diff --git a/.ci_support/linux_64_.yaml b/.ci_support/linux_64_.yaml
index 6c59082..3166d1d 100644
--- a/.ci_support/linux_64_.yaml
+++ b/.ci_support/linux_64_.yaml
@@ -1,3 +1,7 @@
+c_stdlib:
+- sysroot
+c_stdlib_version:
+- '2.12'
 cdt_name:
 - cos6
 channel_sources:
@@ -6,3 +10,6 @@ channel_targets:
 - conda-forge main
 docker_image:
 - quay.io/condaforge/linux-anvil-cos7-x86_64
+zip_keys:
+- - c_stdlib_version
+  - cdt_name