diff --git a/cliparser/cliparser.go b/cliparser/cliparser.go
index b974708..c8ccfac 100644
--- a/cliparser/cliparser.go
+++ b/cliparser/cliparser.go
@@ -32,6 +32,7 @@ var OfflineValidateMode = "validate_offline"
 var ConfigureMode = "configure"
 var CreateStackMode = "create-stack"
 var DestroyStackMode = "delete-stack"
+var UpdateStackMode = "update-stack"
 var MfaMode = "mfa"
 
 type CliArguments struct {
@@ -88,6 +89,13 @@ func ParseCliArguments(args []string) (cliArguments CliArguments, err error) {
 		deleteStack     = app.Command(DestroyStackMode, "Deletes a stack on aws")
 		deleteStackName = deleteStack.Arg("stack", "An AWS stack name.").Required().String()
 
+		updateStack             = app.Command(UpdateStackMode, "Updates a stack on aws")
+		updateStackName         = updateStack.Arg("stack", "An AWS stack name").String()
+		updateStackTemplate     = updateStack.Arg("template", "A path to the template file.").String()
+		updateStackImpName      = updateStack.Flag("stack", "Sn AWS stack name.").String()
+		updateStackImpTemplate  = updateStack.Flag("template", "A path to the template file.").String()
+		updateStackCapabilities = updateStack.Flag("capabilities", "Capabilities: CAPABILITY_IAM | CAPABILITY_NAMED_IAM").Enums("CAPABILITY_IAM", "CAPABILITY_NAMED_IAM")
+
 		mfaCommand = app.Command(MfaMode, "Create temporary secure credentials with MFA.")
 	)
 
@@ -133,6 +141,23 @@ func ParseCliArguments(args []string) (cliArguments CliArguments, err error) {
 	case mfaCommand.FullCommand():
 		cliArguments.Mode = &MfaMode
 
+		// update Stack
+	case updateStack.FullCommand():
+		cliArguments.Mode = &UpdateStackMode
+		cliArguments.Capabilities = updateStackCapabilities
+		if len(*updateStackImpTemplate) > 0 && len(*updateStackImpName) > 0 {
+			cliArguments.Stack = updateStackImpName
+			cliArguments.TemplatePath = updateStackImpTemplate
+		} else if len(*updateStackName) > 0 && len(*updateStackTemplate) > 0 {
+			cliArguments.Stack = updateStackName
+			cliArguments.TemplatePath = updateStackTemplate
+		} else if len(*updateStackName) > 0 && len(*updateStackImpTemplate) > 0 {
+			cliArguments.Stack = updateStackName
+			cliArguments.TemplatePath = updateStackImpTemplate
+		} else {
+			err = errors.New("You have to specify stack name and template file, try --help")
+			return
+		}
 	}
 
 	// OTHER FLAGS
diff --git a/main.go b/main.go
index a9efd01..a1c2c79 100644
--- a/main.go
+++ b/main.go
@@ -89,4 +89,10 @@ func main() {
 			os.Exit(1)
 		}
 	}
+
+	if *context.CliArguments.Mode == cliparser.UpdateStackMode {
+		stack.UpdateStack(&context)
+		os.Exit(0)
+	}
+
 }
diff --git a/stack/stack.go b/stack/stack.go
index fd8e52a..2bbd2bf 100644
--- a/stack/stack.go
+++ b/stack/stack.go
@@ -26,6 +26,21 @@ func createStackInput(context *context.Context, template *string, stackName *str
 	return templateStruct
 }
 
+// This function gets template and  name of stack. It creates "CreateStackInput" structure.
+func updateStackInput(context *context.Context, template *string, stackName *string) cloudformation.UpdateStackInput {
+	rawCapabilities := *context.CliArguments.Capabilities
+	capabilities := make([]*string, len(rawCapabilities))
+	for i, capability := range rawCapabilities {
+		capabilities[i] = &capability
+	}
+	templateStruct := cloudformation.UpdateStackInput{
+		TemplateBody: template,
+		StackName:    stackName,
+		Capabilities: capabilities,
+	}
+	return templateStruct
+}
+
 // This function reads "StackName" from Stack in CliArguments and file from TemplatePath in CliArguments. It converts these to type string.
 func getTemplateFromFile(context *context.Context) (string, string) {
 
@@ -70,6 +85,23 @@ func DestroyStack(context *context.Context) {
 	}
 }
 
+func UpdateStack(context *context.Context) {
+	template, stackName := getTemplateFromFile(context)
+	templateStruct := updateStackInput(context, &template, &stackName)
+	session := mysession.InitializeSession(context)
+	err := updateStack(templateStruct, session)
+	if err != nil {
+		context.Logger.Error(err.Error())
+		os.Exit(1)
+	}
+}
+
+func updateStack(updateStackInput cloudformation.UpdateStackInput, session *session.Session) error {
+	api := cloudformation.New(session)
+	_, err := api.UpdateStack(&updateStackInput)
+	return err
+}
+
 // This function gets "StackName" from Stack in CliArguments and creates "DeleteStackInput" structure.
 func deleteStackInput(context *context.Context) cloudformation.DeleteStackInput {
 	name := *context.CliArguments.Stack