diff --git a/.buildkite/code.pipeline.yml b/.buildkite/code.pipeline.yml
index a1f600d9c16..71801fff7da 100644
--- a/.buildkite/code.pipeline.yml
+++ b/.buildkite/code.pipeline.yml
@@ -307,11 +307,10 @@ steps:
       <<: *docker_plugin_sgx
 
   ####################################
-  # Rust coverage job (only on master)
+  # Rust coverage job.
   ####################################
 
   - label: Coverage Rust crates
-    branches: master stable/*
     command:
       # Build storage interoperability test helpers first.
       - make build-helpers
diff --git a/.buildkite/rust/coverage.sh b/.buildkite/rust/coverage.sh
index 84143959a4f..ca3fa32de96 100755
--- a/.buildkite/rust/coverage.sh
+++ b/.buildkite/rust/coverage.sh
@@ -45,13 +45,16 @@ git checkout -B ${BUILDKITE_BRANCH}
 # Calculate coverage.
 set +x
 cargo tarpaulin \
+  --locked \
   --ignore-tests \
   --out Xml \
   --all \
+  --avoid-cfg-tarpaulin \
   --exclude simple-keyvalue \
   --exclude-files '*generated*' \
   --exclude-files tests \
   --exclude-files runtime/src/storage/mkvs/interop \
+  --exclude-files tools \
   --coveralls ${coveralls_api_token} \
   -v
 set -x
diff --git a/.changelog/4197.internal.md b/.changelog/4197.internal.md
new file mode 100644
index 00000000000..0bae6bb1725
--- /dev/null
+++ b/.changelog/4197.internal.md
@@ -0,0 +1 @@
+rust/ci: bump tarpaulin to 0.18.0
diff --git a/docker/testing/Dockerfile b/docker/testing/Dockerfile
index da8b37d7998..b78cc7bb848 100644
--- a/docker/testing/Dockerfile
+++ b/docker/testing/Dockerfile
@@ -13,4 +13,4 @@ RUN wget -O codecov https://codecov.io/bash && \
 
 # Install tarpaulin.
 RUN RUSTFLAGS="--cfg procmacro2_semver_exempt" \
-    cargo install --version 0.16.0 cargo-tarpaulin
+    cargo install --version 0.18.0 cargo-tarpaulin