diff --git a/pkg/alert/config.go b/pkg/alert/config.go
index f509ccc993..8ad54dac89 100644
--- a/pkg/alert/config.go
+++ b/pkg/alert/config.go
@@ -67,7 +67,7 @@ func DefaultAlertmanagerConfig() AlertmanagerConfig {
 			FileSDConfigs:   []clientconfig.HTTPFileSDConfig{},
 		},
 		Timeout:    model.Duration(time.Second * 10),
-		APIVersion: APIv1,
+		APIVersion: APIv2,
 	}
 }
 
@@ -136,7 +136,7 @@ func BuildAlertmanagerConfig(address string, timeout time.Duration) (Alertmanage
 			StaticAddresses: []string{host},
 		},
 		Timeout:    model.Duration(timeout),
-		APIVersion: APIv1,
+		APIVersion: APIv2,
 	}, nil
 }
 
diff --git a/pkg/alert/config_test.go b/pkg/alert/config_test.go
index a0e259756c..5df9b88f06 100644
--- a/pkg/alert/config_test.go
+++ b/pkg/alert/config_test.go
@@ -58,7 +58,7 @@ func TestBuildAlertmanagerConfiguration(t *testing.T) {
 					StaticAddresses: []string{"localhost:9093"},
 					Scheme:          "http",
 				},
-				APIVersion: APIv1,
+				APIVersion: APIv2,
 			},
 		},
 		{
@@ -68,7 +68,7 @@ func TestBuildAlertmanagerConfiguration(t *testing.T) {
 					StaticAddresses: []string{"am.example.com"},
 					Scheme:          "https",
 				},
-				APIVersion: APIv1,
+				APIVersion: APIv2,
 			},
 		},
 		{
@@ -78,7 +78,7 @@ func TestBuildAlertmanagerConfiguration(t *testing.T) {
 					StaticAddresses: []string{"dns+localhost:9093"},
 					Scheme:          "http",
 				},
-				APIVersion: APIv1,
+				APIVersion: APIv2,
 			},
 		},
 		{
@@ -88,7 +88,7 @@ func TestBuildAlertmanagerConfiguration(t *testing.T) {
 					StaticAddresses: []string{"dnssrv+localhost"},
 					Scheme:          "http",
 				},
-				APIVersion: APIv1,
+				APIVersion: APIv2,
 			},
 		},
 		{
@@ -98,7 +98,7 @@ func TestBuildAlertmanagerConfiguration(t *testing.T) {
 					StaticAddresses: []string{"localhost"},
 					Scheme:          "ssh+http",
 				},
-				APIVersion: APIv1,
+				APIVersion: APIv2,
 			},
 		},
 		{
@@ -109,7 +109,7 @@ func TestBuildAlertmanagerConfiguration(t *testing.T) {
 					Scheme:          "https",
 					PathPrefix:      "/path/prefix/",
 				},
-				APIVersion: APIv1,
+				APIVersion: APIv2,
 			},
 		},
 		{
@@ -125,7 +125,7 @@ func TestBuildAlertmanagerConfiguration(t *testing.T) {
 					StaticAddresses: []string{"localhost:9093"},
 					Scheme:          "http",
 				},
-				APIVersion: APIv1,
+				APIVersion: APIv2,
 			},
 		},
 		{