diff --git a/.github/workflows/build-and-release.yml b/.github/workflows/build-and-release.yml
index b6b4bc8..ba77d96 100644
--- a/.github/workflows/build-and-release.yml
+++ b/.github/workflows/build-and-release.yml
@@ -21,3 +21,4 @@ jobs:
         uses: ncipollo/release-action@v1
         with:
           artifacts: "lecture-notes.pdf,chapters/*.pdf"
+          artifactContentType: application/pdf