diff --git a/README.md b/README.md
index 5e232c4..5d3a7e6 100644
--- a/README.md
+++ b/README.md
@@ -27,7 +27,6 @@ A package to send messages to Microsoft Teams (channels)
     - [How to create a webhook URL (Connector)](#how-to-create-a-webhook-url-connector)
   - [Examples](#examples)
     - [Basic](#basic)
-    - [Set custom user agent](#set-custom-user-agent)
     - [Add an Action](#add-an-action)
     - [Disable webhook URL prefix validation](#disable-webhook-url-prefix-validation)
     - [Enable custom patterns' validation](#enable-custom-patterns-validation)
@@ -70,8 +69,6 @@ information.
     validation behavior
 - Configurable timeouts
 - Configurable retry support
-- Support for overriding the default `http.Client`
-- Support for overriding default project-specific user agent
 
 ## Project Status
 
@@ -187,12 +184,6 @@ This is an example of a simple client application which uses this library.
 
 File: [basic](./examples/basic/main.go)
 
-#### Set custom user agent
-
-This example illustrates setting a custom user agent.
-
-File: [custom-user-agent](./examples/custom-user-agent/main.go)
-
 #### Add an Action
 
 This example illustrates adding an [`OpenUri Action`][msgcard-ref-actions] to
diff --git a/doc.go b/doc.go
index 5492584..c96a8e0 100644
--- a/doc.go
+++ b/doc.go
@@ -33,10 +33,6 @@ FEATURES
 
 • Configurable retry support
 
-• Support for overriding the default http.Client
-
-• Support for overriding the default project-specific user agent
-
 
 USAGE
 
diff --git a/examples/custom-user-agent/main.go b/examples/custom-user-agent/main.go
deleted file mode 100644
index aa936f3..0000000
--- a/examples/custom-user-agent/main.go
+++ /dev/null
@@ -1,52 +0,0 @@
-// Copyright 2021 Adam Chalkley
-//
-// https://github.com/atc0005/go-teams-notify
-//
-// Licensed under the MIT License. See LICENSE file in the project root for
-// full license information.
-
-/*
-
-This is an example of a simple client application which uses this library.
-
-Of note:
-
-- default timeout
-- custom user agent
-- package-level logging is disabled by default
-- validation of known webhook URL prefixes is *enabled*
-- simple message submitted to Microsoft Teams consisting of formatted body and
-  title
-
-*/
-
-package main
-
-import (
-	goteamsnotify "github.com/atc0005/go-teams-notify/v2"
-)
-
-func main() {
-	_ = sendTheMessage()
-}
-
-func sendTheMessage() error {
-	// init the client
-	mstClient := goteamsnotify.NewClient()
-
-	// override the project-specific default user agent
-	mstClient.SetUserAgent("go-teams-notify-example/1.0")
-
-	// setup webhook url
-	webhookUrl := "https://outlook.office.com/webhook/YOUR_WEBHOOK_URL_OF_TEAMS_CHANNEL"
-
-	// setup message card
-	msgCard := goteamsnotify.NewMessageCard()
-	msgCard.Title = "Hello world"
-	msgCard.Text = "Here are some examples of formatted stuff like " +
-		"<br> * this list itself  <br> * **bold** <br> * *italic* <br> * ***bolditalic***"
-	msgCard.ThemeColor = "#DF813D"
-
-	// send
-	return mstClient.Send(webhookUrl, msgCard)
-}
diff --git a/send.go b/send.go
index 38a6190..3c3468f 100644
--- a/send.go
+++ b/send.go
@@ -69,14 +69,6 @@ const ExpectedWebhookURLResponseText string = "1"
 // before it times out and is cancelled.
 const DefaultWebhookSendTimeout = 5 * time.Second
 
-// DefaultUserAgent is the project-specific user agent used when submitting
-// messages unless overridden by client code. This replaces the Go default
-// user agent value of "Go-http-client/1.1".
-//
-// The major.minor numbers reflect when this project first diverged from the
-// "upstream" or parent project.
-const DefaultUserAgent string = "go-teams-notify/2.2"
-
 // ErrWebhookURLUnexpected is returned when a provided webhook URL does
 // not match a set of confirmed webhook URL patterns.
 var ErrWebhookURLUnexpected = errors.New("webhook URL does not match one of expected patterns")
@@ -97,8 +89,6 @@ type API interface {
 	Send(webhookURL string, webhookMessage MessageCard) error
 	SendWithContext(ctx context.Context, webhookURL string, webhookMessage MessageCard) error
 	SendWithRetry(ctx context.Context, webhookURL string, webhookMessage MessageCard, retries int, retriesDelay int) error
-	SetHTTPClient(httpClient *http.Client) API
-	SetUserAgent(userAgent string) API
 	SkipWebhookURLValidationOnSend(skip bool) API
 	AddWebhookURLValidationPatterns(patterns ...string) API
 	ValidateWebhook(webhookURL string) error
@@ -106,7 +96,6 @@ type API interface {
 
 type teamsClient struct {
 	httpClient                   *http.Client
-	userAgent                    string
 	webhookURLValidationPatterns []string
 	skipWebhookURLValidation     bool
 }
@@ -144,24 +133,6 @@ func NewClient() API {
 	return &client
 }
 
-// SetHTTPClient accepts a custom http.Client value which replaces the
-// existing default http.Client.
-func (c *teamsClient) SetHTTPClient(httpClient *http.Client) API {
-	c.httpClient = httpClient
-
-	return c
-}
-
-// SetUserAgent accepts a custom user agent string. This custom user agent is
-// used when submitting messages to Microsoft Teams.
-func (c *teamsClient) SetUserAgent(userAgent string) API {
-	c.userAgent = userAgent
-
-	return c
-}
-
-// AddWebhookURLValidationPatterns collects given patterns for validation of
-// the webhook URL.
 func (c *teamsClient) AddWebhookURLValidationPatterns(patterns ...string) API {
 	c.webhookURLValidationPatterns = append(c.webhookURLValidationPatterns, patterns...)
 	return c
@@ -340,14 +311,6 @@ func (c teamsClient) prepareRequest(ctx context.Context, webhookURL string, prep
 
 	req.Header.Add("Content-Type", "application/json;charset=utf-8")
 
-	// If provided, override the project-specific user agent with custom value.
-	switch {
-	case c.userAgent != "":
-		req.Header.Set("User-Agent", c.userAgent)
-	default:
-		req.Header.Set("User-Agent", DefaultUserAgent)
-	}
-
 	return req, nil
 }