diff --git a/.github/workflows/posix.yml b/.github/workflows/posix.yml
index 1d8593d..aca4445 100644
--- a/.github/workflows/posix.yml
+++ b/.github/workflows/posix.yml
@@ -113,7 +113,7 @@ jobs:
         if [[ "$NIGHTLY" = "true" ]]; then
           # Set the pyproject.toml version: convert v0.3.24-30-g138ed79f to 0.3.34.30
           version=$(cd OpenBLAS && git describe --tags --abbrev=8 | sed -e "s/^v\(.*\)-g.*/\1/" | sed -e "s/-/./g")
-          sed -e "s/^version = .*/version = ${version}/" -i.bak pyproject.toml
+          sed -e "s/^version = .*/version = \"${version}\"/" -i.bak pyproject.toml
         fi
         if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then
           source tools/build_wheel.sh