diff --git a/handler.go b/handler.go
index 5edffef..b61957e 100644
--- a/handler.go
+++ b/handler.go
@@ -15,6 +15,7 @@ import (
 const (
 	encodingGzip   = "gzip"
 	encodingBrotli = "br"
+	encodingZstd   = "zstd"
 )
 
 // New returns a new handler. Standard security headers are set.
@@ -148,11 +149,15 @@ func (h *Handler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 
 	// select compression
 	data := info.Uncompressed
-	gzip, brotli := acceptedEncodings(req)
-	if brotli && info.Brotli != nil {
+	gzip, brotli, zstd := acceptedEncodings(req)
+	switch {
+	case zstd && info.Zstd != nil:
+		data = info.Zstd
+		w.Header().Set("Content-Encoding", encodingZstd)
+	case brotli && info.Brotli != nil:
 		data = info.Brotli
 		w.Header().Set("Content-Encoding", encodingBrotli)
-	} else if gzip && info.Gzip != nil {
+	case gzip && info.Gzip != nil:
 		data = info.Gzip
 		w.Header().Set("Content-Encoding", encodingGzip)
 	}
@@ -182,7 +187,7 @@ func (h *Handler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 	w.Write(h.mapped[offset : offset+length])
 }
 
-func acceptedEncodings(req *http.Request) (gzip, brotli bool) {
+func acceptedEncodings(req *http.Request) (gzip, brotli, zstd bool) {
 	encodings := req.Header.Get("Accept-Encoding")
 	for _, enc := range strings.Split(encodings, ",") {
 		switch strings.TrimSpace(enc) {