diff --git a/poetry.lock b/poetry.lock
index 1640400..c94797d 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -17,6 +17,7 @@ version = "1.4.3"
 [[package]]
 category = "dev"
 description = "Atomic file writes."
+marker = "sys_platform == \"win32\""
 name = "atomicwrites"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
@@ -212,17 +213,17 @@ category = "dev"
 description = "A library for property-based testing"
 name = "hypothesis"
 optional = false
-python-versions = ">=3.5"
-version = "5.1.0"
+python-versions = ">=3.5.2"
+version = "5.12.0"
 
 [package.dependencies]
 attrs = ">=19.2.0"
 sortedcontainers = ">=2.1.0,<3.0.0"
 
 [package.extras]
-all = ["django (>=1.11)", "dpcontracts (>=0.4)", "lark-parser (>=0.6.5)", "numpy (>=1.9.0)", "pandas (>=0.19)", "pytest (>=4.3)", "python-dateutil (>=1.4)", "pytz (>=2014.1)"]
+all = ["django (>=2.2)", "dpcontracts (>=0.4)", "lark-parser (>=0.6.5)", "numpy (>=1.9.0)", "pandas (>=0.19)", "pytest (>=4.3)", "python-dateutil (>=1.4)", "pytz (>=2014.1)"]
 dateutil = ["python-dateutil (>=1.4)"]
-django = ["pytz (>=2014.1)", "django (>=1.11)"]
+django = ["pytz (>=2014.1)", "django (>=2.2)"]
 dpcontracts = ["dpcontracts (>=0.4)"]
 lark = ["lark-parser (>=0.6.5)"]
 numpy = ["numpy (>=1.9.0)"]
@@ -459,7 +460,7 @@ testing = ["fields", "hunter", "process-tests (2.0.2)", "six", "virtualenv"]
 category = "main"
 description = "World timezone definitions, modern and historical"
 name = "pytz"
-optional = false
+optional = true
 python-versions = "*"
 version = "2020.1"
 
@@ -720,7 +721,7 @@ testing = ["jaraco.itertools", "func-timeout"]
 docs = ["sphinx", "sphinx-autodoc-typehints", "toml"]
 
 [metadata]
-content-hash = "05f265b48d0a7cf0efcfbe2fcc29c95482fa4a5f147c75191d1ece66b19b4773"
+content-hash = "6e090abeea78c0005ca1a79841932d6ff2683949563b814a66f3ee3b84a54221"
 python-versions = ">= 3.6"
 
 [metadata.files]
@@ -841,8 +842,8 @@ gitpython = [
     {file = "GitPython-3.1.1.tar.gz", hash = "sha256:6d4f10e2aaad1864bb0f17ec06a2c2831534140e5883c350d58b4e85189dab74"},
 ]
 hypothesis = [
-    {file = "hypothesis-5.1.0-py3-none-any.whl", hash = "sha256:6abd5740ed05dff9efe0df18f0f7013eb4aa99c143f7177fbefb603888a990d0"},
-    {file = "hypothesis-5.1.0.tar.gz", hash = "sha256:1b03916e72265655378c5e67f27663adb1e6175fe1ad906d58997b7a04ce99ad"},
+    {file = "hypothesis-5.12.0-py3-none-any.whl", hash = "sha256:bf1f3a6bcd7a484b3646f35dca17a962412f536de516b6ee3eac8d9d251d971e"},
+    {file = "hypothesis-5.12.0.tar.gz", hash = "sha256:df8bc0071838e98cdf205a340e29f217ba98f20ab53a11290b8fb0e33c1619b2"},
 ]
 idna = [
     {file = "idna-2.9-py2.py3-none-any.whl", hash = "sha256:a068a21ceac8a4d63dbfd964670474107f541babbd2250d61922f029858365fa"},
diff --git a/pyproject.toml b/pyproject.toml
index 62ce033..e41a86b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -33,7 +33,7 @@ toml = { version = "^0.10.0", optional = true }
 
 [tool.poetry.dev-dependencies]
 pytest = "^5.4"
-hypothesis = "^5.1"
+hypothesis = "^5.12"
 isort = "^4.3"
 flake8 = "^3.7"
 black = "^19.3b0"