diff --git a/.changelog/35821.txt b/.changelog/35821.txt
new file mode 100644
index 000000000000..1e60e960ce3b
--- /dev/null
+++ b/.changelog/35821.txt
@@ -0,0 +1,3 @@
+```release-note:bug
+resource/aws_apigatewayv2_route: Fix `BadRequestException: Unable to update route. Authorizer type is invalid or null` errors when updating `authorizer_id`
+```
diff --git a/internal/service/apigatewayv2/route.go b/internal/service/apigatewayv2/route.go
index 482aae51bda6..9b5803b26030 100644
--- a/internal/service/apigatewayv2/route.go
+++ b/internal/service/apigatewayv2/route.go
@@ -246,6 +246,7 @@ func resourceRouteUpdate(ctx context.Context, d *schema.ResourceData, meta inter
 		}
 		if d.HasChange("authorizer_id") {
 			req.AuthorizerId = aws.String(d.Get("authorizer_id").(string))
+			req.AuthorizationType = aws.String(d.Get("authorization_type").(string))
 		}
 		if d.HasChange("model_selection_expression") {
 			req.ModelSelectionExpression = aws.String(d.Get("model_selection_expression").(string))
diff --git a/internal/service/apigatewayv2/route_test.go b/internal/service/apigatewayv2/route_test.go
index 75550fb72378..e8bcd197e505 100644
--- a/internal/service/apigatewayv2/route_test.go
+++ b/internal/service/apigatewayv2/route_test.go
@@ -147,7 +147,6 @@ func TestAccAPIGatewayV2Route_jwtAuthorization(t *testing.T) {
 	var apiId string
 	var v apigatewayv2.GetRouteOutput
 	resourceName := "aws_apigatewayv2_route.test"
-	authorizerResourceName := "aws_apigatewayv2_authorizer.test"
 	rName := sdkacctest.RandomWithPrefix(acctest.ResourcePrefix)
 
 	resource.ParallelTest(t, resource.TestCase{
@@ -163,7 +162,7 @@ func TestAccAPIGatewayV2Route_jwtAuthorization(t *testing.T) {
 					resource.TestCheckResourceAttr(resourceName, "api_key_required", "false"),
 					resource.TestCheckResourceAttr(resourceName, "authorization_scopes.#", "2"),
 					resource.TestCheckResourceAttr(resourceName, "authorization_type", apigatewayv2.AuthorizationTypeJwt),
-					resource.TestCheckResourceAttrPair(resourceName, "authorizer_id", authorizerResourceName, "id"),
+					resource.TestCheckResourceAttrPair(resourceName, "authorizer_id", "aws_apigatewayv2_authorizer.test", "id"),
 					resource.TestCheckResourceAttr(resourceName, "model_selection_expression", ""),
 					resource.TestCheckResourceAttr(resourceName, "operation_name", ""),
 					resource.TestCheckResourceAttr(resourceName, "request_models.%", "0"),
@@ -186,7 +185,7 @@ func TestAccAPIGatewayV2Route_jwtAuthorization(t *testing.T) {
 					resource.TestCheckResourceAttr(resourceName, "api_key_required", "false"),
 					resource.TestCheckResourceAttr(resourceName, "authorization_scopes.#", "1"),
 					resource.TestCheckResourceAttr(resourceName, "authorization_type", apigatewayv2.AuthorizationTypeJwt),
-					resource.TestCheckResourceAttrPair(resourceName, "authorizer_id", authorizerResourceName, "id"),
+					resource.TestCheckResourceAttrPair(resourceName, "authorizer_id", "aws_apigatewayv2_authorizer.another", "id"),
 					resource.TestCheckResourceAttr(resourceName, "model_selection_expression", ""),
 					resource.TestCheckResourceAttr(resourceName, "operation_name", ""),
 					resource.TestCheckResourceAttr(resourceName, "request_models.%", "0"),
@@ -646,12 +645,24 @@ func testAccRouteConfig_jwtAuthorizationUpdated(rName string) string {
 	return acctest.ConfigCompose(
 		testAccAuthorizerConfig_jwt(rName),
 		`
+resource "aws_apigatewayv2_authorizer" "another" {
+  api_id           = aws_apigatewayv2_api.test.id
+  authorizer_type  = "JWT"
+  identity_sources = ["$request.header.Authorization"]
+  name             = "another-authorizer"
+
+  jwt_configuration {
+    audience = ["test"]
+    issuer   = "https://${aws_cognito_user_pool.test.endpoint}"
+  }
+}
+
 resource "aws_apigatewayv2_route" "test" {
   api_id    = aws_apigatewayv2_api.test.id
   route_key = "GET /test"
 
   authorization_type = "JWT"
-  authorizer_id      = aws_apigatewayv2_authorizer.test.id
+  authorizer_id      = aws_apigatewayv2_authorizer.another.id
 
   authorization_scopes = ["user.email"]
 }