diff --git a/OTHERS/PDF_Downloader/requirements.txt b/OTHERS/PDF_Downloader/requirements.txt
index 9ab26d27..08126d59 100644
--- a/OTHERS/PDF_Downloader/requirements.txt
+++ b/OTHERS/PDF_Downloader/requirements.txt
@@ -1,4 +1,4 @@
 beautifulsoup4==4.10.0
 requests==2.32.2
 idna>=3.7 # not directly required, pinned by Snyk to avoid a vulnerability
-urllib3>=1.26.19 # not directly required, pinned by Snyk to avoid a vulnerability
+urllib3>=2.6.3 # not directly required, pinned by Snyk to avoid a vulnerability