diff --git a/go.mod b/go.mod
index e618de5..a911d14 100644
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,7 @@ module github.com/basecamp/thruster
 go 1.26
 
 require (
-	github.com/klauspost/compress v1.18.2
+	github.com/klauspost/compress v1.18.4
 	github.com/stretchr/testify v1.8.4
 	golang.org/x/crypto v0.46.0
 	golang.org/x/net v0.48.0
diff --git a/go.sum b/go.sum
index af9bfa8..53822fa 100644
--- a/go.sum
+++ b/go.sum
@@ -3,6 +3,8 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/klauspost/compress v1.18.2 h1:iiPHWW0YrcFgpBYhsA6D1+fqHssJscY/Tm/y2Uqnapk=
 github.com/klauspost/compress v1.18.2/go.mod h1:R0h/fSBs8DE4ENlcrlib3PsXS61voFxhIs2DeRhCvJ4=
+github.com/klauspost/compress v1.18.4 h1:RPhnKRAQ4Fh8zU2FY/6ZFDwTVTxgJ/EMydqSTzE9a2c=
+github.com/klauspost/compress v1.18.4/go.mod h1:R0h/fSBs8DE4ENlcrlib3PsXS61voFxhIs2DeRhCvJ4=
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
diff --git a/internal/compression_handler_test.go b/internal/compression_handler_test.go
index 4717897..b7b3730 100644
--- a/internal/compression_handler_test.go
+++ b/internal/compression_handler_test.go
@@ -8,6 +8,7 @@ import (
 	"strings"
 	"testing"
 
+	"github.com/klauspost/compress/zstd"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
@@ -21,7 +22,7 @@ func TestCompressionHandler(t *testing.T) {
 		require.NoError(t, err)
 	})
 
-	t.Run("compresses responses", func(t *testing.T) {
+	t.Run("compresses responses with gzip", func(t *testing.T) {
 		handler := NewCompressionHandler(0, false, upstream)
 
 		req := httptest.NewRequest("GET", "/", nil)
@@ -40,6 +41,37 @@ func TestCompressionHandler(t *testing.T) {
 		assert.Equal(t, largeBody, string(body))
 	})
 
+	t.Run("compresses responses with zstd", func(t *testing.T) {
+		handler := NewCompressionHandler(0, false, upstream)
+
+		req := httptest.NewRequest("GET", "/", nil)
+		req.Header.Set("Accept-Encoding", "zstd")
+		rr := httptest.NewRecorder()
+
+		handler.ServeHTTP(rr, req)
+
+		assert.Equal(t, "zstd", rr.Header().Get("Content-Encoding"))
+
+		reader, err := zstd.NewReader(rr.Body)
+		require.NoError(t, err)
+		defer reader.Close()
+		body, err := io.ReadAll(reader)
+		require.NoError(t, err)
+		assert.Equal(t, largeBody, string(body))
+	})
+
+	t.Run("prefers zstd when client accepts both", func(t *testing.T) {
+		handler := NewCompressionHandler(0, false, upstream)
+
+		req := httptest.NewRequest("GET", "/", nil)
+		req.Header.Set("Accept-Encoding", "gzip, zstd")
+		rr := httptest.NewRecorder()
+
+		handler.ServeHTTP(rr, req)
+
+		assert.Equal(t, "zstd", rr.Header().Get("Content-Encoding"))
+	})
+
 	t.Run("applies jitter when configured", func(t *testing.T) {
 		handler := NewCompressionHandler(32, false, upstream)