diff --git a/requirements.txt b/requirements.txt
index bbbdbf6..538d11a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,13 +1,31 @@
-gnureadline==6.3.3
-ipython==3.2.1
-Jinja2==2.7.3
-jsonschema==2.5.1
-MarkupSafe==0.23
-mistune==0.6
-nose==1.3.7
-ptyprocess==0.5
-Pygments==2.0.2
-pyzmq==14.7.0
-terminado==0.5
-tornado==4.2
-enum34==1.0.4
+appnope>=0.1.0,<1.0.0
+backports.shutil-get-terminal-size>=1.0.0,<2.0.0
+decorator>=4.0.9,<5.0.0
+entrypoints>=0.2.2,<1.0.0
+enum34>=1.1.6,<2.0.0
+gnureadline>=6.3.3,<7.0.0
+ipykernel>=4.3.1,<5.0.0
+ipython>=4.2.0,<5.0.0
+ipython-genutils>=0.1.0,<1.0.0
+ipywidgets>=5.1.5,<6.0.0
+Jinja2>=2.8,<3.0.0
+jsonschema>=2.5.1,<3.0.0
+jupyter-client>=4.2.2,<5.0.0
+jupyter-core>=4.1.0,<5.0.0
+MarkupSafe>=0.23,<1.0.0
+mistune>=0.7.2,<1.0.0
+nbconvert>=4.2.0,<5.0.0
+nbformat>=4.0.1,<5.0.0
+nose>=1.3.7,<2.0.0
+notebook>=4.2.1,<5.0.0
+pexpect>=4.1.0,<5.0.0
+pickleshare>=0.7.2,<1.0.0
+ptyprocess>=0.5.1,<1.0.0
+Pygments>=2.1.3,<3.0.0
+pyzmq>=15.2.0,<16.0.0
+simplegeneric>=0.8.1,<1.0.0
+terminado>=0.6,<1.0.0
+tornado>=4.3,<5.0.0
+traitlets>=4.2.1,<5.0.0
+wheel>=0.24.0,<1.0.0
+widgetsnbextension>=1.2.3,<2.0.0