diff --git a/requirements.txt b/requirements.txt
index d3e187e..a0abea8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,4 +3,5 @@ requests>=2.20.0
 pytest==2.9.2
 pytest-cov==2.12.1
 responses==0.8.1
-pytest-mock==1.2
\ No newline at end of file
+pytest-mock==1.2
+urllib3>=2.6.3 # not directly required, pinned by Snyk to avoid a vulnerability
\ No newline at end of file