diff --git a/system/upgrade_debian_10_to_11.sh b/system/upgrade_debian_10_to_11.sh
index fcdd4f1..49c8cf2 100644
--- a/system/upgrade_debian_10_to_11.sh
+++ b/system/upgrade_debian_10_to_11.sh
@@ -31,6 +31,12 @@ sed -i 's/buster-security/bullseye-security/g' /etc/apt/sources.list
 find /etc/apt/sources.list.d/ -type f -name "*.list" -exec sed -i 's/buster/bullseye/g' {} +
 find /etc/apt/sources.list.d/ -type f -name "*.list" -exec sed -i 's/buster-security/bullseye-security/g' {} +
 
+# Check and replace specific security entry in sources.list
+if grep -q "deb http://security.debian.org bullseye/updates main contrib" /etc/apt/sources.list; then
+    sed -i 's|deb http://security.debian.org bullseye/updates main contrib|deb http://security.debian.org/debian-security bullseye-security main contrib non-free|' /etc/apt/sources.list
+    echo -e "${YELLOW}Updated security repository entry in sources.list.${NC}"
+fi
+
 # Update APT cache and perform upgrade
 echo -e "${BLUE}Updating package lists...${NC}"
 apt update