diff --git a/README.md b/README.md
index 0faf8e8b1..a0b0161c7 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,8 @@
 
 A WireGuard®-based mesh network that connects your devices into a single private network.
 
+**Note**: The `main` branch may be in an *unstable or even broken state* during development. For stable versions, see [releases](https://github.com/wiretrustee/wiretrustee/releases).
+
 ### Why using Wiretrustee?
 
 * Connect multiple devices to each other via a secure peer-to-peer Wireguard VPN tunnel. At home, the office, or anywhere else.
diff --git a/client/cmd/up_test.go b/client/cmd/up_test.go
index 811507b46..0151430b2 100644
--- a/client/cmd/up_test.go
+++ b/client/cmd/up_test.go
@@ -9,6 +9,7 @@ import (
 	"net/url"
 	"os"
 	"path/filepath"
+	"strings"
 	"testing"
 	"time"
 )
@@ -70,7 +71,7 @@ func TestUp(t *testing.T) {
 		"--config",
 		confPath,
 		"--setup-key",
-		"a2c8e62b-38f5-4553-b31e-dd66c696cebb",
+		strings.ToUpper("a2c8e62b-38f5-4553-b31e-dd66c696cebb"),
 		"--management-url",
 		mgmtURL.String(),
 	})