diff --git a/pyproject.toml b/pyproject.toml
index d25c8fb..5747932 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -12,7 +12,7 @@ build-backend = "setuptools.build_meta"
 
 [tool.setuptools_scm]
 version_scheme= "post-release"
-tag_regex="^(?:v)?(?P<version>\d+\.\d+\.\d+)([\.\-\+])?(?:.*)?"
+tag_regex="^(?:v)?(?P<version>\\d+\\.\\d+\\.\\d+)([\\.\\-\\+])?(?:.*)?"
 
 [project]
 name = "pygitversionhelper"