diff --git a/requirements.txt b/requirements.txt
index db768e8..a4d168a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -25,7 +25,7 @@ more-itertools==4.3.0     # via pytest
 numpy==1.15.2             # via matplotlib, pandas, patsy, scipy, ta-lib
 pandas==0.23.4
 patsy==0.5.0              # via statsmodels
-pluggy==0.7.1             # via pytest
+pluggy==0.13.0             # via pytest
 prettytable==7        # via mootdx
 py==1.6.0                 # via pytest
 pycparser==2.19           # via cffi