Index: task-3.4.2/src/taskchampion-cpp/corrosion/cmake/Corrosion.cmake
===================================================================
--- task-3.4.2.orig/src/taskchampion-cpp/corrosion/cmake/Corrosion.cmake
+++ task-3.4.2/src/taskchampion-cpp/corrosion/cmake/Corrosion.cmake
@@ -1728,7 +1728,6 @@ function(corrosion_add_cxxbridge cxx_tar
     set(ONE_VALUE_KEYWORDS CRATE REGEN_TARGET)
     set(MULTI_VALUE_KEYWORDS FILES)
     cmake_parse_arguments(PARSE_ARGV 1 _arg "${OPTIONS}" "${ONE_VALUE_KEYWORDS}" "${MULTI_VALUE_KEYWORDS}")
-
     set(required_keywords CRATE FILES)
     foreach(keyword ${required_keywords})
         if(NOT DEFINED "_arg_${keyword}")
@@ -1803,6 +1802,7 @@ function(corrosion_add_cxxbridge cxx_tar
                     cxxbridge-cmd
                     --version "${cxx_required_version}"
                     --locked
+                    --offline
                     --root "${CMAKE_BINARY_DIR}/corrosion/cxxbridge_v${cxx_required_version}"
                     --quiet
                     # todo: use --target-dir to potentially reuse artifacts
Index: task-3.4.2/src/taskchampion-cpp/CMakeLists.txt
===================================================================
--- task-3.4.2.orig/src/taskchampion-cpp/CMakeLists.txt
+++ task-3.4.2/src/taskchampion-cpp/CMakeLists.txt
@@ -61,11 +61,13 @@ endif (ENABLE_TLS_NATIVE_ROOTS)
 corrosion_import_crate(
   MANIFEST_PATH "${CMAKE_SOURCE_DIR}/Cargo.toml"
   LOCKED
+  FROZEN
   CRATES "taskchampion-lib"
   FEATURES "${TASKCHAMPION_FEATURES}")
 
 # Set up `taskchampion-cpp`, the C++ side of the bridge.
 corrosion_add_cxxbridge(taskchampion-cpp
   CRATE taskchampion_lib
+  FROZEN
   FILES lib.rs
 )