diff --git a/main.go b/main.go
index e844224..b4acadb 100644
--- a/main.go
+++ b/main.go
@@ -10,10 +10,10 @@ import (
 	"net/http"
 )
 
-type telemetry struct {
-	slug            string `json:"slug"`
-	eventType       string `json:"type"`
-	qualityChangeUp bool   `json:"isUp"`
+type Telemetry struct {
+	Slug            string `json:"slug"`
+	EventType       string `json:"type"`
+	QualityChangeUp bool   `json:"isUp"`
 }
 
 type metrics struct {
@@ -24,9 +24,9 @@ type metrics struct {
 }
 
 const (
-	type_buffering      = "buffering"
-	type_recovery       = "recovery"
-	type_quality_switch = "quality_switch"
+	typeBuffering     = "buffering"
+	typeRecovery      = "recovery"
+	typeQualitySwitch = "quality_switch"
 )
 
 func main() {
@@ -60,22 +60,22 @@ func main() {
 
 func telemetryHandler(m metrics) echo.HandlerFunc {
 	return func(c echo.Context) error {
-		t := new([]telemetry)
+		t := new([]Telemetry)
 		if err := c.Bind(t); err != nil {
 			return c.String(http.StatusBadRequest, "bad request")
 		}
 
 		for _, v := range *t {
-			switch v.eventType {
-			case type_buffering:
-				m.buffering.WithLabelValues(v.slug).Inc()
-			case type_recovery:
-				m.recovery.WithLabelValues(v.slug).Inc()
-			case type_quality_switch:
-				if v.qualityChangeUp {
-					m.qualityUp.WithLabelValues(v.slug).Inc()
+			switch v.EventType {
+			case typeBuffering:
+				m.buffering.WithLabelValues(v.Slug).Inc()
+			case typeRecovery:
+				m.recovery.WithLabelValues(v.Slug).Inc()
+			case typeQualitySwitch:
+				if v.QualityChangeUp {
+					m.qualityUp.WithLabelValues(v.Slug).Inc()
 				} else {
-					m.qualityDown.WithLabelValues(v.slug).Inc()
+					m.qualityDown.WithLabelValues(v.Slug).Inc()
 				}
 			}
 		}
diff --git a/package.nix b/package.nix
index e3bf5d9..5540945 100644
--- a/package.nix
+++ b/package.nix
@@ -5,7 +5,7 @@ let
     deps = [ ];
     nativeDeps = [ ];
 in
-pkgs.buildGo119Module {
+pkgs.buildGo121Module {
   pname = "voc-telemetry";
   inherit version;
   src = ./.;