diff --git a/CHANGELOG.md b/CHANGELOG.md
index 67a80aee..73088559 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,9 @@ See updating [Changelog example here](https://keepachangelog.com/en/1.0.0/)
 
 ## [Unreleased]
 
+### Added
+- server: add `Index` field to `request.CreateServerInterface`
+
 ## [8.10.0]
 
 ### Added
diff --git a/upcloud/client/client_test.go b/upcloud/client/client_test.go
index 16a1906e..002da5a0 100644
--- a/upcloud/client/client_test.go
+++ b/upcloud/client/client_test.go
@@ -250,9 +250,9 @@ func TestClientWithLogger(t *testing.T) {
 	_, err := c.Get(context.TODO(), "/test")
 	require.NoError(t, err)
 
-	expected := `{"time":"2 Minutes to Midnight","level":"DEBUG","msg":"Sending request to UpCloud API","url":"http://server/1.3/test","method":"GET","headers":{"Accept":["application/json"],"Authorization":["Basic [REDACTED]"],"Content-Type":["application/json"],"User-Agent":["upcloud-go-api/8.9.0"]},"body":""}
+	expected := fmt.Sprintf(`{"time":"2 Minutes to Midnight","level":"DEBUG","msg":"Sending request to UpCloud API","url":"http://server/1.3/test","method":"GET","headers":{"Accept":["application/json"],"Authorization":["Basic [REDACTED]"],"Content-Type":["application/json"],"User-Agent":["upcloud-go-api/%s"]},"body":""}
 {"time":"2 Minutes to Midnight","level":"DEBUG","msg":"Received response from UpCloud API","url":"http://server/1.3/test","status":"200 OK","headers":{"Content-Length":["38"],"Content-Type":["text/plain; charset=utf-8"],"Date":["Fri, 11 Oct 2024 23:58:00 GMT"]},"body":"{\n  \"method\": \"GET\",\n  \"path\": \"/1.3/test\"\n}"}
-`
+`, Version)
 	assert.Equal(t, expected, output.String())
 }
 
diff --git a/upcloud/request/server.go b/upcloud/request/server.go
index af428e34..f1193056 100644
--- a/upcloud/request/server.go
+++ b/upcloud/request/server.go
@@ -104,6 +104,7 @@ func (s CreateServerStorageDeviceSlice) MarshalJSON() ([]byte, error) {
 // CreateServerInterface represents a server network interface
 // that is needed during server creation.
 type CreateServerInterface struct {
+	Index             int                        `json:"index,omitempty"`
 	IPAddresses       CreateServerIPAddressSlice `json:"ip_addresses"`
 	Type              string                     `json:"type"`
 	Network           string                     `json:"network,omitempty"`