diff --git a/translator/toscalib/common/exception.py b/translator/toscalib/common/exception.py
index 7cc956f..2a1e8d2 100644
--- a/translator/toscalib/common/exception.py
+++ b/translator/toscalib/common/exception.py
@@ -89,3 +89,8 @@ class UnknownInputError(TOSCAException):
 
 class InvalidPropertyValueError(TOSCAException):
     msg_fmt = _('Value of property "%(what)s" is invalid.')
+
+
+class InvalidTemplateVersion(TOSCAException):
+    msg_fmt = _('The template version "%(what)s" is invalid. '
+                'The valid versions are: "%(valid_versions)s"')
diff --git a/translator/toscalib/tests/data/test_invalid_template_version.yaml b/translator/toscalib/tests/data/test_invalid_template_version.yaml
new file mode 100644
index 0000000..2011f8f
--- /dev/null
+++ b/translator/toscalib/tests/data/test_invalid_template_version.yaml
@@ -0,0 +1,11 @@
+tosca_definitions_version: tosca_xyz
+
+description: >
+    Test template with an invalid template version.
+
+node_templates:
+  server:
+    type: tosca.nodes.Compute
+    properties:
+      os_type: Linux
+      num_cpus: 2
\ No newline at end of file
diff --git a/translator/toscalib/tests/test_toscatplvalidation.py b/translator/toscalib/tests/test_toscatplvalidation.py
index 7b8f86d..aaab6ab 100644
--- a/translator/toscalib/tests/test_toscatplvalidation.py
+++ b/translator/toscalib/tests/test_toscatplvalidation.py
@@ -13,6 +13,7 @@
 import os
 import six
 
+from translator.toscalib.common.exception import InvalidTemplateVersion
 from translator.toscalib.common.exception import InvalidTypeError
 from translator.toscalib.common.exception import MissingRequiredFieldError
 from translator.toscalib.common.exception import TypeMismatchError
@@ -430,3 +431,14 @@ class ToscaTemplateValidationTest(TestCase):
         rel_template = RelationshipTemplate(rel_template[name], name)
         err = self.assertRaises(expectederror, rel_template.validate)
         self.assertEqual(expectedmessage, six.text_type(err))
+
+    def test_invalid_template_version(self):
+        tosca_tpl = os.path.join(
+            os.path.dirname(os.path.abspath(__file__)),
+            "data/test_invalid_template_version.yaml")
+        err = self.assertRaises(InvalidTemplateVersion, ToscaTemplate,
+                                tosca_tpl)
+        valid_versions = ', '.join(ToscaTemplate.VALID_TEMPLATE_VERSIONS)
+        ex_err_msg = ('The template version "tosca_xyz" is invalid. '
+                      'The valid versions are: "%s"' % valid_versions)
+        self.assertEqual(six.text_type(err), ex_err_msg)
diff --git a/translator/toscalib/tosca_template.py b/translator/toscalib/tosca_template.py
index f231eb2..4cd2ccb 100644
--- a/translator/toscalib/tosca_template.py
+++ b/translator/toscalib/tosca_template.py
@@ -14,6 +14,7 @@
 import logging
 import os
 
+from translator.toscalib.common.exception import InvalidTemplateVersion
 from translator.toscalib.common.exception import MissingRequiredFieldError
 from translator.toscalib.common.exception import UnknownFieldError
 from translator.toscalib import functions
@@ -44,6 +45,9 @@ YAML_LOADER = translator.toscalib.utils.yamlparser.load_yaml
 
 
 class ToscaTemplate(object):
+
+    VALID_TEMPLATE_VERSIONS = ['tosca_simple_yaml_1_0_0']
+
     '''Load the template data.'''
     def __init__(self, path):
         self.tpl = YAML_LOADER(path)
@@ -151,7 +155,8 @@ class ToscaTemplate(object):
 
     def _validate_field(self):
         try:
-            self._tpl_version()
+            version = self._tpl_version()
+            self._validate_version(version)
         except KeyError:
             raise MissingRequiredFieldError(what='Template',
                                             required=DEFINITION_VERSION)
@@ -190,3 +195,9 @@ class ToscaTemplate(object):
             func = functions.get_function(self, self.outputs, output.value)
             if isinstance(func, functions.GetAttribute):
                 output.attrs[output.VALUE] = func
+
+    def _validate_version(self, version):
+        if version not in self.VALID_TEMPLATE_VERSIONS:
+            raise InvalidTemplateVersion(
+                what=version,
+                valid_versions=', '. join(self.VALID_TEMPLATE_VERSIONS))