diff --git a/requirements_dev.txt b/requirements_dev.txt
index 0555353..7fac95c 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -42,7 +42,7 @@ sphinxcontrib-qthelp==1.0.2
 sphinxcontrib-serializinghtml==1.1.3
 tqdm==4.32.1
 twine==1.13.0
-urllib3==1.25.3
+urllib3==1.26.5
 wcwidth==0.1.7
 webencodings==0.5.1
 zipp==0.5.1