diff --git a/requirements_dev.txt b/requirements_dev.txt
index d0b8c22f..a19c9f2a 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -6,7 +6,7 @@ executor >= 21.0
 click >=7.0,<8.0
 
 # Unit tests.
-pytest ==5.4.2
+pytest ==5.4.3
 pytest-cov == 2.10.0
 pypng == 0.0.20