diff --git a/dev/docker/env b/dev/docker/env
index f4b6cead..c3440a8a 100755
--- a/dev/docker/env
+++ b/dev/docker/env
@@ -2,5 +2,5 @@
 set -e
 
 function docker_compose() {
-  docker-compose -f dev/docker/docker-compose.yml -p xmtpd "$@"
+  docker compose -f dev/docker/docker-compose.yml -p xmtpd "$@"
 }
diff --git a/dev/e2e/docker/env b/dev/e2e/docker/env
index bb308135..5064cdbf 100755
--- a/dev/e2e/docker/env
+++ b/dev/e2e/docker/env
@@ -2,5 +2,5 @@
 set -e
 
 function docker_compose() {
-  docker-compose -f dev/e2e/docker/docker-compose.yml -p xmtpd-e2e "$@"
+  docker compose -f dev/e2e/docker/docker-compose.yml -p xmtpd-e2e "$@"
 }
diff --git a/pkg/migrations/mls/20240814032323_remove-inbox-id-from-installation.down.sql b/pkg/migrations/mls/20240814032323_remove-inbox-id-from-installation.down.sql
new file mode 100644
index 00000000..cc72f6bf
--- /dev/null
+++ b/pkg/migrations/mls/20240814032323_remove-inbox-id-from-installation.down.sql
@@ -0,0 +1,7 @@
+SET statement_timeout = 0;
+
+--bun:split
+ALTER TABLE installations
+	ADD COLUMN inbox_id BYTEA NOT NULL,
+	ADD COLUMN expiration BIGINT NOT NULL;
+
diff --git a/pkg/migrations/mls/20240814032323_remove-inbox-id-from-installation.up.sql b/pkg/migrations/mls/20240814032323_remove-inbox-id-from-installation.up.sql
new file mode 100644
index 00000000..9b12bee1
--- /dev/null
+++ b/pkg/migrations/mls/20240814032323_remove-inbox-id-from-installation.up.sql
@@ -0,0 +1,7 @@
+SET statement_timeout = 0;
+
+--bun:split
+ALTER TABLE installations
+	DROP COLUMN IF EXISTS inbox_id,
+	DROP COLUMN IF EXISTS expiration;
+
diff --git a/pkg/mls/api/v1/service.go b/pkg/mls/api/v1/service.go
index 56c18c67..b3003ca1 100644
--- a/pkg/mls/api/v1/service.go
+++ b/pkg/mls/api/v1/service.go
@@ -113,6 +113,11 @@ func (s *Service) HandleIncomingWakuRelayMessage(wakuMsg *wakupb.WakuMessage) er
 	return nil
 }
 
+/*
+*
+DEPRECATED: Use UploadKeyPackage instead
+*
+*/
 func (s *Service) RegisterInstallation(ctx context.Context, req *mlsv1.RegisterInstallationRequest) (*mlsv1.RegisterInstallationResponse, error) {
 	if err := validateRegisterInstallationRequest(req); err != nil {
 		return nil, err
@@ -126,9 +131,9 @@ func (s *Service) RegisterInstallation(ctx context.Context, req *mlsv1.RegisterI
 	if len(results) != 1 {
 		return nil, status.Errorf(codes.Internal, "unexpected number of results: %d", len(results))
 	}
+
 	installationKey := results[0].InstallationKey
-	credential := results[0].Credential
-	if err = s.store.CreateInstallation(ctx, installationKey, credential.InboxId, req.KeyPackage.KeyPackageTlsSerialized, results[0].Expiration); err != nil {
+	if err = s.store.CreateOrUpdateInstallation(ctx, installationKey, req.KeyPackage.KeyPackageTlsSerialized); err != nil {
 		return nil, err
 	}
 	return &mlsv1.RegisterInstallationResponse{
@@ -178,9 +183,8 @@ func (s *Service) UploadKeyPackage(ctx context.Context, req *mlsv1.UploadKeyPack
 	}
 
 	installationId := validationResults[0].InstallationKey
-	expiration := validationResults[0].Expiration
 
-	if err = s.store.UpdateKeyPackage(ctx, installationId, keyPackageBytes, expiration); err != nil {
+	if err = s.store.CreateOrUpdateInstallation(ctx, installationId, keyPackageBytes); err != nil {
 		return nil, status.Errorf(codes.Internal, "failed to insert key packages: %s", err)
 	}
 
diff --git a/pkg/mls/api/v1/service_test.go b/pkg/mls/api/v1/service_test.go
index 479bdd78..a02615ad 100644
--- a/pkg/mls/api/v1/service_test.go
+++ b/pkg/mls/api/v1/service_test.go
@@ -81,13 +81,13 @@ func TestRegisterInstallation(t *testing.T) {
 	defer cleanup()
 
 	installationId := test.RandomBytes(32)
-	inboxId := test.RandomInboxId()
+	keyPackage := []byte("test")
 
-	mockValidateInboxIdKeyPackages(mlsValidationService, installationId, inboxId)
+	mockValidateInboxIdKeyPackages(mlsValidationService, installationId, test.RandomInboxId())
 
 	res, err := svc.RegisterInstallation(ctx, &mlsv1.RegisterInstallationRequest{
 		KeyPackage: &mlsv1.KeyPackageUpload{
-			KeyPackageTlsSerialized: []byte("test"),
+			KeyPackageTlsSerialized: keyPackage,
 		},
 		IsInboxIdCredential: false,
 	})
@@ -98,7 +98,8 @@ func TestRegisterInstallation(t *testing.T) {
 	installation, err := queries.New(mlsDb.DB).GetInstallation(ctx, installationId)
 	require.NoError(t, err)
 
-	require.Equal(t, inboxId, installation.InboxID)
+	require.Equal(t, installationId, installation.ID)
+	require.Equal(t, []byte("test"), installation.KeyPackage)
 }
 
 func TestRegisterInstallationError(t *testing.T) {
diff --git a/pkg/mls/store/queries.sql b/pkg/mls/store/queries.sql
index 561c69ae..d54a7e45 100644
--- a/pkg/mls/store/queries.sql
+++ b/pkg/mls/store/queries.sql
@@ -83,33 +83,24 @@ WHERE (address, inbox_id, association_sequence_id) =(
 		address,
 		inbox_id);
 
--- name: CreateInstallation :exec
-INSERT INTO installations(id, created_at, updated_at, inbox_id, key_package, expiration)
-	VALUES (@id, @created_at, @updated_at, decode(@inbox_id, 'hex'), @key_package, @expiration);
+-- name: CreateOrUpdateInstallation :exec
+INSERT INTO installations(id, created_at, updated_at, key_package)
+	VALUES (@id, @created_at, @updated_at, @key_package)
+ON CONFLICT (id)
+	DO UPDATE SET
+		key_package = @key_package, updated_at = @updated_at;
 
 -- name: GetInstallation :one
 SELECT
 	id,
 	created_at,
 	updated_at,
-	encode(inbox_id, 'hex') AS inbox_id,
-	key_package,
-	expiration
+	key_package
 FROM
 	installations
 WHERE
 	id = $1;
 
--- name: UpdateKeyPackage :execrows
-UPDATE
-	installations
-SET
-	key_package = @key_package,
-	updated_at = @updated_at,
-	expiration = @expiration
-WHERE
-	id = @id;
-
 -- name: FetchKeyPackages :many
 SELECT
 	id,
diff --git a/pkg/mls/store/queries/models.go b/pkg/mls/store/queries/models.go
index 462220c6..3943a55a 100644
--- a/pkg/mls/store/queries/models.go
+++ b/pkg/mls/store/queries/models.go
@@ -35,9 +35,7 @@ type Installation struct {
 	ID         []byte
 	CreatedAt  int64
 	UpdatedAt  int64
-	InboxID    []byte
 	KeyPackage []byte
-	Expiration int64
 }
 
 type WelcomeMessage struct {
diff --git a/pkg/mls/store/queries/queries.sql.go b/pkg/mls/store/queries/queries.sql.go
index 33428a08..90b51b14 100644
--- a/pkg/mls/store/queries/queries.sql.go
+++ b/pkg/mls/store/queries/queries.sql.go
@@ -13,28 +13,27 @@ import (
 	"github.com/lib/pq"
 )
 
-const createInstallation = `-- name: CreateInstallation :exec
-INSERT INTO installations(id, created_at, updated_at, inbox_id, key_package, expiration)
-	VALUES ($1, $2, $3, decode($4, 'hex'), $5, $6)
+const createOrUpdateInstallation = `-- name: CreateOrUpdateInstallation :exec
+INSERT INTO installations(id, created_at, updated_at, key_package)
+	VALUES ($1, $2, $3, $4)
+ON CONFLICT (id)
+	DO UPDATE SET
+		key_package = $4, updated_at = $3
 `
 
-type CreateInstallationParams struct {
+type CreateOrUpdateInstallationParams struct {
 	ID         []byte
 	CreatedAt  int64
 	UpdatedAt  int64
-	InboxID    string
 	KeyPackage []byte
-	Expiration int64
 }
 
-func (q *Queries) CreateInstallation(ctx context.Context, arg CreateInstallationParams) error {
-	_, err := q.db.ExecContext(ctx, createInstallation,
+func (q *Queries) CreateOrUpdateInstallation(ctx context.Context, arg CreateOrUpdateInstallationParams) error {
+	_, err := q.db.ExecContext(ctx, createOrUpdateInstallation,
 		arg.ID,
 		arg.CreatedAt,
 		arg.UpdatedAt,
-		arg.InboxID,
 		arg.KeyPackage,
-		arg.Expiration,
 	)
 	return err
 }
@@ -305,34 +304,21 @@ SELECT
 	id,
 	created_at,
 	updated_at,
-	encode(inbox_id, 'hex') AS inbox_id,
-	key_package,
-	expiration
+	key_package
 FROM
 	installations
 WHERE
 	id = $1
 `
 
-type GetInstallationRow struct {
-	ID         []byte
-	CreatedAt  int64
-	UpdatedAt  int64
-	InboxID    string
-	KeyPackage []byte
-	Expiration int64
-}
-
-func (q *Queries) GetInstallation(ctx context.Context, id []byte) (GetInstallationRow, error) {
+func (q *Queries) GetInstallation(ctx context.Context, id []byte) (Installation, error) {
 	row := q.db.QueryRowContext(ctx, getInstallation, id)
-	var i GetInstallationRow
+	var i Installation
 	err := row.Scan(
 		&i.ID,
 		&i.CreatedAt,
 		&i.UpdatedAt,
-		&i.InboxID,
 		&i.KeyPackage,
-		&i.Expiration,
 	)
 	return i, err
 }
@@ -786,34 +772,3 @@ func (q *Queries) RevokeAddressFromLog(ctx context.Context, arg RevokeAddressFro
 	_, err := q.db.ExecContext(ctx, revokeAddressFromLog, arg.RevocationSequenceID, arg.Address, arg.InboxID)
 	return err
 }
-
-const updateKeyPackage = `-- name: UpdateKeyPackage :execrows
-UPDATE
-	installations
-SET
-	key_package = $1,
-	updated_at = $2,
-	expiration = $3
-WHERE
-	id = $4
-`
-
-type UpdateKeyPackageParams struct {
-	KeyPackage []byte
-	UpdatedAt  int64
-	Expiration int64
-	ID         []byte
-}
-
-func (q *Queries) UpdateKeyPackage(ctx context.Context, arg UpdateKeyPackageParams) (int64, error) {
-	result, err := q.db.ExecContext(ctx, updateKeyPackage,
-		arg.KeyPackage,
-		arg.UpdatedAt,
-		arg.Expiration,
-		arg.ID,
-	)
-	if err != nil {
-		return 0, err
-	}
-	return result.RowsAffected()
-}
diff --git a/pkg/mls/store/store.go b/pkg/mls/store/store.go
index 0aa62af4..75cfec87 100644
--- a/pkg/mls/store/store.go
+++ b/pkg/mls/store/store.go
@@ -39,8 +39,7 @@ type IdentityStore interface {
 type MlsStore interface {
 	IdentityStore
 
-	CreateInstallation(ctx context.Context, installationId []byte, inboxId string, keyPackage []byte, expiration uint64) error
-	UpdateKeyPackage(ctx context.Context, installationId, keyPackage []byte, expiration uint64) error
+	CreateOrUpdateInstallation(ctx context.Context, installationId []byte, keyPackage []byte) error
 	FetchKeyPackages(ctx context.Context, installationIds [][]byte) ([]queries.FetchKeyPackagesRow, error)
 	InsertGroupMessage(ctx context.Context, groupId []byte, data []byte) (*queries.GroupMessage, error)
 	InsertWelcomeMessage(ctx context.Context, installationId []byte, data []byte, hpkePublicKey []byte) (*queries.WelcomeMessage, error)
@@ -246,38 +245,17 @@ func (s *Store) GetInboxLogs(ctx context.Context, batched_req *identity.GetIdent
 }
 
 // Creates the installation and last resort key package
-func (s *Store) CreateInstallation(ctx context.Context, installationId []byte, inboxId string, keyPackage []byte, expiration uint64) error {
-	createdAt := nowNs()
+func (s *Store) CreateOrUpdateInstallation(ctx context.Context, installationId []byte, keyPackage []byte) error {
+	now := nowNs()
 
-	return s.queries.CreateInstallation(ctx, queries.CreateInstallationParams{
+	return s.queries.CreateOrUpdateInstallation(ctx, queries.CreateOrUpdateInstallationParams{
 		ID:         installationId,
-		CreatedAt:  createdAt,
-		InboxID:    inboxId,
+		CreatedAt:  now,
+		UpdatedAt:  now,
 		KeyPackage: keyPackage,
-		Expiration: int64(expiration),
 	})
 }
 
-// Insert a new key package, ignoring any that may already exist
-func (s *Store) UpdateKeyPackage(ctx context.Context, installationId, keyPackage []byte, expiration uint64) error {
-	rowsUpdated, err := s.queries.UpdateKeyPackage(ctx, queries.UpdateKeyPackageParams{
-		ID:         installationId,
-		UpdatedAt:  nowNs(),
-		KeyPackage: keyPackage,
-		Expiration: int64(expiration),
-	})
-
-	if err != nil {
-		return err
-	}
-
-	if rowsUpdated == 0 {
-		return errors.New("installation id unknown")
-	}
-
-	return nil
-}
-
 func (s *Store) FetchKeyPackages(ctx context.Context, installationIds [][]byte) ([]queries.FetchKeyPackagesRow, error) {
 	return s.queries.FetchKeyPackages(ctx, installationIds)
 }
diff --git a/pkg/mls/store/store_test.go b/pkg/mls/store/store_test.go
index 1ff9f73d..8cc32ac2 100644
--- a/pkg/mls/store/store_test.go
+++ b/pkg/mls/store/store_test.go
@@ -169,9 +169,8 @@ func TestCreateInstallation(t *testing.T) {
 
 	ctx := context.Background()
 	installationId := test.RandomBytes(32)
-	inboxId := test.RandomInboxId()
 
-	err := store.CreateInstallation(ctx, installationId, inboxId, test.RandomBytes(32), 0)
+	err := store.CreateOrUpdateInstallation(ctx, installationId, test.RandomBytes(32))
 	require.NoError(t, err)
 
 	installationFromDb, err := store.queries.GetInstallation(ctx, installationId)
@@ -185,21 +184,23 @@ func TestUpdateKeyPackage(t *testing.T) {
 
 	ctx := context.Background()
 	installationId := test.RandomBytes(32)
-	inboxId := test.RandomInboxId()
 	keyPackage := test.RandomBytes(32)
 
-	err := store.CreateInstallation(ctx, installationId, inboxId, keyPackage, 0)
+	err := store.CreateOrUpdateInstallation(ctx, installationId, keyPackage)
+	require.NoError(t, err)
+	afterCreate, err := store.queries.GetInstallation(ctx, installationId)
 	require.NoError(t, err)
 
 	keyPackage2 := test.RandomBytes(32)
-	err = store.UpdateKeyPackage(ctx, installationId, keyPackage2, 1)
+	err = store.CreateOrUpdateInstallation(ctx, installationId, keyPackage2)
 	require.NoError(t, err)
 
 	installationFromDb, err := store.queries.GetInstallation(ctx, installationId)
 	require.NoError(t, err)
 
 	require.Equal(t, keyPackage2, installationFromDb.KeyPackage)
-	require.Equal(t, int64(1), installationFromDb.Expiration)
+	require.Greater(t, installationFromDb.UpdatedAt, afterCreate.UpdatedAt)
+	require.Equal(t, installationFromDb.CreatedAt, afterCreate.CreatedAt)
 }
 
 func TestConsumeLastResortKeyPackage(t *testing.T) {
@@ -209,9 +210,8 @@ func TestConsumeLastResortKeyPackage(t *testing.T) {
 	ctx := context.Background()
 	installationId := test.RandomBytes(32)
 	keyPackage := test.RandomBytes(32)
-	inboxId := test.RandomInboxId()
 
-	err := store.CreateInstallation(ctx, installationId, inboxId, keyPackage, 0)
+	err := store.CreateOrUpdateInstallation(ctx, installationId, keyPackage)
 	require.NoError(t, err)
 
 	fetchResult, err := store.FetchKeyPackages(ctx, [][]byte{installationId})
diff --git a/pkg/mlsvalidate/service.go b/pkg/mlsvalidate/service.go
index da16820a..af03ba84 100644
--- a/pkg/mlsvalidate/service.go
+++ b/pkg/mlsvalidate/service.go
@@ -87,11 +87,6 @@ func (s *MLSValidationServiceImpl) GetAssociationState(ctx context.Context, oldU
 	}, nil
 }
 
-type KeyAndExpiration struct {
-	InstallationId []byte
-	Expiration     uint64
-}
-
 func (s *MLSValidationServiceImpl) ValidateInboxIdKeyPackages(ctx context.Context, keyPackages [][]byte) ([]InboxIdValidationResult, error) {
 	req := makeValidateKeyPackageRequest(keyPackages, true)
 
@@ -100,69 +95,20 @@ func (s *MLSValidationServiceImpl) ValidateInboxIdKeyPackages(ctx context.Contex
 		return nil, err
 	}
 
-	keyPackageCredential := make(map[string]KeyAndExpiration, len(response.Responses))
-	identityUpdatesRequest := make([]*identity.GetIdentityUpdatesRequest_Request, len(response.Responses))
-	for i, response := range response.Responses {
-		if !response.IsOk {
-			return nil, fmt.Errorf("validation failed with error %s", response.ErrorMessage)
-		}
-		keyPackageCredential[response.Credential.InboxId] = KeyAndExpiration{
-			InstallationId: response.InstallationPublicKey,
-			Expiration:     response.Expiration,
-		}
-		identityUpdatesRequest[i] = &identity.GetIdentityUpdatesRequest_Request{
-			InboxId:    response.Credential.InboxId,
-			SequenceId: 0,
-		}
-	}
-
-	// TODO: do we need to take sequence ID Into account?
-	request := &identity.GetIdentityUpdatesRequest{Requests: identityUpdatesRequest}
-	identity_updates, err := s.identityStore.GetInboxLogs(ctx, request)
-	if err != nil {
-		return nil, err
-	}
-
-	validation_requests := make([]*svc.ValidateInboxIdsRequest_ValidationRequest, len(identity_updates.Responses))
-	for i, response := range identity_updates.Responses {
-		validation_requests[i] = makeValidationRequest(response, keyPackageCredential)
-	}
-
-	validation_request := svc.ValidateInboxIdsRequest{Requests: validation_requests}
-	validate_inbox_response, err := s.grpcClient.ValidateInboxIds(ctx, &validation_request)
-	if err != nil {
-		return nil, err
-	}
-
 	out := make([]InboxIdValidationResult, len(response.Responses))
-	for i, response := range validate_inbox_response.Responses {
+	for i, response := range response.Responses {
 		if !response.IsOk {
 			return nil, fmt.Errorf("validation failed with error %s", response.ErrorMessage)
 		}
 		out[i] = InboxIdValidationResult{
-			InstallationKey: keyPackageCredential[response.InboxId].InstallationId,
-			Credential:      &identity_proto.MlsCredential{InboxId: response.InboxId},
-			Expiration:      keyPackageCredential[response.InboxId].Expiration,
+			InstallationKey: response.InstallationPublicKey,
+			Credential:      nil,
+			Expiration:      response.Expiration,
 		}
 	}
 	return out, nil
 }
 
-func makeValidationRequest(update *identity.GetIdentityUpdatesResponse_Response, pub_keys map[string]KeyAndExpiration) *svc.ValidateInboxIdsRequest_ValidationRequest {
-	identity_updates := make([]*associations.IdentityUpdate, len(update.Updates))
-	for i, identity_log := range update.Updates {
-		identity_updates[i] = identity_log.Update
-	}
-
-	out := svc.ValidateInboxIdsRequest_ValidationRequest{
-		Credential:            &identity_proto.MlsCredential{InboxId: update.InboxId},
-		InstallationPublicKey: pub_keys[update.InboxId].InstallationId,
-		IdentityUpdates:       identity_updates,
-	}
-
-	return &out
-}
-
 func (s *MLSValidationServiceImpl) ValidateV3KeyPackages(ctx context.Context, keyPackages [][]byte) ([]IdentityValidationResult, error) {
 	req := makeValidateKeyPackageRequest(keyPackages, false)