diff --git a/requirements_dev.txt b/requirements_dev.txt
index 7629dabd..bc7a2e05 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -7,7 +7,7 @@ future==0.16.0
 gunicorn==19.7.1
 nose==1.3.7
 numpy==1.13.1
-pluggy==0.4.0
+pluggy==0.5.2
 py==1.4.34
 python-crfsuite==0.9.2
 pytz==2017.2
diff --git a/tests/requirements_dev.txt b/tests/requirements_dev.txt
index 7629dabd..bc7a2e05 100644
--- a/tests/requirements_dev.txt
+++ b/tests/requirements_dev.txt
@@ -7,7 +7,7 @@ future==0.16.0
 gunicorn==19.7.1
 nose==1.3.7
 numpy==1.13.1
-pluggy==0.4.0
+pluggy==0.5.2
 py==1.4.34
 python-crfsuite==0.9.2
 pytz==2017.2