diff --git a/cmd/kubeadm/app/apis/kubeadm/v1beta2/conversion.go b/cmd/kubeadm/app/apis/kubeadm/v1beta2/conversion.go
index d5c2243b983..c51831b7c50 100644
--- a/cmd/kubeadm/app/apis/kubeadm/v1beta2/conversion.go
+++ b/cmd/kubeadm/app/apis/kubeadm/v1beta2/conversion.go
@@ -17,9 +17,12 @@ limitations under the License.
 package v1beta2
 
 import (
+	"unsafe"
+
 	corev1 "k8s.io/api/core/v1"
 	conversion "k8s.io/apimachinery/pkg/conversion"
 
+	bootstraptokenv1 "k8s.io/kubernetes/cmd/kubeadm/app/apis/bootstraptoken/v1"
 	kubeadm "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm"
 )
 
@@ -64,3 +67,19 @@ func Convert_v1beta2_JoinConfiguration_To_kubeadm_JoinConfiguration(in *JoinConf
 	out.NodeRegistration.ImagePullPolicy = corev1.PullIfNotPresent
 	return nil
 }
+
+// Convert_v1beta2_BootstrapToken_To_v1_BootstrapToken is required so that we can directly
+// cast a v1beta1.BootstrapToken to v1.BootstrapToken using unsafe.Pointer and not
+// field by field.
+func Convert_v1beta2_BootstrapToken_To_v1_BootstrapToken(in *BootstrapToken, out *bootstraptokenv1.BootstrapToken, s conversion.Scope) error {
+	*out = *(*bootstraptokenv1.BootstrapToken)(unsafe.Pointer(in))
+	return nil
+}
+
+// Convert_v1_BootstrapToken_To_v1beta2_BootstrapToken is required so that we can directly
+// cast a v1.BootstrapToken to v1beta1.BootstrapToken using unsafe.Pointer and not
+// field by field.
+func Convert_v1_BootstrapToken_To_v1beta2_BootstrapToken(in *bootstraptokenv1.BootstrapToken, out *BootstrapToken, s conversion.Scope) error {
+	*out = *(*BootstrapToken)(unsafe.Pointer(in))
+	return nil
+}
diff --git a/cmd/kubeadm/app/apis/kubeadm/v1beta2/zz_generated.conversion.go b/cmd/kubeadm/app/apis/kubeadm/v1beta2/zz_generated.conversion.go
index 798fdb32827..1b4d9ff0401 100644
--- a/cmd/kubeadm/app/apis/kubeadm/v1beta2/zz_generated.conversion.go
+++ b/cmd/kubeadm/app/apis/kubeadm/v1beta2/zz_generated.conversion.go
@@ -25,10 +25,10 @@ import (
 	unsafe "unsafe"
 
 	corev1 "k8s.io/api/core/v1"
-	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	conversion "k8s.io/apimachinery/pkg/conversion"
 	runtime "k8s.io/apimachinery/pkg/runtime"
-	bootstraptokenv1 "k8s.io/kubernetes/cmd/kubeadm/app/apis/bootstraptoken/v1"
+	v1 "k8s.io/kubernetes/cmd/kubeadm/app/apis/bootstraptoken/v1"
 	kubeadm "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm"
 )
 
@@ -204,6 +204,16 @@ func RegisterConversions(s *runtime.Scheme) error {
 	}); err != nil {
 		return err
 	}
+	if err := s.AddConversionFunc((*v1.BootstrapToken)(nil), (*BootstrapToken)(nil), func(a, b interface{}, scope conversion.Scope) error {
+		return Convert_v1_BootstrapToken_To_v1beta2_BootstrapToken(a.(*v1.BootstrapToken), b.(*BootstrapToken), scope)
+	}); err != nil {
+		return err
+	}
+	if err := s.AddConversionFunc((*BootstrapToken)(nil), (*v1.BootstrapToken)(nil), func(a, b interface{}, scope conversion.Scope) error {
+		return Convert_v1beta2_BootstrapToken_To_v1_BootstrapToken(a.(*BootstrapToken), b.(*v1.BootstrapToken), scope)
+	}); err != nil {
+		return err
+	}
 	if err := s.AddConversionFunc((*ClusterConfiguration)(nil), (*kubeadm.ClusterConfiguration)(nil), func(a, b interface{}, scope conversion.Scope) error {
 		return Convert_v1beta2_ClusterConfiguration_To_kubeadm_ClusterConfiguration(a.(*ClusterConfiguration), b.(*kubeadm.ClusterConfiguration), scope)
 	}); err != nil {
@@ -249,7 +259,7 @@ func autoConvert_v1beta2_APIServer_To_kubeadm_APIServer(in *APIServer, out *kube
 		return err
 	}
 	out.CertSANs = *(*[]string)(unsafe.Pointer(&in.CertSANs))
-	out.TimeoutForControlPlane = (*v1.Duration)(unsafe.Pointer(in.TimeoutForControlPlane))
+	out.TimeoutForControlPlane = (*metav1.Duration)(unsafe.Pointer(in.TimeoutForControlPlane))
 	return nil
 }
 
@@ -263,7 +273,7 @@ func autoConvert_kubeadm_APIServer_To_v1beta2_APIServer(in *kubeadm.APIServer, o
 		return err
 	}
 	out.CertSANs = *(*[]string)(unsafe.Pointer(&in.CertSANs))
-	out.TimeoutForControlPlane = (*v1.Duration)(unsafe.Pointer(in.TimeoutForControlPlane))
+	out.TimeoutForControlPlane = (*metav1.Duration)(unsafe.Pointer(in.TimeoutForControlPlane))
 	return nil
 }
 
@@ -414,7 +424,7 @@ func autoConvert_v1beta2_Discovery_To_kubeadm_Discovery(in *Discovery, out *kube
 	out.BootstrapToken = (*kubeadm.BootstrapTokenDiscovery)(unsafe.Pointer(in.BootstrapToken))
 	out.File = (*kubeadm.FileDiscovery)(unsafe.Pointer(in.File))
 	out.TLSBootstrapToken = in.TLSBootstrapToken
-	out.Timeout = (*v1.Duration)(unsafe.Pointer(in.Timeout))
+	out.Timeout = (*metav1.Duration)(unsafe.Pointer(in.Timeout))
 	return nil
 }
 
@@ -427,7 +437,7 @@ func autoConvert_kubeadm_Discovery_To_v1beta2_Discovery(in *kubeadm.Discovery, o
 	out.BootstrapToken = (*BootstrapTokenDiscovery)(unsafe.Pointer(in.BootstrapToken))
 	out.File = (*FileDiscovery)(unsafe.Pointer(in.File))
 	out.TLSBootstrapToken = in.TLSBootstrapToken
-	out.Timeout = (*v1.Duration)(unsafe.Pointer(in.Timeout))
+	out.Timeout = (*metav1.Duration)(unsafe.Pointer(in.Timeout))
 	return nil
 }
 
@@ -555,7 +565,17 @@ func Convert_kubeadm_ImageMeta_To_v1beta2_ImageMeta(in *kubeadm.ImageMeta, out *
 }
 
 func autoConvert_v1beta2_InitConfiguration_To_kubeadm_InitConfiguration(in *InitConfiguration, out *kubeadm.InitConfiguration, s conversion.Scope) error {
-	out.BootstrapTokens = *(*[]bootstraptokenv1.BootstrapToken)(unsafe.Pointer(&in.BootstrapTokens))
+	if in.BootstrapTokens != nil {
+		in, out := &in.BootstrapTokens, &out.BootstrapTokens
+		*out = make([]v1.BootstrapToken, len(*in))
+		for i := range *in {
+			if err := Convert_v1beta2_BootstrapToken_To_v1_BootstrapToken(&(*in)[i], &(*out)[i], s); err != nil {
+				return err
+			}
+		}
+	} else {
+		out.BootstrapTokens = nil
+	}
 	if err := Convert_v1beta2_NodeRegistrationOptions_To_kubeadm_NodeRegistrationOptions(&in.NodeRegistration, &out.NodeRegistration, s); err != nil {
 		return err
 	}
@@ -568,7 +588,17 @@ func autoConvert_v1beta2_InitConfiguration_To_kubeadm_InitConfiguration(in *Init
 
 func autoConvert_kubeadm_InitConfiguration_To_v1beta2_InitConfiguration(in *kubeadm.InitConfiguration, out *InitConfiguration, s conversion.Scope) error {
 	// WARNING: in.ClusterConfiguration requires manual conversion: does not exist in peer-type
-	out.BootstrapTokens = *(*[]BootstrapToken)(unsafe.Pointer(&in.BootstrapTokens))
+	if in.BootstrapTokens != nil {
+		in, out := &in.BootstrapTokens, &out.BootstrapTokens
+		*out = make([]BootstrapToken, len(*in))
+		for i := range *in {
+			if err := Convert_v1_BootstrapToken_To_v1beta2_BootstrapToken(&(*in)[i], &(*out)[i], s); err != nil {
+				return err
+			}
+		}
+	} else {
+		out.BootstrapTokens = nil
+	}
 	if err := Convert_kubeadm_NodeRegistrationOptions_To_v1beta2_NodeRegistrationOptions(&in.NodeRegistration, &out.NodeRegistration, s); err != nil {
 		return err
 	}
diff --git a/cmd/kubeadm/app/apis/output/v1alpha1/conversion.go b/cmd/kubeadm/app/apis/output/v1alpha1/conversion.go
new file mode 100644
index 00000000000..16943a19f91
--- /dev/null
+++ b/cmd/kubeadm/app/apis/output/v1alpha1/conversion.go
@@ -0,0 +1,37 @@
+/*
+Copyright 2021 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package v1alpha1
+
+import (
+	conversion "k8s.io/apimachinery/pkg/conversion"
+
+	kubeadmv1beta2 "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm/v1beta2"
+	output "k8s.io/kubernetes/cmd/kubeadm/app/apis/output"
+)
+
+// The conversion functions here are required since output.v1alpha2.BootstrapToken embeds
+// bootstraptoken.v1.BootstrapToken, instead of kubeadm.v1beta2.BootstrapToken.
+
+func Convert_v1alpha1_BootstrapToken_To_output_BootstrapToken(in *BootstrapToken, out *output.BootstrapToken, s conversion.Scope) error {
+	kubeadmv1beta2.Convert_v1beta2_BootstrapToken_To_v1_BootstrapToken(&in.BootstrapToken, &out.BootstrapToken, s)
+	return nil
+}
+
+func Convert_output_BootstrapToken_To_v1alpha1_BootstrapToken(in *output.BootstrapToken, out *BootstrapToken, s conversion.Scope) error {
+	kubeadmv1beta2.Convert_v1_BootstrapToken_To_v1beta2_BootstrapToken(&in.BootstrapToken, &out.BootstrapToken, s)
+	return nil
+}
diff --git a/cmd/kubeadm/app/apis/output/v1alpha1/zz_generated.conversion.go b/cmd/kubeadm/app/apis/output/v1alpha1/zz_generated.conversion.go
index d6ccca0e6e0..d6d619bd37e 100644
--- a/cmd/kubeadm/app/apis/output/v1alpha1/zz_generated.conversion.go
+++ b/cmd/kubeadm/app/apis/output/v1alpha1/zz_generated.conversion.go
@@ -26,6 +26,7 @@ import (
 
 	conversion "k8s.io/apimachinery/pkg/conversion"
 	runtime "k8s.io/apimachinery/pkg/runtime"
+	v1beta2 "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm/v1beta2"
 	output "k8s.io/kubernetes/cmd/kubeadm/app/apis/output"
 )
 
@@ -36,16 +37,6 @@ func init() {
 // RegisterConversions adds conversion functions to the given scheme.
 // Public to allow building arbitrary schemes.
 func RegisterConversions(s *runtime.Scheme) error {
-	if err := s.AddGeneratedConversionFunc((*BootstrapToken)(nil), (*output.BootstrapToken)(nil), func(a, b interface{}, scope conversion.Scope) error {
-		return Convert_v1alpha1_BootstrapToken_To_output_BootstrapToken(a.(*BootstrapToken), b.(*output.BootstrapToken), scope)
-	}); err != nil {
-		return err
-	}
-	if err := s.AddGeneratedConversionFunc((*output.BootstrapToken)(nil), (*BootstrapToken)(nil), func(a, b interface{}, scope conversion.Scope) error {
-		return Convert_output_BootstrapToken_To_v1alpha1_BootstrapToken(a.(*output.BootstrapToken), b.(*BootstrapToken), scope)
-	}); err != nil {
-		return err
-	}
 	if err := s.AddGeneratedConversionFunc((*ComponentConfigVersionState)(nil), (*output.ComponentConfigVersionState)(nil), func(a, b interface{}, scope conversion.Scope) error {
 		return Convert_v1alpha1_ComponentConfigVersionState_To_output_ComponentConfigVersionState(a.(*ComponentConfigVersionState), b.(*output.ComponentConfigVersionState), scope)
 	}); err != nil {
@@ -86,29 +77,33 @@ func RegisterConversions(s *runtime.Scheme) error {
 	}); err != nil {
 		return err
 	}
+	if err := s.AddConversionFunc((*output.BootstrapToken)(nil), (*BootstrapToken)(nil), func(a, b interface{}, scope conversion.Scope) error {
+		return Convert_output_BootstrapToken_To_v1alpha1_BootstrapToken(a.(*output.BootstrapToken), b.(*BootstrapToken), scope)
+	}); err != nil {
+		return err
+	}
+	if err := s.AddConversionFunc((*BootstrapToken)(nil), (*output.BootstrapToken)(nil), func(a, b interface{}, scope conversion.Scope) error {
+		return Convert_v1alpha1_BootstrapToken_To_output_BootstrapToken(a.(*BootstrapToken), b.(*output.BootstrapToken), scope)
+	}); err != nil {
+		return err
+	}
 	return nil
 }
 
 func autoConvert_v1alpha1_BootstrapToken_To_output_BootstrapToken(in *BootstrapToken, out *output.BootstrapToken, s conversion.Scope) error {
-	out.BootstrapToken = in.BootstrapToken
+	if err := v1beta2.Convert_v1beta2_BootstrapToken_To_v1_BootstrapToken(&in.BootstrapToken, &out.BootstrapToken, s); err != nil {
+		return err
+	}
 	return nil
 }
 
-// Convert_v1alpha1_BootstrapToken_To_output_BootstrapToken is an autogenerated conversion function.
-func Convert_v1alpha1_BootstrapToken_To_output_BootstrapToken(in *BootstrapToken, out *output.BootstrapToken, s conversion.Scope) error {
-	return autoConvert_v1alpha1_BootstrapToken_To_output_BootstrapToken(in, out, s)
-}
-
 func autoConvert_output_BootstrapToken_To_v1alpha1_BootstrapToken(in *output.BootstrapToken, out *BootstrapToken, s conversion.Scope) error {
-	out.BootstrapToken = in.BootstrapToken
+	if err := v1beta2.Convert_v1_BootstrapToken_To_v1beta2_BootstrapToken(&in.BootstrapToken, &out.BootstrapToken, s); err != nil {
+		return err
+	}
 	return nil
 }
 
-// Convert_output_BootstrapToken_To_v1alpha1_BootstrapToken is an autogenerated conversion function.
-func Convert_output_BootstrapToken_To_v1alpha1_BootstrapToken(in *output.BootstrapToken, out *BootstrapToken, s conversion.Scope) error {
-	return autoConvert_output_BootstrapToken_To_v1alpha1_BootstrapToken(in, out, s)
-}
-
 func autoConvert_v1alpha1_ComponentConfigVersionState_To_output_ComponentConfigVersionState(in *ComponentConfigVersionState, out *output.ComponentConfigVersionState, s conversion.Scope) error {
 	out.Group = in.Group
 	out.CurrentVersion = in.CurrentVersion