diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a5f97c55..50f029c0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -19,7 +19,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install -r requirements.txt -r dev-requirements.txt
+        pip install -r requirements.txt -r requirements.dev.txt
     - name: Linting checks
       run: |
         # stop the build if there are any Python syntax errors
diff --git a/.gitignore b/.gitignore
index 82989a87..12c16764 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,7 +7,8 @@
 *.rdb
 
 environments/
-!environments/docker.dev
+!environments/dev-docker-postgres.env
+!environments/dev-docker-mysql.env
 
 .coverage
 tags
diff --git a/Makefile b/Makefile
index b52e806f..e64ec2ff 100644
--- a/Makefile
+++ b/Makefile
@@ -7,19 +7,31 @@ help:  ## Show this help menu
 	@echo "Usage: make [TARGET ...]"
 	@echo ""
 	@grep --no-filename -E '^[a-zA-Z_%-]+:.*?## .*$$' $(MAKEFILE_LIST) | \
-		awk 'BEGIN {FS = ":.*?## "}; {printf "%-10s %s\n", $$1, $$2}'
+		awk 'BEGIN {FS = ":.*?## "}; {printf "%-25s %s\n", $$1, $$2}'
 
 .PHONY: dc-start
 dc-start: dc-stop  ## Start dev docker server
-	@docker compose -f docker-compose.yml up --build --scale adminer=0 -d;
+	@docker compose -f docker-compose-postgres.yml up --build --scale adminer=0 -d;
 
 .PHONY: dc-start-adminer
 dc-start-adminer: dc-stop  ## Start dev docker server (with adminer)
-	@docker compose -f docker-compose.yml up --build -d;
+	@docker compose -f docker-compose-postgres.yml up --build -d;
 
 .PHONY: dc-stop
 dc-stop:  ## Stop dev docker server
-	@docker compose -f docker-compose.yml stop;
+	@docker compose -f docker-compose-postgres.yml stop;
+
+.PHONY: dc-start-mysql
+dc-start-mysql: dc-stop  ## Start dev docker server using MySQL
+	@docker compose -f docker-compose-mysql.yml up --build --scale adminer=0 -d;
+
+.PHONY: dc-start-adminer-mysql
+dc-start-adminer-mysql: dc-stop  ## Start dev docker server using MySQL (with adminer)
+	@docker compose -f docker-compose-mysql.yml up --build -d;
+
+.PHONY: dc-stop-mysql
+dc-stop-mysql:  ## Stop dev docker server using MySQL
+	@docker compose -f docker-compose-mysql.yml stop;
 
 VENV           = venv
 VENV_PYTHON    = $(VENV)/bin/python
@@ -36,7 +48,7 @@ venv: $(VENV_PYTHON)  ## Create a Python virtual environment
 .PHONY: deps
 deps:  ## Install Python requirements in virtual environment
 	$(PYTHON) -m pip install --upgrade pip
-	$(PYTHON) -m pip install --no-cache-dir -r requirements.txt -r dev-requirements.txt
+	$(PYTHON) -m pip install --no-cache-dir -r requirements.txt -r requirements.dev.txt
 
 .PHONY: checks
 checks: tests ruff mypy bandit  ## Run all checks (unit tests, ruff, mypy, bandit)
@@ -80,5 +92,5 @@ logs:  ## Follow Flask logs
 	docker logs shhh-app-1 -f -n 10
 
 .PHONY: db-logs
-db-logs:  ## Follow Postgre logs
+db-logs:  ## Follow database logs
 	docker logs shhh-db-1 -f -n 10
diff --git a/README.md b/README.md
index 7c442e72..debffb5d 100644
--- a/README.md
+++ b/README.md
@@ -23,7 +23,7 @@ You can find in this repo everything you need to host the app yourself.
 Or you can **one-click deploy to Heroku** using the below button.
 It will generate a fully configured private instance of Shhh 
 immediately (using your own server running Flask behind Gunicorn and Nginx, 
-and your own Postgres database).
+and your own PostgreSQL database).
 
 [![Deploy][heroku-shield]][heroku] (see [here](#initiate-the-database-tables) to 
 initiate the db tables after deploying on Heroku)
@@ -83,9 +83,16 @@ Once the container image has finished building and has started, you
 can access: 
 
 * Shhh at <http://localhost:8081>
-* Adminer at <http://localhost:8082/?pgsql=db&username=shhh&db=shhh> (if launched with `dc-start-adminer`)
+* Adminer at <http://localhost:8082> (if launched with `dc-start-adminer`)
 
-_You can find the development database credentials from the env file at [/environments/docker.dev](https://github.com/smallwat3r/shhh/blob/master/environments/docker.dev)._
+_You can find the development database credentials from the env file at [/environments/dev-docker-postgres.env](https://github.com/smallwat3r/shhh/blob/master/environments/dev-docker-postgres.env)._
+
+You have also the option to use `MySQL` instead of `PostgreSQL`, using these commands:
+```sh
+make dc-start-mysql          # to start the app
+make dc-start-adminer-mysql  # to start the app with adminer (SQL editor)
+make dc-stop-mysql           # to stop the app
+```
 
 #### Initiate the database tables
 
@@ -158,10 +165,24 @@ Bellow is the list of environment variables used by Shhh.
 
 #### Mandatory
 * `FLASK_ENV`: the environment config to load (`testing`, `dev-local`, `dev-docker`, `heroku`, `production`).
-* `POSTGRES_HOST`: Postgresql hostname
+* `DB_HOST`: Database hostname
+* `DB_USER`: Database username
+* `DB_PASSWORD`: Database password
+* `DB_NAME`: Database name
+* `DB_ENGINE`: Database engine to use (ex: `postgresql+psycopg2`, `mysql+pymysql`)
+
+Depending if you can use PostgreSQL or MySQL you might also need to set (these need to match the values
+you've specified as `DB_NAME`, `DB_PASSWORD` and `DB_NAME` above):
+
 * `POSTGRES_USER`: Postgresql username
 * `POSTGRES_PASSWORD`: Postgresql password
-* `POSTGRES_DB`: Database name
+* `POSTGRES_DB`: Postgresql database name
+
+or
+
+* `MYSQLUSER`: MySQL username
+* `MYSQL_PASSWORD`: MySQL password
+* `MYSQL_DATABASE`: MySQL database name
 
 #### Optional
 * `SHHH_HOST`: This variable can be used to specify a custom hostname to use as the
@@ -175,10 +196,6 @@ asleep (for instance this happens often on Heroku free plans). The default retry
 * `SHHH_DB_LIVENESS_SLEEP_INTERVAL`: This variable manages the interval in seconds between the database
 liveness retries. The default value is 1 second.
 
-## Acknowledgements
-
-Special thanks: [@AustinTSchaffer](https://github.com/AustinTSchaffer), [@kleinfelter](https://github.com/kleinfelter)  
-
 ## License
 
 See [LICENSE](https://github.com/smallwat3r/shhh/blob/master/LICENSE) file.
diff --git a/docker-compose-mysql.yml b/docker-compose-mysql.yml
new file mode 100644
index 00000000..16fd39ef
--- /dev/null
+++ b/docker-compose-mysql.yml
@@ -0,0 +1,29 @@
+version: '3.2'
+services:
+  db:
+    image: mysql:8.2
+    env_file:
+      - ./environments/dev-docker-mysql.env
+    ports:
+      - 3306:3306
+  app:
+    build:
+      context: .
+      dockerfile: dockerfiles/alpine.dev.mysql.Dockerfile
+    image: shhh
+    depends_on:
+      - db
+    env_file:
+      - ./environments/dev-docker-mysql.env
+    ports:
+      - 8081:8081
+    volumes:
+      - .:/opt/shhh:delegated
+  adminer:
+    image: adminer
+    depends_on:
+      - db
+    ports:
+      - 8082:8080
+volumes:
+  mysql:
diff --git a/docker-compose-postgres.yml b/docker-compose-postgres.yml
new file mode 100644
index 00000000..98a763e6
--- /dev/null
+++ b/docker-compose-postgres.yml
@@ -0,0 +1,29 @@
+version: '3.2'
+services:
+  db:
+    image: postgres:15.4-alpine3.18
+    env_file:
+      - ./environments/dev-docker-postgres.env
+    ports:
+      - 5432:5432
+  app:
+    build:
+      context: .
+      dockerfile: dockerfiles/alpine.dev.Dockerfile
+    image: shhh
+    depends_on:
+      - db
+    env_file:
+      - ./environments/dev-docker-postgres.env
+    ports:
+      - 8081:8081
+    volumes:
+      - .:/opt/shhh:delegated
+  adminer:
+    image: adminer
+    depends_on:
+      - db
+    ports:
+      - 8082:8080
+volumes:
+  postgres:
diff --git a/docker-compose.yml b/docker-compose.yml
deleted file mode 100644
index 4206e714..00000000
--- a/docker-compose.yml
+++ /dev/null
@@ -1,40 +0,0 @@
-# Describes the docker-compose configuration for development environments.
-# These settings are not secure and are not intended for production use.
-# Please override this configuration when configuring a production instance.
-# This config launch Flask (gunicorn) / Postgres / Adminer
-
-version: '3.2'
-
-services:
-  db:
-    image: postgres:15.4-alpine3.18
-    env_file:
-      - ./environments/docker.dev
-    volumes:
-      - ./postgres/init.sql:/docker-entrypoint-initdb.d/init.sql
-    ports:
-      - 5432:5432
-
-  app:
-    build:
-      context: .
-      dockerfile: alpine.dev.Dockerfile
-    image: shhh
-    depends_on:
-      - db
-    env_file:
-      - ./environments/docker.dev
-    ports:
-      - 8081:8081
-    volumes:
-      - .:/opt/shhh:delegated
-
-  adminer:
-    image: adminer
-    depends_on:
-      - db
-    ports:
-      - 8082:8080
-
-volumes:
-  postgres:
diff --git a/alpine.dev.Dockerfile b/dockerfiles/alpine.dev.Dockerfile
similarity index 95%
rename from alpine.dev.Dockerfile
rename to dockerfiles/alpine.dev.Dockerfile
index da30c707..41b540d6 100644
--- a/alpine.dev.Dockerfile
+++ b/dockerfiles/alpine.dev.Dockerfile
@@ -29,13 +29,13 @@ ENV TZ UTC
 
 WORKDIR /opt/shhh
 
-ENV GROUP=app USER=shhh UID=12345 GID=23456
+ARG GROUP=app USER=shhh UID=1001 GID=1001
 
 RUN addgroup --gid "$GID" "$GROUP" \
     && adduser --uid "$UID" --disabled-password --gecos "" \
         --ingroup "$GROUP" "$USER"
 
-USER "$USER"
+USER $USER
 ENV PATH="/home/$USER/.local/bin:${PATH}"
 
 ENV CRYPTOGRAPHY_DONT_BUILD_RUST=1
diff --git a/dockerfiles/alpine.dev.mysql.Dockerfile b/dockerfiles/alpine.dev.mysql.Dockerfile
new file mode 100644
index 00000000..5f237d0d
--- /dev/null
+++ b/dockerfiles/alpine.dev.mysql.Dockerfile
@@ -0,0 +1,51 @@
+# This dockerfile runs the application with the bare Flask
+# server. As it's for development only purposes.
+#
+# When using Gunicorn in a more prod-like config, multiple
+# workers would require to use the --preload option, else
+# the scheduler would spawn multiple scheduler instances.
+#
+# Note it would not be comptatible with Gunicorn --reload
+# flag, which is useful to reload the app on change, for
+# development purposes.
+#
+# Example: CMD gunicorn -b :8081 -w 3 wsgi:app --preload
+#
+# To use Gunicorn, please use: alpine.gunicorn.Dockerfile
+
+FROM python:3.12-alpine3.18
+
+RUN apk update \
+  && apk add --no-cache \
+    gcc \
+    g++ \
+    libffi-dev \
+    musl-dev \
+    mariadb-dev \
+    yarn \
+  && python -m pip install --upgrade pip
+
+ENV TZ UTC
+
+WORKDIR /opt/shhh
+
+ARG GROUP=app USER=shhh UID=1001 GID=1001
+
+RUN addgroup --gid "$GID" "$GROUP" \
+    && adduser --uid "$UID" --disabled-password --gecos "" \
+        --ingroup "$GROUP" "$USER"
+
+USER $USER
+ENV PATH="/home/$USER/.local/bin:${PATH}"
+
+ENV CRYPTOGRAPHY_DONT_BUILD_RUST=1
+
+COPY requirements.mysql.txt .
+RUN pip install --no-cache-dir --no-warn-script-location \
+    --user -r requirements.mysql.txt
+
+COPY --chown=$USER:$GROUP . .
+
+RUN yarn install --modules-folder=shhh/static/vendor
+
+CMD flask run --host=0.0.0.0 --port 8081 --reload
diff --git a/alpine.gunicorn.Dockerfile b/dockerfiles/alpine.gunicorn.Dockerfile
similarity index 92%
rename from alpine.gunicorn.Dockerfile
rename to dockerfiles/alpine.gunicorn.Dockerfile
index 1087b73b..0190a646 100644
--- a/alpine.gunicorn.Dockerfile
+++ b/dockerfiles/alpine.gunicorn.Dockerfile
@@ -14,13 +14,13 @@ ENV TZ UTC
 
 WORKDIR /opt/shhh
 
-ENV GROUP=app USER=shhh UID=12345 GID=23456
+ARG GROUP=app USER=shhh UID=1001 GID=1001
 
 RUN addgroup --gid "$GID" "$GROUP" \
     && adduser --uid "$UID" --disabled-password --gecos "" \
         --ingroup "$GROUP" "$USER"
 
-USER "$USER"
+USER $USER
 ENV PATH="/home/$USER/.local/bin:${PATH}"
 
 ENV CRYPTOGRAPHY_DONT_BUILD_RUST=1
diff --git a/environments/docker.dev b/environments/docker.dev
deleted file mode 100644
index 5ede1d3e..00000000
--- a/environments/docker.dev
+++ /dev/null
@@ -1,35 +0,0 @@
-# dev-docker env
-# env file for local development purposes only
-# please do not use this env file in production
-
-# [MANDATORY]
-
-FLASK_ENV=dev-docker
-FLASK_DEBUG=1
-
-POSTGRES_HOST=db
-POSTGRES_USER=shhh
-POSTGRES_PASSWORD=dummypassword
-POSTGRES_PORT=5432
-POSTGRES_DB=shhh
-
-PGDATA=/data/postgres
-
-# [OPTIONAL]
-
-# This variable can be used to specify a custom hostname to use as the
-# domain URL when Shhh creates a secret (ex: https://<domain-name.com>). If not
-# set, the hostname defaults to request.url_root, which should be fine in
-# most cases.
-SHHH_HOST=
-
-# Default max secret length
-SHHH_SECRET_MAX_LENGTH=
-
-# Number of tries to reach the database before performing a read or write operation. It
-# could happens that the database is not reachable or is asleep (for instance this happens
-# often on Heroku free plans). The default retry number is 5.
-SHHH_DB_LIVENESS_RETRY_COUNT=
-
-# Sleep interval in seconds between database liveness retries. The default value is 1 second.
-SHHH_DB_LIVENESS_SLEEP_INTERVAL=
diff --git a/postgres/init.sql b/postgres/init.sql
deleted file mode 100644
index 5f1c6c15..00000000
--- a/postgres/init.sql
+++ /dev/null
@@ -1,2 +0,0 @@
-SELECT 'CREATE DATABASE shhh'
-WHERE NOT EXISTS (SELECT FROM pg_database WHERE datname = 'shhh')\gexec
diff --git a/dev-requirements.txt b/requirements.dev.txt
similarity index 100%
rename from dev-requirements.txt
rename to requirements.dev.txt
diff --git a/requirements.mysql.txt b/requirements.mysql.txt
new file mode 100644
index 00000000..c3edcc96
--- /dev/null
+++ b/requirements.mysql.txt
@@ -0,0 +1,34 @@
+APScheduler==3.10.4
+blinker==1.7.0
+certifi==2023.7.22
+cffi==1.16.0
+charset-normalizer==3.3.2
+click==8.1.7
+cryptography==41.0.5
+cssmin==0.2.0
+Flask==3.0.0
+Flask-APScheduler==1.13.1
+Flask-Assets==2.1.0
+Flask-SQLAlchemy==3.1.1
+gunicorn==21.2.0
+htmlmin==0.1.12
+idna==3.4
+itsdangerous==2.1.2
+Jinja2==3.1.2
+jsmin==3.0.1
+MarkupSafe==2.1.3
+marshmallow==3.20.1
+packaging==23.2
+pycparser==2.21
+PyMySQL==1.1.0
+python-dateutil==2.8.2
+pytz==2023.3.post1
+requests==2.31.0
+six==1.16.0
+SQLAlchemy==2.0.23
+typing_extensions==4.8.0
+tzlocal==5.2
+urllib3==2.1.0
+webargs==8.3.0
+webassets==2.0
+Werkzeug==3.0.1
diff --git a/shhh/config.py b/shhh/config.py
index 1ee6464e..6ab2fdd5 100644
--- a/shhh/config.py
+++ b/shhh/config.py
@@ -9,19 +9,19 @@ class DefaultConfig:
 
     DEBUG = True
 
-    # Postgres connection.
-    POSTGRES_HOST = os.environ.get("POSTGRES_HOST", "localhost")
-    POSTGRES_USER = os.environ.get("POSTGRES_USER")
-    POSTGRES_PASSWORD = os.environ.get("POSTGRES_PASSWORD")
-    POSTGRES_PORT = os.environ.get("POSTGRES_PORT", 5432)
-    POSTGRES_DB = os.environ.get("POSTGRES_DB", "shhh")
+    DB_HOST = os.environ.get("DB_HOST", "localhost")
+    DB_USER = os.environ.get("DB_USER")
+    DB_PASSWORD = os.environ.get("DB_PASSWORD")
+    DB_PORT = os.environ.get("DB_PORT", 5432)
+    DB_NAME = os.environ.get("DB_NAME", "shhh")
+    DB_ENGINE = os.environ.get("DB_ENGINE", "postgresql+psycopg2")
 
     # SqlAlchemy
     SQLALCHEMY_ECHO = False
     SQLALCHEMY_TRACK_MODIFICATIONS = False
     SQLALCHEMY_DATABASE_URI = (
-        f"postgresql+psycopg2://{POSTGRES_USER}:{POSTGRES_PASSWORD}"
-        f"@{POSTGRES_HOST}:{POSTGRES_PORT}/{POSTGRES_DB}")
+        f"{DB_ENGINE}://{DB_USER}:{DB_PASSWORD}"
+        f"@{DB_HOST}:{DB_PORT}/{DB_NAME}")
 
     #
     # Shhh optional custom configurations
@@ -78,7 +78,7 @@ class TestConfig(DefaultConfig):
     DEBUG = False
     TESTING = True
 
-    SQLALCHEMY_DATABASE_URI = "sqlite://"
+    SQLALCHEMY_DATABASE_URI = "sqlite://"  # in memory
 
     SHHH_HOST = "http://test.test"
     SHHH_SECRET_MAX_LENGTH = 20
@@ -100,7 +100,7 @@ class ProductionConfig(DefaultConfig):
 
 
 class HerokuConfig(ProductionConfig):
-    """Heroku configuration (heroku)."""
+    """Heroku configuration (heroku). Only support PostgreSQL."""
 
     # SQLAlchemy 1.4 removed the deprecated postgres dialect name, the name
     # postgresql must be used instead. This URL is automatically set on