diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 059b947..dde5cd9 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -53,3 +53,6 @@ jobs:
         uses: softprops/action-gh-release@c95fe1489396fe8a9eb87c0abf8aa5b2ef267fda # v2
         with:
           files: ./artifacts/*
+          # SemVer pre-release tags carry a hyphen (v1.0.0-rc.1); flag those so the GitHub
+          # Release matches how NuGet already treats them. Stable tags (v1.0.0) stay full releases.
+          prerelease: ${{ contains(github.ref_name, '-') }}