diff --git a/cmd/root.go b/cmd/root.go
index d8f836a..6478541 100644
--- a/cmd/root.go
+++ b/cmd/root.go
@@ -27,6 +27,11 @@ var (
 		Use:   "roulette <path> [path]...",
 		Short: "Serves random images from the specified directories.",
 		Args:  cobra.MinimumNArgs(1),
+		PreRun: func(cmd *cobra.Command, args []string) {
+			if debug {
+				cmd.MarkFlagRequired("cache")
+			}
+		},
 		RunE: func(cmd *cobra.Command, args []string) error {
 			err := ServePage(args)
 			if err != nil {
diff --git a/cmd/version.go b/cmd/version.go
index 60240f3..1b125bc 100644
--- a/cmd/version.go
+++ b/cmd/version.go
@@ -10,7 +10,7 @@ import (
 	"github.com/spf13/cobra"
 )
 
-var Version = "0.43.0"
+var Version = "0.43.1"
 
 func init() {
 	rootCmd.AddCommand(versionCmd)