diff --git a/lib/datasource/pypi.js b/lib/datasource/pypi.js
index 5d2fc98524b85b33b67d542bc571fcca626dca43..1da959da2d6997a264fd45f5b047a36cd6a578cc 100644
--- a/lib/datasource/pypi.js
+++ b/lib/datasource/pypi.js
@@ -8,7 +8,7 @@ module.exports = {
 };
 
 function normalizeName(input) {
-  return input.toLowerCase().replace('-', '_');
+  return input.toLowerCase().replace(/-/g, '_');
 }
 
 async function getDependency(purl, config = {}) {