diff --git a/pyproject.toml b/pyproject.toml
index be602a193..f29f91fbb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -25,8 +25,7 @@ dependencies = [
     "configobj>=5.0.6",
     "voluptuous>=0.11.7",
     "requests>=2.22.0",
-    # See https://github.com/bdcht/grandalf/issues/26
-    "grandalf==0.6",
+    "grandalf>=0.6,<1",
     "distro>=1.3.0",
     "appdirs>=1.4.3",
     "ruamel.yaml>=0.17.11",