diff --git a/README.md b/README.md
index e20c1f7..a713468 100644
--- a/README.md
+++ b/README.md
@@ -58,13 +58,13 @@ $ xcaddy build \
     --with github.com/caddyserver/ntlm-transport
 
 $ xcaddy build v2.0.1 \
-    --with github.com/caddyserver/ntlm-transport@v0.1.0
+    --with github.com/caddyserver/ntlm-transport@v0.1.1
 
 $ xcaddy build \
     --with github.com/caddyserver/ntlm-transport=../../my-fork
 
 $ xcaddy build \
-    --with github.com/caddyserver/ntlm-transport@v0.1.0=../../my-fork
+    --with github.com/caddyserver/ntlm-transport@v0.1.1=../../my-fork
 ```
 
 ### For plugin development
@@ -90,18 +90,18 @@ $ xcaddy run
 $ xcaddy run --config caddy.json
 ```
 
-
+The race detector can be enabled by setting `CADDY_RACE_DETECTOR=1`.
 
 
 ## Library usage
 
 ```go
 builder := xcaddy.Builder{
-	CaddyVersion: "v2.0.0-rc.1",
+	CaddyVersion: "v2.0.0",
 	Plugins: []xcaddy.Dependency{
 		{
 			ModulePath: "github.com/caddyserver/ntlm-transport",
-			Version:    "v0.1.0",
+			Version:    "v0.1.1",
 		},
 	},
 }
diff --git a/builder.go b/builder.go
index e8f3247..ed21912 100644
--- a/builder.go
+++ b/builder.go
@@ -40,6 +40,7 @@ type Builder struct {
 	Replacements []Replace     `json:"replacements,omitempty"`
 	TimeoutGet   time.Duration `json:"timeout_get,omitempty"`
 	TimeoutBuild time.Duration `json:"timeout_build,omitempty"`
+	RaceDetector bool          `json:"race_detector,omitempty"`
 }
 
 // Build builds Caddy at the configured version with the
@@ -92,6 +93,9 @@ func (b Builder) Build(ctx context.Context, outputFile string) error {
 		"-ldflags", "-w -s", // trim debug symbols
 		"-trimpath",
 	)
+	if b.RaceDetector {
+		cmd.Args = append(cmd.Args, "-race")
+	}
 	cmd.Env = env
 	err = buildEnv.runCommand(ctx, cmd, b.TimeoutBuild)
 	if err != nil {
diff --git a/cmd/xcaddy/main.go b/cmd/xcaddy/main.go
index c970d09..81ae3ed 100644
--- a/cmd/xcaddy/main.go
+++ b/cmd/xcaddy/main.go
@@ -28,7 +28,10 @@ import (
 	"github.com/caddyserver/xcaddy"
 )
 
-var caddyVersion = os.Getenv("CADDY_VERSION")
+var (
+	caddyVersion = os.Getenv("CADDY_VERSION")
+	raceDetector = os.Getenv("CADDY_RACE_DETECTOR") == "1"
+)
 
 func main() {
 	ctx, cancel := context.WithCancel(context.Background())
@@ -109,6 +112,7 @@ func runBuild(ctx context.Context, args []string) error {
 		CaddyVersion: caddyVersion,
 		Plugins:      plugins,
 		Replacements: replacements,
+		RaceDetector: raceDetector,
 	}
 	err := builder.Build(ctx, output)
 	if err != nil {
@@ -190,6 +194,7 @@ func runDev(ctx context.Context, args []string) error {
 			{ModulePath: currentModule},
 		},
 		Replacements: replacements,
+		RaceDetector: raceDetector,
 	}
 	err = builder.Build(ctx, binOutput)
 	if err != nil {