diff --git a/setup.py b/setup.py
index 518fda1..addbe08 100644
--- a/setup.py
+++ b/setup.py
@@ -19,9 +19,9 @@
     classifiers=['Programming Language :: Python :: 3 :: Only'],
     py_modules=['target_postgres'],
     install_requires=[
-        'arrow==0.15.5',
-        'psycopg2==2.8.5',
-        'singer-python==5.9.0'
+        'arrow==1.2.3',
+        'psycopg2==2.9.5',
+        'singer-python==5.13.0'
     ],
     setup_requires=[
         "pytest-runner"
diff --git a/target_postgres/singer_stream.py b/target_postgres/singer_stream.py
index 871d1c2..ba2b5fc 100644
--- a/target_postgres/singer_stream.py
+++ b/target_postgres/singer_stream.py
@@ -72,7 +72,7 @@ def update_schema(self, schema, key_properties):
         # The validator can handle _many_ more things than our simplified schema, and is, in general handled by third party code
         self.validator = Draft4Validator(schema, format_checker=FormatChecker())
 
-        properties = self.schema['properties']
+        properties = self.schema.get('properties', {})
 
         if singer.RECEIVED_AT not in properties:
             properties[singer.RECEIVED_AT] = {
@@ -182,7 +182,7 @@ def get_batch(self):
             if 'sequence' in record_message:
                 record[singer.SEQUENCE] = record_message['sequence']
             else:
-                record[singer.SEQUENCE] = arrow.get().timestamp
+                record[singer.SEQUENCE] = int(arrow.get().timestamp())
 
             records.append(record)