diff --git a/.python-version b/.python-version
index d2577d9..f7e5aa8 100644
--- a/.python-version
+++ b/.python-version
@@ -1 +1 @@
-3.7.7
+3.7.12
diff --git a/doc/DEVELOPMENT.md b/doc/DEVELOPMENT.md
index b4df330..af10163 100644
--- a/doc/DEVELOPMENT.md
+++ b/doc/DEVELOPMENT.md
@@ -197,6 +197,16 @@ source ./.venv/bin/activate
 python odoo/odoo-bin scaffold MODULE_NAME addons/REPO_NAME/
 ```
 
+## Python version
+
+Your actual version is in file .python-version. Use script `./script/version/change_python_version.sh 3.7.12` to change to version 3.7.12 .
+
+Run the installation, `make install_dev`.
+
+Update poetry, `./script/poetry_update.py`.
+
+Create docker, `make docker_build`.
+
 # Pull request
 
 ## Show all pull requests from organization
diff --git a/docker/Dockerfile.base b/docker/Dockerfile.base
index f6e408a..10fd213 100644
--- a/docker/Dockerfile.base
+++ b/docker/Dockerfile.base
@@ -1,4 +1,4 @@
-FROM  python:3.7.7-slim-buster
+FROM  python:3.7.12-slim-buster
 MAINTAINER TechnoLibre <docker@technolibre.ca>
 
 SHELL ["/bin/bash", "-xo", "pipefail", "-c"]
diff --git a/docker/python-versions.txt b/docker/python-versions.txt
index cbbb5ee..b44c537 100644
--- a/docker/python-versions.txt
+++ b/docker/python-versions.txt
@@ -1 +1 @@
-3.7.7
\ No newline at end of file
+3.7.12
\ No newline at end of file
diff --git a/pyproject.toml b/pyproject.toml
index 76db0fe..e1c71d2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -10,7 +10,7 @@ license = "AGPL-3.0-or-later"
 authors = [ "Mathieu Benoit <mathben@technolibre.ca>",]
 
 [tool.poetry.dependencies]
-python = "^3.7.7"
+python = "^3.7.12"
 Asterisk = "^0.0.8"
 Babel = "2.3.4"
 BeautifulSoup4 = "^4.10.0"
diff --git a/script/install_OSX_dependency.sh b/script/install_OSX_dependency.sh
index 61756db..1340d9b 100755
--- a/script/install_OSX_dependency.sh
+++ b/script/install_OSX_dependency.sh
@@ -37,8 +37,8 @@ sudo npm install -g rtlcss
 sudo npm install -g less
 sudo npm install -g prettier
 sudo npm install -g prettier @prettier/plugin-xml
-yes n|pyenv install 3.7.7
-pyenv local 3.7.7
+yes n|pyenv install 3.7.12
+pyenv local 3.7.12
 
 echo 'export PATH="/usr/local/opt/openssl@1.1/bin:$PATH"' >> ~/.zshrc
 
diff --git a/script/install_locally.sh b/script/install_locally.sh
index 9cf672d..a728292 100755
--- a/script/install_locally.sh
+++ b/script/install_locally.sh
@@ -25,7 +25,7 @@ if [[ ! -d "./addons/addons" ]]; then
 fi
 
 PYENV_PATH=~/.pyenv
-PYTHON_VERSION=3.7.7
+PYTHON_VERSION=3.7.12
 PYENV_VERSION_PATH=${PYENV_PATH}/versions/${PYTHON_VERSION}
 PYTHON_EXEC=${PYENV_VERSION_PATH}/bin/python
 POETRY_PATH=~/.poetry
diff --git a/script/version/change_python_version.sh b/script/version/change_python_version.sh
new file mode 100755
index 0000000..eadaf5c
--- /dev/null
+++ b/script/version/change_python_version.sh
@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+
+# $1 new version version, like 3.7.12
+
+input=".python-version"
+while IFS= read -r line
+do
+  echo -e "Actual version $line"
+  sed -i -e "s/$line/$1/g" ./.python-version
+  sed -i -e "s/$line/$1/g" ./docker/Dockerfile.base
+  sed -i -e "s/$line/$1/g" ./docker/python-versions.txt
+  sed -i -e "s/$line/$1/g" ./script/install_locally.sh
+  sed -i -e "s/$line/$1/g" ./script/install_OSX_dependency.sh
+  sed -i -e "s/$line/$1/g" ./pyproject.toml
+done < "$input"
+
+while IFS= read -r line
+do
+  echo -e "New version $line"
+done < "$input"