diff --git a/src/Python/requirements.txt b/src/Python/requirements.txt
index b43a11e295..8a68a8b50a 100644
--- a/src/Python/requirements.txt
+++ b/src/Python/requirements.txt
@@ -5,7 +5,7 @@ nbconvert==7.0.0
 notebook==6.5.2
 numpy==1.22.0
 pytest==7.2.0
-pygments==2.12.0    # to avoid high-severity issue.
+pygments==2.15.0    # to avoid high-severity issue.
 pyzmq==25.0.0
 qutip==4.7.2
 selenium==4.2.0