diff --git a/.github/workflows/code_coverage.yml b/.github/workflows/code_coverage.yml
index 8e1491adc..6dec3c086 100644
--- a/.github/workflows/code_coverage.yml
+++ b/.github/workflows/code_coverage.yml
@@ -36,7 +36,7 @@ jobs:
       - name: Run grcov
         run: grcov . --binary-path ./target/debug/ -s . -t lcov --branch --ignore-not-existing --keep-only '**/crates/**' --ignore '**/tests/**' --ignore '**/examples/**' -o ./coverage/lcov.info
       - name: Generate HTML coverage report
-        run: genhtml -o coverage-report.html --ignore-errors source ./coverage/lcov.info
+        run: genhtml -o coverage-report.html --ignore-errors unmapped ./coverage/lcov.info
       - name: Coveralls upload
         uses: coverallsapp/github-action@master
         with:
diff --git a/ci/pin-msrv.sh b/ci/pin-msrv.sh
index ac251945e..c2d7d3349 100755
--- a/ci/pin-msrv.sh
+++ b/ci/pin-msrv.sh
@@ -22,4 +22,5 @@ cargo update -p security-framework-sys --precise "2.11.1"
 cargo update -p csv --precise "1.3.0"
 cargo update -p unicode-width --precise "0.1.13"
 cargo update -p native-tls --precise "0.2.13"
-cargo update -p flate2 --precise "1.0.35"
\ No newline at end of file
+cargo update -p flate2 --precise "1.0.35"
+cargo update -p bzip2-sys --precise "0.1.12"