diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index f52855be..14267001 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -30,6 +30,11 @@ jobs:
           TAG=$(git describe --tags)
           if [ "${{ github.ref }}" = "refs/heads/$TAG" ]; then
             echo "is_release=true" >> $GITHUB_OUTPUT
+            if [[ $TAG =~ ^v[0-9]+\.[0-9]+\.[0-9]$ ]]; then
+              echo "is_prerelease=false" >> $GITHUB_OUTPUT
+            else
+              echo "is_prerelease=true" >> $GITHUB_OUTPUT
+            fi
           else
             echo "is_release=false" >> $GITHUB_OUTPUT
           fi