--- a/rust/CMakeLists.txt
+++ b/rust/CMakeLists.txt
@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: BSD-2-Clause
 # SPDX-FileCopyrightText: 2025 Arjen Hiemstra <ahiemstra@heimr.nl>
 
-corrosion_import_crate(MANIFEST_PATH Cargo.toml)
+corrosion_import_crate(MANIFEST_PATH Cargo.toml LOCKED FROZEN)
 corrosion_set_env_vars(cxx_rust_cssparser_impl CARGO_TARGET_DIR=${CMAKE_CURRENT_BINARY_DIR}/output)
 
 set_source_files_properties(