diff --git a/poetry.lock b/poetry.lock
index c1577435..1200d93a 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -6,6 +6,14 @@ category = "dev"
 optional = false
 python-versions = "*"
 
+[[package]]
+name = "async-property"
+version = "0.2.1"
+description = "Python decorator for async properties."
+category = "main"
+optional = false
+python-versions = "*"
+
 [[package]]
 name = "async-timeout"
 version = "3.0.1"
@@ -21,7 +29,6 @@ description = "Atomic file writes."
 category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-marker = "sys_platform == \"win32\""
 
 [[package]]
 name = "attrs"
@@ -32,10 +39,10 @@ optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [package.extras]
-dev = ["coverage (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface", "furo", "sphinx", "pre-commit"]
+dev = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface", "furo", "sphinx", "pre-commit"]
 docs = ["furo", "sphinx", "zope.interface"]
-tests = ["coverage (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface"]
-tests_no_zope = ["coverage (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six"]
+tests = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface"]
+tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six"]
 
 [[package]]
 name = "babel"
@@ -71,7 +78,6 @@ description = "Cross-platform colored terminal text."
 category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-marker = "sys_platform == \"win32\""
 
 [[package]]
 name = "docutils"
@@ -81,6 +87,17 @@ category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
+[[package]]
+name = "greenlet"
+version = "1.0.0"
+description = "Lightweight in-process concurrent programming"
+category = "main"
+optional = false
+python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*"
+
+[package.extras]
+docs = ["sphinx"]
+
 [[package]]
 name = "idna"
 version = "2.10"
@@ -107,18 +124,18 @@ python-versions = "*"
 
 [[package]]
 name = "jinja2"
-version = "2.11.2"
+version = "2.11.3"
 description = "A very fast and expressive template engine."
 category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
-[package.extras]
-i18n = ["Babel (>=0.8)"]
-
 [package.dependencies]
 MarkupSafe = ">=0.23"
 
+[package.extras]
+i18n = ["Babel (>=0.8)"]
+
 [[package]]
 name = "markupsafe"
 version = "1.1.1"
@@ -129,7 +146,7 @@ python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*"
 
 [[package]]
 name = "packaging"
-version = "20.8"
+version = "20.9"
 description = "Core utilities for Python packages"
 category = "dev"
 optional = false
@@ -172,7 +189,7 @@ typing_extensions = ["typing-extensions (>=3.7.2)"]
 
 [[package]]
 name = "pygments"
-version = "2.7.4"
+version = "2.8.0"
 description = "Pygments is a syntax highlighting package written in Python."
 category = "dev"
 optional = false
@@ -188,25 +205,25 @@ python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
 
 [[package]]
 name = "pytest"
-version = "6.2.1"
+version = "6.2.2"
 description = "pytest: simple powerful testing with Python"
 category = "dev"
 optional = false
 python-versions = ">=3.6"
 
-[package.extras]
-testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "requests", "xmlschema"]
-
 [package.dependencies]
-atomicwrites = ">=1.0"
+atomicwrites = {version = ">=1.0", markers = "sys_platform == \"win32\""}
 attrs = ">=19.2.0"
-colorama = "*"
+colorama = {version = "*", markers = "sys_platform == \"win32\""}
 iniconfig = "*"
 packaging = "*"
 pluggy = ">=0.12,<1.0.0a1"
 py = ">=1.8.2"
 toml = "*"
 
+[package.extras]
+testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "requests", "xmlschema"]
+
 [[package]]
 name = "pytest-asyncio"
 version = "0.14.0"
@@ -215,15 +232,15 @@ category = "dev"
 optional = false
 python-versions = ">= 3.5"
 
-[package.extras]
-testing = ["async-generator (>=1.3)", "coverage", "hypothesis (>=5.7.1)"]
-
 [package.dependencies]
 pytest = ">=5.4.0"
 
+[package.extras]
+testing = ["async-generator (>=1.3)", "coverage", "hypothesis (>=5.7.1)"]
+
 [[package]]
 name = "pytz"
-version = "2020.5"
+version = "2021.1"
 description = "World timezone definitions, modern and historical"
 category = "dev"
 optional = false
@@ -237,16 +254,16 @@ category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
-[package.extras]
-security = ["pyOpenSSL (>=0.14)", "cryptography (>=1.3.4)"]
-socks = ["PySocks (>=1.5.6,<1.5.7 || >1.5.7)", "win-inet-pton"]
-
 [package.dependencies]
 certifi = ">=2017.4.17"
 chardet = ">=3.0.2,<5"
 idna = ">=2.5,<3"
 urllib3 = ">=1.21.1,<1.27"
 
+[package.extras]
+security = ["pyOpenSSL (>=0.14)", "cryptography (>=1.3.4)"]
+socks = ["PySocks (>=1.5.6,!=1.5.7)", "win-inet-pton"]
+
 [[package]]
 name = "snowballstemmer"
 version = "2.1.0"
@@ -257,28 +274,22 @@ python-versions = "*"
 
 [[package]]
 name = "sphinx"
-version = "3.4.3"
+version = "3.5.1"
 description = "Python documentation generator"
 category = "dev"
 optional = false
 python-versions = ">=3.5"
 
-[package.extras]
-docs = ["sphinxcontrib-websupport"]
-lint = ["flake8 (>=3.5.0)", "isort", "mypy (>=0.790)", "docutils-stubs"]
-test = ["pytest", "pytest-cov", "html5lib", "cython", "typed-ast"]
-
 [package.dependencies]
 alabaster = ">=0.7,<0.8"
 babel = ">=1.3"
-colorama = ">=0.3.5"
+colorama = {version = ">=0.3.5", markers = "sys_platform == \"win32\""}
 docutils = ">=0.12"
 imagesize = "*"
 Jinja2 = ">=2.3"
 packaging = "*"
 Pygments = ">=2.0"
 requests = ">=2.5.0"
-setuptools = "*"
 snowballstemmer = ">=1.1"
 sphinxcontrib-applehelp = "*"
 sphinxcontrib-devhelp = "*"
@@ -287,6 +298,11 @@ sphinxcontrib-jsmath = "*"
 sphinxcontrib-qthelp = "*"
 sphinxcontrib-serializinghtml = "*"
 
+[package.extras]
+docs = ["sphinxcontrib-websupport"]
+lint = ["flake8 (>=3.5.0)", "isort", "mypy (>=0.800)", "docutils-stubs"]
+test = ["pytest", "pytest-cov", "html5lib", "cython", "typed-ast"]
+
 [[package]]
 name = "sphinx-rtd-theme"
 version = "0.5.1"
@@ -295,12 +311,12 @@ category = "dev"
 optional = false
 python-versions = "*"
 
-[package.extras]
-dev = ["transifex-client", "sphinxcontrib-httpdomain", "bump2version"]
-
 [package.dependencies]
 sphinx = "*"
 
+[package.extras]
+dev = ["transifex-client", "sphinxcontrib-httpdomain", "bump2version"]
+
 [[package]]
 name = "sphinxcontrib-applehelp"
 version = "1.0.2"
@@ -374,23 +390,31 @@ test = ["pytest"]
 
 [[package]]
 name = "sqlalchemy"
-version = "1.3.22"
+version = "1.4.0b3"
 description = "Database Abstraction Library"
 category = "main"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,>=2.7"
+
+[package.dependencies]
+greenlet = {version = "!=0.4.17", markers = "python_version >= \"3\""}
 
 [package.extras]
+aiomysql = ["greenlet (!=0.4.17)", "aiomysql"]
+asyncio = ["greenlet (!=0.4.17)"]
+mariadb_connector = ["mariadb (>=1.0.1)"]
 mssql = ["pyodbc"]
 mssql_pymssql = ["pymssql"]
 mssql_pyodbc = ["pyodbc"]
-mysql = ["mysqlclient"]
-oracle = ["cx-oracle"]
-postgresql = ["psycopg2"]
-postgresql_pg8000 = ["pg8000"]
+mysql = ["mysqlclient (>=1.4.0,<2)", "mysqlclient (>=1.4.0)"]
+mysql_connector = ["mysqlconnector"]
+oracle = ["cx_oracle (>=7,<8)", "cx_oracle (>=7)"]
+postgresql = ["psycopg2 (>=2.7)"]
+postgresql_asyncpg = ["greenlet (!=0.4.17)", "asyncpg"]
+postgresql_pg8000 = ["pg8000 (>=1.16.6)"]
 postgresql_psycopg2binary = ["psycopg2-binary"]
 postgresql_psycopg2cffi = ["psycopg2cffi"]
-pymysql = ["pymysql"]
+pymysql = ["pymysql (<1)", "pymysql"]
 
 [[package]]
 name = "toml"
@@ -402,7 +426,7 @@ python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
 
 [[package]]
 name = "urllib3"
-version = "1.26.2"
+version = "1.26.3"
 description = "HTTP library with thread-safe connection pooling, file post, and more."
 category = "dev"
 optional = false
@@ -411,18 +435,22 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4"
 [package.extras]
 brotli = ["brotlipy (>=0.6.0)"]
 secure = ["pyOpenSSL (>=0.14)", "cryptography (>=1.3.4)", "idna (>=2.0.0)", "certifi", "ipaddress"]
-socks = ["PySocks (>=1.5.6,<1.5.7 || >1.5.7,<2.0)"]
+socks = ["PySocks (>=1.5.6,!=1.5.7,<2.0)"]
 
 [metadata]
-lock-version = "1.0"
+lock-version = "1.1"
 python-versions = "^3.8"
-content-hash = "e53fe1488633a7fa98cd473258ed6501d33201c07c0169b0a13a5f8f38149ac4"
+content-hash = "78e9c36a8526d4f6ea5b4d0b92cb62fe601803a5b4be5a0f12fcac177f56c568"
 
 [metadata.files]
 alabaster = [
     {file = "alabaster-0.7.12-py2.py3-none-any.whl", hash = "sha256:446438bdcca0e05bd45ea2de1668c1d9b032e1a9154c2c259092d77031ddd359"},
     {file = "alabaster-0.7.12.tar.gz", hash = "sha256:a661d72d58e6ea8a57f7a86e37d86716863ee5e92788398526d58b26a4e4dc02"},
 ]
+async-property = [
+    {file = "async_property-0.2.1-py2.py3-none-any.whl", hash = "sha256:f1f105009a6216ed9a13031aa13632754ed8a5c2e329fb8f9f2082d83529eacd"},
+    {file = "async_property-0.2.1.tar.gz", hash = "sha256:53826fd45a67d7d6cca3d7abbc0e8ba951f7c7618c830021fbd3675979b0b67d"},
+]
 async-timeout = [
     {file = "async-timeout-3.0.1.tar.gz", hash = "sha256:0c3c816a028d47f659d6ff5c745cb2acf1f966da1fe5c19c77a70282b25f4c5f"},
     {file = "async_timeout-3.0.1-py3-none-any.whl", hash = "sha256:4291ca197d287d274d0b6cb5d6f8f8f82d434ed288f962539ff18cc9012f9ea3"},
@@ -455,6 +483,51 @@ docutils = [
     {file = "docutils-0.16-py2.py3-none-any.whl", hash = "sha256:0c5b78adfbf7762415433f5515cd5c9e762339e23369dbe8000d84a4bf4ab3af"},
     {file = "docutils-0.16.tar.gz", hash = "sha256:c2de3a60e9e7d07be26b7f2b00ca0309c207e06c100f9cc2a94931fc75a478fc"},
 ]
+greenlet = [
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 ]
diff --git a/pyproject.toml b/pyproject.toml
index 6835e353..689da33e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -20,14 +20,15 @@ classifiers = [
 
 [tool.poetry.dependencies]
 python = "^3.8"
-sqlalchemy = "^1.3.19"
+sqlalchemy = "^1.4.0b3"
 toml = "^0.10.1"
 pydantic = "^1.7.3"
+async-property = "^0.2.1"
 
 [tool.poetry.dev-dependencies]
-pytest = "^6.1.1"
+pytest = "^6.2.2"
 pytest-asyncio = "^0.14.0"
-sphinx = "^3.3.1"
+sphinx = "^3.5.1"
 sphinx_rtd_theme = "^0.5.0"
 async-timeout = "^3.0.1"