diff --git a/requirements.txt b/requirements.txt
index 0b47517..b3a9103 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -14,3 +14,4 @@ aiofiles
 sslpsk_pmd3
 hyperframe
 packaging
+urllib3>=2.5.0 # not directly required, pinned by Snyk to avoid a vulnerability