diff --git a/.github/workflows/nightly-tests.yaml b/.github/workflows/nightly-tests.yaml
index e3aaddd08b5..7c7f67c68c6 100644
--- a/.github/workflows/nightly-tests.yaml
+++ b/.github/workflows/nightly-tests.yaml
@@ -25,7 +25,6 @@ on:
           - v1.18.x
           - v1.17.x
           - v1.16.x
-          - v1.15.x
           - workflow_initiating_branch
       run-regression:
         description: "Run regression tests"