diff --git a/requirements.txt b/requirements.txt
index 47365ee..9fd2bd1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,21 +7,16 @@
 certifi==2017.1.23
 cffi==1.9.1               # via cryptography
 contexttimer==0.3.3
-cryptography==1.7.2
+cryptography==2.8
 cycler==0.10.0            # via matplotlib
-enum34==1.1.6             # via cryptography
-functools32==3.2.3.post2  # via matplotlib
-futures==3.0.5            # via requests-futures
 gitdb2==2.0.0             # via gitpython
 gitpython==2.1.1
 idna==2.2
-ipaddress==1.0.18         # via cryptography
 matplotlib==2.0.0
 mpld3==0.3
 numpy==1.10.4
-pyasn1==0.2.2             # via cryptography
 pycparser==2.17           # via cffi
-pyopenssl==16.2.0
+pyopenssl==17.5.0
 pyparsing==2.1.10         # via matplotlib
 python-dateutil==2.5.1
 pytz==2016.4              # via matplotlib
@@ -31,8 +26,4 @@ requests==2.13.0
 scipy==0.17.0
 six==1.10.0               # via cryptography, cycler, matplotlib, pyopenssl, python-dateutil
 smmap2==2.0.1             # via gitdb2
-subprocess32==3.2.7       # via matplotlib
 tqdm==4.11.2
-
-# The following packages are considered to be unsafe in a requirements file:
-# setuptools                # via cryptography