diff --git a/matrix.yml b/matrix.yml
index 2e5285f2..0b80ef07 100644
--- a/matrix.yml
+++ b/matrix.yml
@@ -41,7 +41,7 @@ x-openmpi: &openmpi {name: "openmpi"}
 
 x-cccl-dev: &cccl_dev { name: "cccl-dev", hide: true }
 x-clangd-dev: &clangd_dev {name: "llvm", version: "dev", packages: "clangd", hide: true}
-x-clang-format-cccl: &clang_format_cccl {name: "llvm", version: "17", packages: "clang-format", hide: true}
+x-clang-format-cccl: &clang_format_cccl {name: "llvm", version: "18", packages: "clang-format", hide: true}
 x-clang-format-rapids: &clang_format_rapids {name: "llvm", version: "16", packages: "clang-format", hide: true}
 
 # CCCL only needs a subset of the full CTK: