diff --git a/.ci_support/osx_64_.yaml b/.ci_support/osx_64_.yaml
index c8692e8..8a31235 100644
--- a/.ci_support/osx_64_.yaml
+++ b/.ci_support/osx_64_.yaml
@@ -1,7 +1,5 @@
 MACOSX_DEPLOYMENT_TARGET:
 - '10.13'
-MACOSX_SDK_VERSION:
-- '10.12'
 c_stdlib:
 - macosx_deployment_target
 c_stdlib_version: