diff --git a/pyproject.toml b/pyproject.toml
index d8b6883..18cb71a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -88,7 +88,7 @@ ignore = [
 version_toml = ["pyproject.toml:project.version"]
 branch = "main"
 version_source = "tag"
-version_pattern = "v(?P<major>\d+)\.(?P<minor>\d+)\.(?P<patch>\d+)"
+version_pattern = "v(?P<major>\\d+)\\.(?P<minor>\\d+)\\.(?P<patch>\\d+)"
 major_on_zero = false
 build_command = "python -m pip install --upgrade build && python -m build"
 dist_path = "dist/"