diff --git a/CHANGELOG.md b/CHANGELOG.md
index 23db51c..eff83cc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## 0.19.0 : 12.07.2021
+
+- **Feature**: `FieldList` and `FormFieldList` now supports optional min/max constrains using `min_length`/`max_length`
+
 ## 0.18.0 : 16.04.2021
 
 - **Feature**: `ModelForm` class introduced (experimental, initial support - not recommended for production)
diff --git a/README.md b/README.md
index 594a84f..19f9589 100644
--- a/README.md
+++ b/README.md
@@ -205,4 +205,5 @@ Especially, I have to recommend their database design tool. Many thanks [Navicat
 supporting Open Source projects 🌈.
 
 ---
-Made with ❤️ and ☕️ by Jakub Dubec & [BACKBONE s.r.o.](https://www.backbone.sk/en/)
+Made with ❤️ and ☕️ by Jakub Dubec, [BACKBONE s.r.o.](https://www.backbone.sk/en/) &
+[contributors](https://github.com/Sibyx/django_api_forms/graphs/contributors).
diff --git a/django_api_forms/fields.py b/django_api_forms/fields.py
index 03e61f2..599a7ad 100644
--- a/django_api_forms/fields.py
+++ b/django_api_forms/fields.py
@@ -41,7 +41,7 @@ def has_changed(self, initial, data):
 class FieldList(Field):
     default_error_messages = {
         'max_length': _('Ensure this list has at most %(max)d values (it has %(length)d).'),
-        'min_length': _('Ensure this list has at least %(max)d values (it has %(length)d).'),
+        'min_length': _('Ensure this list has at least %(min)d values (it has %(length)d).'),
         'not_field': _('Invalid Field type passed into FieldList!'),
         'not_list': _('This field needs to be a list of objects!'),
     }
@@ -64,7 +64,7 @@ def to_python(self, value) -> typing.List:
             raise ValidationError(self.error_messages['not_list'], code='not_list')
 
         if self._min_length is not None and len(value) < self._min_length:
-            params = {'max': self._min_length, 'length': len(value)}
+            params = {'min': self._min_length, 'length': len(value)}
             raise ValidationError(self.error_messages['min_length'], code='min_length', params=params)
 
         if self._max_length is not None and len(value) > self._max_length:
@@ -116,7 +116,7 @@ def __init__(self, form: typing.Type, min_length=None, max_length=None, **kwargs
 
     default_error_messages = {
         'max_length': _('Ensure this list has at most %(max)d values (it has %(length)d).'),
-        'min_length': _('Ensure this list has at least %(max)d values (it has %(length)d).'),
+        'min_length': _('Ensure this list has at least %(min)d values (it has %(length)d).'),
         'not_list': _('This field needs to be a list of objects!')
     }
 
@@ -128,7 +128,7 @@ def to_python(self, value):
             raise ValidationError(self.error_messages['not_list'], code='not_list')
 
         if self._min_length is not None and len(value) < self._min_length:
-            params = {'max': self._min_length, 'length': len(value)}
+            params = {'min': self._min_length, 'length': len(value)}
             raise ValidationError(self.error_messages['min_length'], code='min_length', params=params)
 
         if self._max_length is not None and len(value) > self._max_length:
diff --git a/django_api_forms/version.py b/django_api_forms/version.py
index 5ec52a9..482e4a1 100644
--- a/django_api_forms/version.py
+++ b/django_api_forms/version.py
@@ -1 +1 @@
-__version__ = '0.18.0'
+__version__ = '0.19.0'
diff --git a/docs/fields.md b/docs/fields.md
index 197b2c6..04b2382 100644
--- a/docs/fields.md
+++ b/docs/fields.md
@@ -62,8 +62,9 @@ check `FormFieldList`.
 - Error message keys: `not_field`, `not_list`, `min_length`, `max_length`
 - Required arguments:
     - `field`: Instance of a form field representing children
-    - `min_length`: Minimum length of field size in integer (optional)
-    - `max_length`: Maximum length of field size in integer (optional)
+- Optional arguments:
+    - `min_length`: Minimum length of field size as integer
+    - `max_length`: Maximum length of field size as integer
 
 **JSON example**
 
@@ -135,8 +136,9 @@ Field used for embedded objects represented as another API form.
 - Error message keys: `not_list`, `min_length`, `max_length`
 - Required arguments:
     - `form`: Type of a nested form
-    - `min_length`: Minimum length of field size in integer (optional)
-    - `max_length`: Maximum length of field size in integer (optional)
+- Optional arguments:
+    - `min_length`: Minimum length of field size as integer
+    - `max_length`: Maximum length of field size as integer
 
 **JSON example**
 
diff --git a/poetry.lock b/poetry.lock
index bd5c11f..b340dcf 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,6 +1,6 @@
 [[package]]
 name = "asgiref"
-version = "3.3.4"
+version = "3.4.1"
 description = "ASGI specs, helper code, and adapters"
 category = "main"
 optional = false
@@ -22,17 +22,17 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [[package]]
 name = "attrs"
-version = "20.3.0"
+version = "21.2.0"
 description = "Classes Without Boilerplate"
 category = "dev"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [package.extras]
-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[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"]
+dev = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins", "zope.interface", "furo", "sphinx", "sphinx-notfound-page", "pre-commit"]
+docs = ["furo", "sphinx", "zope.interface", "sphinx-notfound-page"]
+tests = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins", "zope.interface"]
+tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins"]
 
 [[package]]
 name = "bleach"
@@ -49,7 +49,7 @@ webencodings = "*"
 
 [[package]]
 name = "certifi"
-version = "2020.12.5"
+version = "2021.5.30"
 description = "Python package for providing Mozilla's CA Bundle."
 category = "dev"
 optional = false
@@ -57,7 +57,7 @@ python-versions = "*"
 
 [[package]]
 name = "cffi"
-version = "1.14.5"
+version = "1.14.6"
 description = "Foreign Function Interface for Python calling C code."
 category = "dev"
 optional = false
@@ -76,17 +76,21 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [[package]]
 name = "click"
-version = "7.1.2"
+version = "8.0.1"
 description = "Composable command line interface toolkit"
 category = "main"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+python-versions = ">=3.6"
+
+[package.dependencies]
+colorama = {version = "*", markers = "platform_system == \"Windows\""}
+importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
 
 [[package]]
 name = "colorama"
 version = "0.4.4"
 description = "Cross-platform colored terminal text."
-category = "dev"
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
@@ -122,7 +126,7 @@ test = ["pytest (>=6.0)", "pytest-cov", "pytest-subtests", "pytest-xdist", "pret
 
 [[package]]
 name = "django"
-version = "3.2.1"
+version = "3.2.5"
 description = "A high-level Python Web framework that encourages rapid development and clean, pragmatic design."
 category = "main"
 optional = false
@@ -147,7 +151,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [[package]]
 name = "flake8"
-version = "3.9.1"
+version = "3.9.2"
 description = "the modular source code checker: pep8 pyflakes and co"
 category = "dev"
 optional = false
@@ -160,12 +164,18 @@ pycodestyle = ">=2.7.0,<2.8.0"
 pyflakes = ">=2.3.0,<2.4.0"
 
 [[package]]
-name = "future"
-version = "0.18.2"
-description = "Clean single-source support for Python 3 and 2"
+name = "ghp-import"
+version = "2.0.1"
+description = "Copy your docs directly to the gh-pages branch."
 category = "main"
 optional = false
-python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
+python-versions = "*"
+
+[package.dependencies]
+python-dateutil = ">=2.8.1"
+
+[package.extras]
+dev = ["twine", "markdown", "flake8"]
 
 [[package]]
 name = "idna"
@@ -177,7 +187,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [[package]]
 name = "importlib-metadata"
-version = "4.0.1"
+version = "4.6.1"
 description = "Read metadata from Python packages"
 category = "main"
 optional = false
@@ -189,7 +199,8 @@ zipp = ">=0.5"
 
 [package.extras]
 docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)"]
-testing = ["pytest (>=4.6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.0.1)", "packaging", "pep517", "pyfakefs", "flufl.flake8", "pytest-black (>=0.3.7)", "pytest-mypy", "importlib-resources (>=1.3)"]
+perf = ["ipython"]
+testing = ["pytest (>=4.6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.0.1)", "packaging", "pep517", "pyfakefs", "flufl.flake8", "pytest-perf (>=0.9.2)", "pytest-black (>=0.3.7)", "pytest-mypy", "importlib-resources (>=1.3)"]
 
 [[package]]
 name = "iniconfig"
@@ -201,7 +212,7 @@ python-versions = "*"
 
 [[package]]
 name = "jeepney"
-version = "0.6.0"
+version = "0.7.0"
 description = "Low-level, pure Python DBus protocol wrapper."
 category = "dev"
 optional = false
@@ -209,28 +220,21 @@ python-versions = ">=3.6"
 
 [package.extras]
 test = ["pytest", "pytest-trio", "pytest-asyncio", "testpath", "trio"]
+trio = ["trio", "async-generator"]
 
 [[package]]
 name = "jinja2"
-version = "2.11.3"
+version = "3.0.1"
 description = "A very fast and expressive template engine."
 category = "main"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+python-versions = ">=3.6"
 
 [package.dependencies]
-MarkupSafe = ">=0.23"
+MarkupSafe = ">=2.0"
 
 [package.extras]
-i18n = ["Babel (>=0.8)"]
-
-[[package]]
-name = "joblib"
-version = "1.0.1"
-description = "Lightweight pipelining with Python functions"
-category = "main"
-optional = false
-python-versions = ">=3.6"
+i18n = ["Babel (>=2.7)"]
 
 [[package]]
 name = "keyring"
@@ -250,34 +254,6 @@ SecretStorage = {version = ">=3.2", markers = "sys_platform == \"linux\""}
 docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)"]
 testing = ["pytest (>=4.6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.0.1)", "pytest-black (>=0.3.7)", "pytest-mypy"]
 
-[[package]]
-name = "livereload"
-version = "2.6.3"
-description = "Python LiveReload is an awesome tool for web developers"
-category = "main"
-optional = false
-python-versions = "*"
-
-[package.dependencies]
-six = "*"
-tornado = {version = "*", markers = "python_version > \"2.7\""}
-
-[[package]]
-name = "lunr"
-version = "0.5.8"
-description = "A Python implementation of Lunr.js"
-category = "main"
-optional = false
-python-versions = "*"
-
-[package.dependencies]
-future = ">=0.16.0"
-nltk = {version = ">=3.2.5", optional = true, markers = "python_version > \"2.7\" and extra == \"languages\""}
-six = ">=1.11.0"
-
-[package.extras]
-languages = ["nltk (>=3.2.5,<3.5)", "nltk (>=3.2.5)"]
-
 [[package]]
 name = "markdown"
 version = "3.3.4"
@@ -294,11 +270,11 @@ testing = ["coverage", "pyyaml"]
 
 [[package]]
 name = "markupsafe"
-version = "1.1.1"
+version = "2.0.1"
 description = "Safely add untrusted strings to HTML/XML markup."
 category = "main"
 optional = false
-python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*"
+python-versions = ">=3.6"
 
 [[package]]
 name = "mccabe"
@@ -308,26 +284,40 @@ category = "dev"
 optional = false
 python-versions = "*"
 
+[[package]]
+name = "mergedeep"
+version = "1.3.4"
+description = "A deep merge function for 🐍."
+category = "main"
+optional = false
+python-versions = ">=3.6"
+
 [[package]]
 name = "mkdocs"
-version = "1.1.2"
+version = "1.2.1"
 description = "Project documentation with Markdown."
 category = "main"
 optional = false
-python-versions = ">=3.5"
+python-versions = ">=3.6"
 
 [package.dependencies]
 click = ">=3.3"
+ghp-import = ">=1.0"
+importlib-metadata = ">=3.10"
 Jinja2 = ">=2.10.1"
-livereload = ">=2.5.1"
-lunr = {version = "0.5.8", extras = ["languages"]}
 Markdown = ">=3.2.1"
+mergedeep = ">=1.3.4"
+packaging = ">=20.5"
 PyYAML = ">=3.10"
-tornado = ">=5.0"
+pyyaml-env-tag = ">=0.1"
+watchdog = ">=2.0"
+
+[package.extras]
+i18n = ["babel (>=2.9.0)"]
 
 [[package]]
 name = "mkdocs-material"
-version = "7.1.3"
+version = "7.1.10"
 description = "A Material Design theme for MkDocs"
 category = "main"
 optional = false
@@ -359,42 +349,20 @@ category = "main"
 optional = false
 python-versions = "*"
 
-[[package]]
-name = "nltk"
-version = "3.6.2"
-description = "Natural Language Toolkit"
-category = "main"
-optional = false
-python-versions = ">=3.5.*"
-
-[package.dependencies]
-click = "*"
-joblib = "*"
-regex = "*"
-tqdm = "*"
-
-[package.extras]
-all = ["matplotlib", "twython", "scipy", "numpy", "gensim (<4.0.0)", "python-crfsuite", "pyparsing", "scikit-learn", "requests"]
-corenlp = ["requests"]
-machine_learning = ["gensim (<4.0.0)", "numpy", "python-crfsuite", "scikit-learn", "scipy"]
-plot = ["matplotlib"]
-tgrep = ["pyparsing"]
-twitter = ["twython"]
-
 [[package]]
 name = "packaging"
-version = "20.9"
+version = "21.0"
 description = "Core utilities for Python packages"
-category = "dev"
+category = "main"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+python-versions = ">=3.6"
 
 [package.dependencies]
 pyparsing = ">=2.0.2"
 
 [[package]]
 name = "pillow"
-version = "8.2.0"
+version = "8.3.1"
 description = "Python Imaging Library (Fork)"
 category = "main"
 optional = false
@@ -402,7 +370,7 @@ python-versions = ">=3.6"
 
 [[package]]
 name = "pkginfo"
-version = "1.7.0"
+version = "1.7.1"
 description = "Query metadatdata from sdists / bdists / installed packages."
 category = "dev"
 optional = false
@@ -467,7 +435,7 @@ python-versions = ">=3.5"
 
 [[package]]
 name = "pymdown-extensions"
-version = "8.1.1"
+version = "8.2"
 description = "Extension pack for Python Markdown."
 category = "main"
 optional = false
@@ -480,13 +448,13 @@ Markdown = ">=3.2"
 name = "pyparsing"
 version = "2.4.7"
 description = "Python parsing module"
-category = "dev"
+category = "main"
 optional = false
 python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
 
 [[package]]
 name = "pytest"
-version = "6.2.3"
+version = "6.2.4"
 description = "pytest: simple powerful testing with Python"
 category = "dev"
 optional = false
@@ -508,7 +476,7 @@ testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "requests", "xm
 
 [[package]]
 name = "pytest-cov"
-version = "2.11.1"
+version = "2.12.1"
 description = "Pytest plugin for measuring coverage."
 category = "dev"
 optional = false
@@ -517,13 +485,14 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 [package.dependencies]
 coverage = ">=5.2.1"
 pytest = ">=4.6"
+toml = "*"
 
 [package.extras]
-testing = ["fields", "hunter", "process-tests (==2.0.2)", "six", "pytest-xdist", "virtualenv"]
+testing = ["fields", "hunter", "process-tests", "six", "pytest-xdist", "virtualenv"]
 
 [[package]]
 name = "pytest-django"
-version = "4.2.0"
+version = "4.4.0"
 description = "A Django plugin for pytest."
 category = "dev"
 optional = false
@@ -548,6 +517,17 @@ python-versions = "*"
 flake8 = ">=3.5"
 pytest = ">=3.5"
 
+[[package]]
+name = "python-dateutil"
+version = "2.8.1"
+description = "Extensions to the standard Python datetime module"
+category = "main"
+optional = false
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,>=2.7"
+
+[package.dependencies]
+six = ">=1.5"
+
 [[package]]
 name = "pytz"
 version = "2021.1"
@@ -572,6 +552,17 @@ category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*"
 
+[[package]]
+name = "pyyaml-env-tag"
+version = "0.1"
+description = "A custom YAML tag for referencing environment variables in YAML files. "
+category = "main"
+optional = false
+python-versions = ">=3.6"
+
+[package.dependencies]
+pyyaml = "*"
+
 [[package]]
 name = "readme-renderer"
 version = "29.0"
@@ -589,14 +580,6 @@ six = "*"
 [package.extras]
 md = ["cmarkgfm (>=0.5.0,<0.6.0)"]
 
-[[package]]
-name = "regex"
-version = "2021.4.4"
-description = "Alternative regular expression module, to replace re."
-category = "main"
-optional = false
-python-versions = "*"
-
 [[package]]
 name = "requests"
 version = "2.25.1"
@@ -628,7 +611,7 @@ requests = ">=2.0.1,<3.0.0"
 
 [[package]]
 name = "rfc3986"
-version = "1.4.0"
+version = "1.5.0"
 description = "Validating URI References per RFC 3986"
 category = "dev"
 optional = false
@@ -651,7 +634,7 @@ jeepney = ">=0.6"
 
 [[package]]
 name = "six"
-version = "1.15.0"
+version = "1.16.0"
 description = "Python 2 and 3 compatibility utilities"
 category = "main"
 optional = false
@@ -673,22 +656,17 @@ category = "dev"
 optional = false
 python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
 
-[[package]]
-name = "tornado"
-version = "6.1"
-description = "Tornado is a Python web framework and asynchronous networking library, originally developed at FriendFeed."
-category = "main"
-optional = false
-python-versions = ">= 3.5"
-
 [[package]]
 name = "tqdm"
-version = "4.60.0"
+version = "4.61.2"
 description = "Fast, Extensible Progress Meter"
-category = "main"
+category = "dev"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
 
+[package.dependencies]
+colorama = {version = "*", markers = "platform_system == \"Windows\""}
+
 [package.extras]
 dev = ["py-make (>=0.1.0)", "twine", "wheel"]
 notebook = ["ipywidgets (>=6)"]
@@ -723,16 +701,27 @@ python-versions = "*"
 
 [[package]]
 name = "urllib3"
-version = "1.26.4"
+version = "1.26.6"
 description = "HTTP library with thread-safe connection pooling, file post, and more."
 category = "dev"
 optional = false
 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,<2.0)"]
-brotli = ["brotlipy (>=0.6.0)"]
+
+[[package]]
+name = "watchdog"
+version = "2.1.3"
+description = "Filesystem events monitoring"
+category = "main"
+optional = false
+python-versions = ">=3.6"
+
+[package.extras]
+watchmedo = ["PyYAML (>=3.10)", "argh (>=0.24.1)"]
 
 [[package]]
 name = "webencodings"
@@ -744,7 +733,7 @@ python-versions = "*"
 
 [[package]]
 name = "zipp"
-version = "3.4.1"
+version = "3.5.0"
 description = "Backport of pathlib-compatible object wrapper for zip files"
 category = "main"
 optional = false
@@ -752,7 +741,7 @@ python-versions = ">=3.6"
 
 [package.extras]
 docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)"]
-testing = ["pytest (>=4.6)", "pytest-checkdocs (>=1.2.3)", "pytest-flake8", "pytest-cov", "pytest-enabler", "jaraco.itertools", "func-timeout", "pytest-black (>=0.3.7)", "pytest-mypy"]
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diff --git a/pyproject.toml b/pyproject.toml
index 958b3a3..0eef282 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "django-api-forms"
-version = "0.18.0"
+version = "0.19.0"
 description = "Declarative Django request validation"
 authors = ["Jakub Dubec <jakub.dubec@gmail.com>", "Paul Brown <paul90brown+github@gmail.com>"]
 license = "MIT"