diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 6163c42b..8cb531a9 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -173,8 +173,6 @@ jobs:
             os_version: 15.4
           - toxenv: metadata
             os_version: 15.4
-          - toxenv: all
-            os_version: "15.6"
           - toxenv: all
             os_version: "16.0"
           - toxenv: base