googleclouddebugger.enable(