diff --git a/config/mongodb.go b/config/mongodb.go
index 2409d40e..6fc0ad71 100644
--- a/config/mongodb.go
+++ b/config/mongodb.go
@@ -35,11 +35,6 @@ type MongoDB struct {
 	// DisableFullDocumentBeforeChange - This is relevant if you're connecting to Document DB.
 	// BSON field '$changeStream.fullDocumentBeforeChange' is an unknown field.
 	DisableFullDocumentBeforeChange bool `yaml:"disableFullDocumentBeforeChange,omitempty"`
-
-	// Deprecated - use [MongoDB.URI] instead.
-	Host     string `yaml:"host"`
-	Username string `yaml:"username,omitempty"`
-	Password string `yaml:"password,omitempty"`
 }
 
 type Collection struct {
@@ -62,8 +57,8 @@ func (m MongoDB) GetStreamingBatchSize() int32 {
 }
 
 func (m MongoDB) Validate() error {
-	if m.Host == "" && m.URI == "" {
-		return fmt.Errorf("either host or URI must be passed in")
+	if m.URI == "" {
+		return fmt.Errorf("URI is empty")
 	}
 
 	if m.Database == "" {
diff --git a/lib/mongo/config.go b/lib/mongo/config.go
index f955f070..42f2a57a 100644
--- a/lib/mongo/config.go
+++ b/lib/mongo/config.go
@@ -9,22 +9,12 @@ import (
 )
 
 func OptsFromConfig(cfg config.MongoDB) (*options.ClientOptions, error) {
-	opts := options.Client()
-
-	if cfg.URI != "" {
-		opts = opts.ApplyURI(cfg.URI)
-	} else if cfg.Host != "" {
-		opts = opts.ApplyURI(cfg.Host)
-		if cfg.Username != "" && cfg.Password != "" {
-			opts = opts.SetAuth(options.Credential{
-				Username: cfg.Username,
-				Password: cfg.Password,
-			})
-		}
-	} else {
-		return nil, fmt.Errorf("mongoDB requires a URI or host")
+	if cfg.URI == "" {
+		return nil, fmt.Errorf("mongoDB requires a URI")
 	}
 
+	opts := options.Client().ApplyURI(cfg.URI)
+
 	if !cfg.DisableTLS {
 		opts = opts.SetTLSConfig(&tls.Config{})
 	}
diff --git a/lib/mongo/config_test.go b/lib/mongo/config_test.go
index 4a9ed487..bd9d26ac 100644
--- a/lib/mongo/config_test.go
+++ b/lib/mongo/config_test.go
@@ -8,33 +8,10 @@ import (
 )
 
 func TestOptsFromConfig(t *testing.T) {
-	{
-		cfg := config.MongoDB{
-			Host:     "localhost",
-			Username: "user",
-			Password: "password",
-		}
-
-		opts, err := OptsFromConfig(cfg)
-		assert.NoError(t, err)
-		assert.NotNil(t, opts.TLSConfig)
-		assert.Equal(t, "user", opts.Auth.Username)
-		assert.Equal(t, "password", opts.Auth.Password)
-	}
-	{
-		// No username and password
-		cfg := config.MongoDB{
-			Host: "localhost",
-		}
-
-		opts, err := OptsFromConfig(cfg)
-		assert.NoError(t, err)
-		assert.Nil(t, opts.Auth)
-	}
 	{
 		// Disable TLS
 		cfg := config.MongoDB{
-			Host:       "localhost",
+			URI:        "mongodb://user:pass@localhost",
 			DisableTLS: true,
 		}