diff --git a/cmd/cli/cli.go b/cmd/cli/cli.go
index e87f12a..2f52829 100644
--- a/cmd/cli/cli.go
+++ b/cmd/cli/cli.go
@@ -3,9 +3,24 @@ package cli
 import (
 	"fmt"
 	"os"
+
+	log "github.com/sirupsen/logrus"
 )
 
 func Run() {
+	// These two lines are required to suppress log output from the Argo CD repo
+	// server, which Kargo Render uses as a library.
+	//
+	// Without suppressing this, requests for machine-readable output (e.g. JSON)
+	// will be polluted with log output and attempts to parse it (e.g. by Kargo)
+	// will fail.
+	//
+	// This does NOT interfere with using the Kargo Render CLI's own --debug flag,
+	// however, choosing that will, once again, result in some amount of
+	// unparsable output.
+	os.Setenv("ARGOCD_LOG_LEVEL", "PANIC")
+	log.SetLevel(log.PanicLevel)
+
 	cmd, err := newRootCommand()
 	if err != nil {
 		fmt.Println(err)