diff --git a/README.rst b/README.rst
index bb839a5..b42a1c7 100644
--- a/README.rst
+++ b/README.rst
@@ -1,5 +1,5 @@
 ==============================
-Welcome to ScanWatch 0.1.2
+Welcome to ScanWatch 0.1.3
 ==============================
 
 Note
@@ -18,6 +18,13 @@ This library is a local tracker of transactions for the Ethereum chain and the B
 It is a simple interface with the `etherscan <https://etherscan.io>`_ and the
 `bscscan <https://bscscan.com>`_ APIs and will save locally the results to gain time and avoid over-calling the APIs.
 
+Announcement
+------------
+
+If you previously used this library with a version inferior to 0.1.3,
+please head `here <https://github.com/EtWnn/ScanWatch/discussions/25>`_ to correct a potential bug in the database.
+
+
 Quick Tour
 ----------
 
@@ -44,7 +51,7 @@ Example for Ethereum:
 
 .. code:: python
 
-    from ScanWatch import ScanManager
+    from ScanWatch.ScanManager import ScanManager
     from ScanWatch.utils.enums import NETWORK
 
     api_token = "<ETH_API_TOKEN>"
@@ -56,7 +63,7 @@ Example for BSC:
 
 .. code:: python
 
-    from ScanWatch import ScanManager
+    from ScanWatch.ScanManager import ScanManager
     from ScanWatch.utils.enums import NETWORK
 
     api_token = "<BSC_API_TOKEN>"
diff --git a/ScanWatch/__init__.py b/ScanWatch/__init__.py
index b828470..70f87e3 100644
--- a/ScanWatch/__init__.py
+++ b/ScanWatch/__init__.py
@@ -1,4 +1,2 @@
 __author__ = 'EtWnn'
-__version__ = '0.1.2'
-
-from ScanWatch.ScanManager import ScanManager
+__version__ = '0.1.3'
diff --git a/ScanWatch/storage/ScanDataBase.py b/ScanWatch/storage/ScanDataBase.py
index b3f22d5..a8fca12 100644
--- a/ScanWatch/storage/ScanDataBase.py
+++ b/ScanWatch/storage/ScanDataBase.py
@@ -78,16 +78,13 @@ def get_last_block_number(self, address: str, nt_type: NETWORK, net: str, tr_typ
         :rtype: int
         """
         table = get_transaction_table(address, nt_type, net, tr_type)
-        selection = f"MAX({table.blockNumber})"
-        result = self.get_conditions_rows(table, selection=selection)
+        selection = str(table.blockNumber)
+        query = self.get_conditions_rows(table, selection=selection)
         default = 0
         try:
-            result = result[0][0]
-        except IndexError:
+            return max([int(e[0]) for e in query])
+        except ValueError:
             return default
-        if result is None:
-            return default
-        return int(result)
 
 
 
diff --git a/requirements-dev.txt b/requirements-dev.txt
new file mode 100644
index 0000000..9f8a77a
--- /dev/null
+++ b/requirements-dev.txt
@@ -0,0 +1,4 @@
+setuptools~=58.0.4
+sphinx~=4.3.2
+sphinx_rtd_theme~=1.0.0
+twine~=3.7.1
\ No newline at end of file
diff --git a/requirements.txt b/requirements.txt
index 2802d1d..ce936c1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,3 @@
-requests
-appdirs
-tqdm
-sphinx
-sphinx_rtd_theme
-twine
\ No newline at end of file
+appdirs~=1.4.4
+requests~=2.26.0
+tqdm~=4.62.3
\ No newline at end of file
diff --git a/setup.py b/setup.py
index 260ba2b..fec7799 100644
--- a/setup.py
+++ b/setup.py
@@ -10,18 +10,22 @@
 with open(os.path.join(this_directory, 'ScanWatch/__init__.py'), encoding='utf-8') as f:
     exec(f.read(), about)
 
+with open("requirements.txt") as file:
+    requirements_content = file.read()
+requirements = requirements_content.split('\n')
+
 setup(
     name='ScanWatch',
     version=about['__version__'],
     packages=['ScanWatch', 'ScanWatch.storage', 'ScanWatch.utils'],
     url='https://github.com/EtWnn/ScanWatch',
     author='EtWnn',
-    author_email='',
+    author_email='EtWnn0x@gmail.com',
     license='MIT',
     description='Local tracker of an eth address for ETH and BSC scan',
     long_description=long_description,
     long_description_content_type='text/x-rst',
-    install_requires=['requests', 'appdirs', 'tqdm'],
+    install_requires=requirements,
     keywords='eth bsc wallet save tracking history ethereum tracker binance smartchain smart chain',
     classifiers=[
         'Intended Audience :: Developers',