diff --git a/.circleci/config.yml b/.circleci/config.yml
index 5214584a..0e8fd9d1 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -7,7 +7,7 @@ apt-run: &apt-install
 docs-install: &docs-install
   name: Install Python dependencies
   command: |
-    pip install werkzeug sphinx alabaster invoke python-dateutil sphinx-automodapi nbsphinx ipython
+    pip install werkzeug==0.16.1 sphinx alabaster invoke python-dateutil sphinx-automodapi nbsphinx==0.4.3 ipython
 
 version: 2
 jobs:
diff --git a/.travis.yml b/.travis.yml
index bcf33b99..7947419b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -20,7 +20,7 @@ env:
   global:
     - LOCALE=default
     - CONDA_CHANNELS="conda-forge"
-    - CONDA_DEPENDENCIES="sphinx werkzeug alabaster invoke graphviz nbsphinx"
+    - CONDA_DEPENDENCIES="sphinx werkzeug==0.16.1 alabaster invoke graphviz nbsphinx==0.4.3"
     - PIP_DEPENDENCIES="sphinx-automodapi"
 
 install:
diff --git a/Makefile b/Makefile
index 2f3ef825..70ab9d0d 100644
--- a/Makefile
+++ b/Makefile
@@ -25,4 +25,4 @@ test4:
 test5:
 	set -e; mkdir -p testablog; printf "testablog\nABlog\nABlog Team\nhttps://ablog.readthedocs.org" | ablog start; cd testablog; ablog build; cd ../..; rm -rf test
 
-tests: test test1 test2 test3 test4 test5 demo
+tests: test test1 test2 test3 test4 test5
diff --git a/appveyor.yml b/appveyor.yml
index bc0591ba..89ad3221 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -29,7 +29,7 @@ install:
     - cmd: conda update conda --quiet
     - cmd: conda config --add channels conda-forge
     - cmd: conda config --set channel_priority strict
-    - cmd: conda install sphinx werkzeug alabaster invoke graphviz nbsphinx --quiet
+    - cmd: conda install sphinx werkzeug==0.16.1 alabaster invoke graphviz nbsphinx==0.4.3 --quiet
     - cmd: python -m pip install --upgrade pip
     - cmd: pip install -e .[all]
 
diff --git a/setup.cfg b/setup.cfg
index e6d70378..0597d5f9 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -27,7 +27,7 @@ install_requires =
 [options.extras_require]
 notebook =
   ipython
-  nbsphinx
+  nbsphinx<0.5.0
 
 [options.entry_points]
 console_scripts =