diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index 689f872..e3cfa83 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -29,7 +29,7 @@ jobs:
       - name: Initialize dependencies (Ubuntu)
         run: |
             sudo apt-get update
-            sudo apt-get install libxpm-dev libupsclient-dev
+            sudo apt-get install libxpm-dev libxext-dev libupsclient-dev
 
       - name: Initialize dependencies (ensure NUT 2.8.0+)
         run: |