diff --git a/docs/stackit_mongodbflex_instance_create.md b/docs/stackit_mongodbflex_instance_create.md
index a3cb372a..e8303cc0 100644
--- a/docs/stackit_mongodbflex_instance_create.md
+++ b/docs/stackit_mongodbflex_instance_create.md
@@ -36,7 +36,7 @@ stackit mongodbflex instance create [flags]
       --storage-class string     Storage class (default "premium-perf2-mongodb")
       --storage-size int         Storage size (in GB) (default 10)
       --type string              Instance type, one of ["Replica" "Sharded" "Single"] (default "Replica")
-      --version string           Version (default "6.0")
+      --version string           MongoDB version. Defaults to the latest version available
 ```
 
 ### Options inherited from parent commands
diff --git a/internal/cmd/mongodbflex/instance/create/create.go b/internal/cmd/mongodbflex/instance/create/create.go
index 1c96c251..e51b4353 100644
--- a/internal/cmd/mongodbflex/instance/create/create.go
+++ b/internal/cmd/mongodbflex/instance/create/create.go
@@ -38,7 +38,6 @@ const (
 	defaultStorageClass   = "premium-perf2-mongodb"
 	defaultStorageSize    = 10
 	defaultType           = "Replica"
-	defaultVersion        = "6.0"
 )
 
 type inputModel struct {
@@ -100,6 +99,15 @@ func NewCmd() *cobra.Command {
 				}
 			}
 
+			// Fill in version, if needed
+			if model.Version == nil {
+				version, err := mongodbflexUtils.GetLatestMongoDBVersion(ctx, apiClient, model.ProjectId)
+				if err != nil {
+					return fmt.Errorf("get latest MongoDB version: %w", err)
+				}
+				model.Version = &version
+			}
+
 			// Call API
 			req, err := buildRequest(ctx, model, apiClient)
 			if err != nil {
@@ -145,7 +153,7 @@ func configureFlags(cmd *cobra.Command) {
 	cmd.Flags().Int64(ramFlag, 0, "Amount of RAM (in GB)")
 	cmd.Flags().String(storageClassFlag, defaultStorageClass, "Storage class")
 	cmd.Flags().Int64(storageSizeFlag, defaultStorageSize, "Storage size (in GB)")
-	cmd.Flags().String(versionFlag, defaultVersion, "Version")
+	cmd.Flags().String(versionFlag, "", "MongoDB version. Defaults to the latest version available")
 	cmd.Flags().Var(flags.EnumFlag(false, defaultType, typeFlagOptions...), typeFlag, fmt.Sprintf("Instance type, one of %q", typeFlagOptions))
 
 	err := flags.MarkFlagsRequired(cmd, instanceNameFlag, aclFlag)
@@ -187,7 +195,7 @@ func parseInput(cmd *cobra.Command) (*inputModel, error) {
 		RAM:             ram,
 		StorageClass:    utils.Ptr(flags.FlagWithDefaultToStringValue(cmd, storageClassFlag)),
 		StorageSize:     &storageSize,
-		Version:         utils.Ptr(flags.FlagWithDefaultToStringValue(cmd, versionFlag)),
+		Version:         flags.FlagToStringPointer(cmd, versionFlag),
 		Type:            utils.Ptr(flags.FlagWithDefaultToStringValue(cmd, typeFlag)),
 	}, nil
 }
diff --git a/internal/cmd/mongodbflex/instance/create/create_test.go b/internal/cmd/mongodbflex/instance/create/create_test.go
index d9ae6a3d..44fbaa2d 100644
--- a/internal/cmd/mongodbflex/instance/create/create_test.go
+++ b/internal/cmd/mongodbflex/instance/create/create_test.go
@@ -136,7 +136,6 @@ func TestParseInput(t *testing.T) {
 			description: "with defaults",
 			flagValues: fixtureFlagValues(func(flagValues map[string]string) {
 				delete(flagValues, backupScheduleFlag)
-				delete(flagValues, versionFlag)
 				delete(flagValues, typeFlag)
 			}),
 			isValid:       true,
@@ -204,6 +203,16 @@ func TestParseInput(t *testing.T) {
 			}),
 			isValid: false,
 		},
+		{
+			description: "no version",
+			flagValues: fixtureFlagValues(func(flagValues map[string]string) {
+				delete(flagValues, versionFlag)
+			}),
+			isValid: true,
+			expectedModel: fixtureInputModel(func(model *inputModel) {
+				model.Version = nil
+			}),
+		},
 		{
 			description: "repeated acl flags",
 			flagValues:  fixtureFlagValues(),
diff --git a/internal/cmd/postgresflex/instance/create/create.go b/internal/cmd/postgresflex/instance/create/create.go
index 5650e949..848ea4f0 100644
--- a/internal/cmd/postgresflex/instance/create/create.go
+++ b/internal/cmd/postgresflex/instance/create/create.go
@@ -99,7 +99,7 @@ func NewCmd() *cobra.Command {
 				}
 			}
 
-			// Fill in defautl version, if needed
+			// Fill in version, if needed
 			if model.Version == nil {
 				version, err := postgresflexUtils.GetLatestPostgreSQLVersion(ctx, apiClient, model.ProjectId)
 				if err != nil {
diff --git a/internal/pkg/services/mongodbflex/utils/utils.go b/internal/pkg/services/mongodbflex/utils/utils.go
index 7c1c574a..0536a724 100644
--- a/internal/pkg/services/mongodbflex/utils/utils.go
+++ b/internal/pkg/services/mongodbflex/utils/utils.go
@@ -6,6 +6,7 @@ import (
 	"strings"
 
 	"github.com/stackitcloud/stackit-cli/internal/pkg/errors"
+	"golang.org/x/mod/semver"
 
 	"github.com/stackitcloud/stackit-sdk-go/services/mongodbflex"
 )
@@ -17,14 +18,6 @@ var instanceTypeToReplicas = map[string]int64{
 	"Sharded": 9,
 }
 
-func GetUserName(ctx context.Context, apiClient MongoDBFlexClient, projectId, instanceId, userId string) (string, error) {
-	resp, err := apiClient.GetUserExecute(ctx, projectId, instanceId, userId)
-	if err != nil {
-		return "", fmt.Errorf("get MongoDBFlex user: %w", err)
-	}
-	return *resp.Item.Username, nil
-}
-
 func AvailableInstanceTypes() []string {
 	instanceTypes := make([]string, len(instanceTypeToReplicas))
 	i := 0
@@ -118,10 +111,33 @@ func LoadFlavorId(cpu, ram int64, flavors *[]mongodbflex.HandlersInfraFlavor) (*
 }
 
 type MongoDBFlexClient interface {
+	ListVersionsExecute(ctx context.Context, projectId string) (*mongodbflex.ListVersionsResponse, error)
 	GetInstanceExecute(ctx context.Context, projectId, instanceId string) (*mongodbflex.GetInstanceResponse, error)
 	GetUserExecute(ctx context.Context, projectId, instanceId, userId string) (*mongodbflex.GetUserResponse, error)
 }
 
+func GetLatestMongoDBVersion(ctx context.Context, apiClient MongoDBFlexClient, projectId string) (string, error) {
+	resp, err := apiClient.ListVersionsExecute(ctx, projectId)
+	if err != nil {
+		return "", fmt.Errorf("get MongoDB versions: %w", err)
+	}
+	versions := *resp.Versions
+
+	latestVersion := "0"
+	for i := range versions {
+		oldSemVer := fmt.Sprintf("v%s", latestVersion)
+		newSemVer := fmt.Sprintf("v%s", versions[i])
+		if semver.Compare(newSemVer, oldSemVer) != 1 {
+			continue
+		}
+		latestVersion = versions[i]
+	}
+	if latestVersion == "0" {
+		return "", fmt.Errorf("no MongoDB versions found")
+	}
+	return latestVersion, nil
+}
+
 func GetInstanceName(ctx context.Context, apiClient MongoDBFlexClient, projectId, instanceId string) (string, error) {
 	resp, err := apiClient.GetInstanceExecute(ctx, projectId, instanceId)
 	if err != nil {
@@ -129,3 +145,11 @@ func GetInstanceName(ctx context.Context, apiClient MongoDBFlexClient, projectId
 	}
 	return *resp.Item.Name, nil
 }
+
+func GetUserName(ctx context.Context, apiClient MongoDBFlexClient, projectId, instanceId, userId string) (string, error) {
+	resp, err := apiClient.GetUserExecute(ctx, projectId, instanceId, userId)
+	if err != nil {
+		return "", fmt.Errorf("get MongoDBFlex user: %w", err)
+	}
+	return *resp.Item.Username, nil
+}
diff --git a/internal/pkg/services/mongodbflex/utils/utils_test.go b/internal/pkg/services/mongodbflex/utils/utils_test.go
index 604a8fe8..c8339e82 100644
--- a/internal/pkg/services/mongodbflex/utils/utils_test.go
+++ b/internal/pkg/services/mongodbflex/utils/utils_test.go
@@ -24,10 +24,19 @@ const (
 )
 
 type mongoDBFlexClientMocked struct {
-	getInstanceFails bool
-	getInstanceResp  *mongodbflex.GetInstanceResponse
-	getUserFails     bool
-	getUserResp      *mongodbflex.GetUserResponse
+	listVersionsFails bool
+	listVersionsResp  *mongodbflex.ListVersionsResponse
+	getInstanceFails  bool
+	getInstanceResp   *mongodbflex.GetInstanceResponse
+	getUserFails      bool
+	getUserResp       *mongodbflex.GetUserResponse
+}
+
+func (m *mongoDBFlexClientMocked) ListVersionsExecute(_ context.Context, _ string) (*mongodbflex.ListVersionsResponse, error) {
+	if m.listVersionsFails {
+		return nil, fmt.Errorf("could not list versions")
+	}
+	return m.listVersionsResp, nil
 }
 
 func (m *mongoDBFlexClientMocked) GetInstanceExecute(_ context.Context, _, _ string) (*mongodbflex.GetInstanceResponse, error) {
@@ -355,6 +364,61 @@ func TestLoadFlavorId(t *testing.T) {
 	}
 }
 
+func TestGetLatestPostgreSQLVersion(t *testing.T) {
+	tests := []struct {
+		description       string
+		listVersionsFails bool
+		listVersionsResp  *mongodbflex.ListVersionsResponse
+		isValid           bool
+		expectedOutput    string
+	}{
+		{
+			description: "base",
+			listVersionsResp: &mongodbflex.ListVersionsResponse{
+				Versions: &[]string{"8", "10", "9"},
+			},
+			isValid:        true,
+			expectedOutput: "10",
+		},
+		{
+			description:       "get instance fails",
+			listVersionsFails: true,
+			isValid:           false,
+		},
+		{
+			description: "no versions",
+			listVersionsResp: &mongodbflex.ListVersionsResponse{
+				Versions: &[]string{},
+			},
+			isValid: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.description, func(t *testing.T) {
+			client := &mongoDBFlexClientMocked{
+				listVersionsFails: tt.listVersionsFails,
+				listVersionsResp:  tt.listVersionsResp,
+			}
+
+			output, err := GetLatestMongoDBVersion(context.Background(), client, testProjectId)
+
+			if tt.isValid && err != nil {
+				t.Errorf("failed on valid input")
+			}
+			if !tt.isValid && err == nil {
+				t.Errorf("did not fail on invalid input")
+			}
+			if !tt.isValid {
+				return
+			}
+			if output != tt.expectedOutput {
+				t.Errorf("expected output to be %s, got %s", tt.expectedOutput, output)
+			}
+		})
+	}
+}
+
 func TestGetInstanceName(t *testing.T) {
 	tests := []struct {
 		description      string