diff --git a/advanced/firmware/.cargo/config b/advanced/firmware/.cargo/config.toml
similarity index 100%
rename from advanced/firmware/.cargo/config
rename to advanced/firmware/.cargo/config.toml
diff --git a/beginner/apps/.cargo/config b/beginner/apps/.cargo/config.toml
similarity index 100%
rename from beginner/apps/.cargo/config
rename to beginner/apps/.cargo/config.toml