diff --git a/dev-requirements.txt b/dev-requirements.txt
index cff50a9..2150bf3 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -22,7 +22,7 @@ pluggy==0.13.1; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2
 py==1.10.0; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
 pycodestyle==2.6.0; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
 pydocstyle==5.1.1
-pyflakes==2.2.0; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
+pyflakes==2.3.1; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
 pyparsing==2.4.7; python_version >= '2.6' and python_version not in '3.0, 3.1, 3.2'
 pytest-clarity==0.3.0a0
 pytest-cov==2.10.1