diff --git a/requirements.txt b/requirements.txt
index 69498d0..fe39992 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,19 +1,19 @@
 -e git://github.com/mvcisback/hypothesis-cfg@master#egg=hypothesis-cfg
 -e git://github.com/mvcisback/DiscreteSignals@master#egg=discrete-signals
-attrs==18.1.0
-funcy==1.9.1
+attrs==18.2.0
+funcy==1.10.3
 lenses==0.4.0
-parsimonious==0.7.0
-hypothesis==3.32.1
+parsimonious==0.8.1
+hypothesis==3.73.0
 
-pytest==3.2.3
+pytest==3.8.1
 pytest-bpdb==0.1.4
 pytest-cache==1.0
 pytest-colordots==1.1
-pytest-cov==2.5.1
-pytest-flake8==0.9
+pytest-cov==2.6.0
+pytest-flake8==1.0.2
 pytest-forked==0.2
-pytest-isort==0.1.0
+pytest-isort==0.2.1
 pytest-pep8==1.0.6
-pytest-xdist==1.20.1
-python-dateutil==2.6.1
+pytest-xdist==1.23.0
+python-dateutil==2.7.3