diff --git a/nyroglancer/extension.py b/nyroglancer/extension.py
index 2bbda77..d4f2bb3 100644
--- a/nyroglancer/extension.py
+++ b/nyroglancer/extension.py
@@ -22,7 +22,7 @@ def get(self):
 
 class MainBundle(IPythonHandler):
     def get(self):
-        self.write(main_js.replace("chunk_worker.bundle.js", "js/neuroglancer/chunk_worker.bundle.js"))
+        self.write(main_js.replace("chunk_worker.bundle.js".encode('utf8'), "js/neuroglancer/chunk_worker.bundle.js".encode('utf8')))
         self.set_header("Content-Type", "application/javascript")
 
 class ChunkWorkerBundle(IPythonHandler):
diff --git a/nyroglancer/intrusion.py b/nyroglancer/intrusion.py
index ac51fbd..c553097 100644
--- a/nyroglancer/intrusion.py
+++ b/nyroglancer/intrusion.py
@@ -1,4 +1,5 @@
 from jupyter_client import BlockingKernelClient
+import sys
 
 clients = {}
 
@@ -58,7 +59,12 @@ def evaluate(kernel_client, expression):
                 result['evalue'] + "\n\n" +
                 "\n\t".join(result['traceback']))
 
-    data = result['data'].values()[0].strip().strip('\'').decode('string-escape')
+    raw_data = result['data'].values()[0].strip().strip('\'')
+    # python3
+    if sys.version_info[0] == 3:
+        data = bytes(raw_data, 'utf8').decode('unicode_escape')
+    else:
+        data = raw_data.decode('string_escape')
 
     #print "[nyroglancer] return data part (between >>> and <<<):\n\t>>>" + str(data) + "<<<\n"
 
diff --git a/nyroglancer/viewer.py b/nyroglancer/viewer.py
index 9004525..35b60a7 100644
--- a/nyroglancer/viewer.py
+++ b/nyroglancer/viewer.py
@@ -3,9 +3,9 @@
 from tornado.escape import url_escape
 from tornado.httpclient import HTTPClient
 import collections
-import intrusion
+import nyroglancer.intrusion
 import json
-import ndstore
+import nyroglancer.ndstore
 import neuroglancer
 import urllib
 
@@ -54,7 +54,7 @@ def register_volume(self, volume):
         cf = url_escape(find_connection_file())
         http_client= HTTPClient()
         try:
-            response = http_client.fetch(self.get_server_url() + '/register_token/' + volume.token.decode('utf8') + '/' + cf)
+            response = http_client.fetch(self.get_server_url() + '/register_token/' + volume.token.decode('utf8') + '/'+ cf)
         except Exception as e:
             raise RuntimeError("could not register token: " + str(e))
         http_client.close()
diff --git a/requirements.txt b/requirements.txt
index 761fa09..d52dac9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,3 @@
 jupyter
 neuroglancer>=0.0.6
+request