diff --git a/theme.toml b/theme.toml
index 3ebbff6..9e56685 100644
--- a/theme.toml
+++ b/theme.toml
@@ -5,7 +5,7 @@ description = "Starter Hugo theme for developers."
 homepage = "https://github.com/vimux/blank/"
 tags = ["blog", "plain", "blank", "starter", "development"]
 features = ["blog"]
-min_version = 0.20
+min_version = "0.20"
 
 [author]
   name = "Vimux"