diff --git a/etc/python2.7-environment.yml b/etc/python2.7-environment.yml
index 3835d7d4..697c0742 100644
--- a/etc/python2.7-environment.yml
+++ b/etc/python2.7-environment.yml
@@ -5,7 +5,6 @@ channels:
 dependencies:
 - certifi=2016.2.28=py27_0
 - mkl=2017.0.3
-- matplotlib=2.1.2=py36_0
 - numpy=1.13.1=py27_0
 - openssl=1.0.2l
 - pip=9.0.1=py27_1
@@ -40,7 +39,7 @@ dependencies:
   - lru-dict==1.1.6
   - mako==1.0.7
   - markupsafe==1.0
-  - matplotlib==2.1.0
+  - matplotlib==2.1.2
   - multipledispatch==0.4.9
   - networkx==2.0
   - numexpr==2.6.4