diff --git a/go.mod b/go.mod
index 37a1590..5d18e8e 100644
--- a/go.mod
+++ b/go.mod
@@ -9,7 +9,6 @@ require (
 	github.com/streamingfast/logging v0.0.0-20220304214715-bc750a74b424
 	github.com/streamingfast/sf-tracing v0.0.0-20240209202324-9daa52c71a52
 	github.com/stretchr/testify v1.11.1
-	github.com/test-go/testify v1.1.4
 	go.uber.org/zap v1.21.0
 	google.golang.org/grpc v1.77.0
 	google.golang.org/protobuf v1.36.10
diff --git a/middleware/connect/authentication_test.go b/middleware/connect/authentication_test.go
index 10bb444..0d611b2 100644
--- a/middleware/connect/authentication_test.go
+++ b/middleware/connect/authentication_test.go
@@ -3,11 +3,12 @@ package server
 import (
 	"context"
 	"net/http"
+	"strings"
 	"testing"
 
 	"github.com/streamingfast/dauth"
+	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
-	"github.com/test-go/testify/assert"
 )
 
 type testAuthenticators struct {
@@ -22,7 +23,9 @@ func (t testAuthenticators) Ready(_ context.Context) bool {
 func (t testAuthenticators) Authenticate(ctx context.Context, path string, headers map[string][]string, ipAddress string) (context.Context, error) {
 	out := make(dauth.TrustedHeaders)
 	for key, values := range headers {
-		out[key] = values[0]
+		// Lower-case like real authenticators do, otherwise "X-SUBSTREAMS-Ll" and "x-substreams-ll"
+		// collide in [dauth.WithTrustedHeaders] and the winner depends on map iteration order.
+		out[strings.ToLower(key)] = values[0]
 	}
 	out["x-substreams-ll"] = "987"
 	out["x-user-id"] = "a1b2c3"