diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 0aa7dd7695afbace1d21b301fdcca9630538b573..d9e1bff5e90955543ef6318ea2677e990864d180 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -7,7 +7,7 @@ stages:
 
 variables:
   DOCKER_IMAGE: "registry.duniter.org/docker/python3/poetry"
-  PYTHON_VERSION: "3.5"
+  PYTHON_VERSION: "3.6"
 
 image: $DOCKER_IMAGE/$PYTHON_VERSION:latest
 
@@ -114,4 +114,4 @@ pages:
       when: manual
     - if: $CI_COMMIT_BRANCH == "master"
       when: manual
-    - when: never
\ No newline at end of file
+    - when: never
diff --git a/README.md b/README.md
index 687cfd3800b99b865fb8c93a10e577b4e8c38aa3..73d18383247192dcf74a1beb43f49d3b061f00f4 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,7 @@ This library is used by two clients:
 - Sign/verify and encrypt/decrypt messages with the Duniter credentials
 
 ## Requirements
-- Python >= 3.5.3
+- Python >= 3.6.8
 - [aiohttp >= 3.6.1](https://pypi.org/pypi/aiohttp)
 - [pylibscrypt](https://pypi.org/pypi/pylibscrypt)
 - [libnacl](https://pypi.org/pypi/libnacl)
diff --git a/docs/index.rst b/docs/index.rst
index f31799ac886362261a0369dd5eec60b1686a0f3f..1635985ac50d5fc5756c62d76e3aa33f96cd04ae 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -16,7 +16,7 @@ Duniterpy helps to handle the following problem :
 Requirements
 ------------
 
-Duniterpy requires Python 3.5.x minimum.
+Duniterpy requires Python 3.6.x minimum.
 
 Installation
 ------------
diff --git a/pyproject.toml b/pyproject.toml
index 9075982aad00d3a19e39155fbc2c3109aa1e7290..257b8ad19007aecb9e951309e5ed91348f35f9b4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -24,7 +24,7 @@ requires = ["poetry>=0.12"]
 build-backend = "poetry.masonry.api"
 
 [tool.poetry.dependencies]
-python = "^3.5.3"
+python = "^3.6.8"
 aiohttp = "^3.6.1"
 jsonschema = "^3.0.2"
 pypeg2 = "^2.15.2"
@@ -35,7 +35,7 @@ libnacl = "^1.6.1"
 pyaes = "^1.6.1"
 
 [tool.poetry.dev-dependencies]
-black = { version = "^19.3b0", python = "^3.6" }
+black = "^19.3b0"
 mypy = "^0.730"
 pylint = "^2.4.2"
 sphinx = "^3.0.2"