diff --git a/.circleci/config.yml b/.circleci/config.yml
index a56a907dd4..da8c8468a7 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -15,8 +15,12 @@ jobs:
           name: Write deps cache key
           command: cat "$REQUIREMENTS_FILE" > reqs.txt
 
+      - run:
+          name: Write job name
+          command: echo $CIRCLE_JOB > circlejob.txt
+
       - restore_cache:
-          key: deps1-{{ .Branch }}-{{ checksum "reqs.txt" }}
+          key: deps1-{{ .Branch }}-{{ checksum "reqs.txt" }}-{{ checksum ".circleci/config.yml" }}-{{ checksum "circlejob.txt" }}
 
       - run:
           name: Install dependencies
@@ -27,7 +31,7 @@ jobs:
               pip install -r $REQUIREMENTS_FILE
 
       - save_cache:
-          key: deps1-{{ .Branch }}-{{ checksum "reqs.txt" }}
+          key: deps1-{{ .Branch }}-{{ checksum "reqs.txt" }}-{{ checksum ".circleci/config.yml" }}-{{ checksum "circlejob.txt" }}
           paths:
               - "venv"
 
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5e8d53aab6..afc2e17244 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.26.4 - 2018-08-28
+## Fixed
+- Set `url_base_pathname` to `None` in `Dash.__init__`. Fix [#364](https://github.com/plotly/dash/issues/364)
+
 ## 0.26.3 - 2018-08-27
 ## Fixed
 - Prefix assets files with `requests_pathname_prefix`. [#351](https://github.com/plotly/dash/pull/351)
diff --git a/dash/dash.py b/dash/dash.py
index 8177761082..a8414203cc 100644
--- a/dash/dash.py
+++ b/dash/dash.py
@@ -76,7 +76,7 @@ def __init__(
             assets_url_path='/assets',
             assets_ignore='',
             include_assets_files=True,
-            url_base_pathname='/',
+            url_base_pathname=None,
             assets_external_path=None,
             requests_pathname_prefix=None,
             routes_pathname_prefix=None,
diff --git a/dash/version.py b/dash/version.py
index be363825ce..cddea31832 100644
--- a/dash/version.py
+++ b/dash/version.py
@@ -1 +1 @@
-__version__ = '0.26.3'
+__version__ = '0.26.4'
diff --git a/dev-requirements-py37.txt b/dev-requirements-py37.txt
index 0f3238c436..645a65767e 100644
--- a/dev-requirements-py37.txt
+++ b/dev-requirements-py37.txt
@@ -1,5 +1,5 @@
 dash_core_components>=0.27.2
-dash_html_components>=0.12.0rc3
+dash_html_components>=0.12.0
 dash-flow-example==0.0.3
 dash-dangerously-set-inner-html
 dash_renderer
diff --git a/requirements.txt b/requirements.txt
index 4eb352abdc..56b2b5adc3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@ appnope==0.1.0
 backports.shutil-get-terminal-size==1.0.0
 click==6.7
 dash-core-components==0.3.3
-dash-html-components==0.11.0rc1
+dash-html-components==0.12.0
 dash-renderer==0.2.9
 dash.ly==0.14.0
 decorator==4.0.11