diff --git a/MANIFEST.in b/MANIFEST.in
index 74ea23b1..d47086be 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,3 +1,3 @@
 include *.rst
 recursive-include ihatemoney *.rst *.py *.yaml *.po *.mo *.html *.css *.js *.eot *.svg *.woff *.txt *.png *.ini *.cfg *.j2
-include LICENSE CONTRIBUTORS CHANGELOG.rst requirements.txt
+include LICENSE CONTRIBUTORS CHANGELOG.rst
diff --git a/Makefile b/Makefile
index 42b0e263..e6f1d8f4 100644
--- a/Makefile
+++ b/Makefile
@@ -14,7 +14,7 @@ all: install ## Alias for install
 install: virtualenv $(INSTALL_STAMP) ## Install dependencies
 $(INSTALL_STAMP):
 	$(VENV)/bin/pip install -U pip
-	$(VENV)/bin/pip install -r requirements.txt
+	$(VENV)/bin/pip install -e .
 	touch $(INSTALL_STAMP)
 
 .PHONY: virtualenv
@@ -24,8 +24,8 @@ $(PYTHON):
 
 .PHONY: install-dev
 install-dev: $(INSTALL_STAMP) $(DEV_STAMP) ## Install development dependencies
-$(DEV_STAMP): $(PYTHON) dev-requirements.txt
-	$(VENV)/bin/pip install -Ur dev-requirements.txt
+$(DEV_STAMP): $(PYTHON)
+	$(VENV)/bin/pip install -Ue .[dev]
 	touch $(DEV_STAMP)
 
 .PHONY: remove-install-stamp
@@ -76,13 +76,6 @@ create-empty-database-revision: ## Create an empty database revision
 	@read -p "Please enter a message describing this revision: " rev_message; \
 	$(PYTHON) -m ihatemoney.manage db revision -d ihatemoney/migrations -m "$${rev_message}"
 
-.PHONY: build-requirements
-build-requirements: ## Save currently installed packages to requirements.txt
-	$(VIRTUALENV) $(TEMPDIR)
-	$(TEMPDIR)/bin/pip install -U pip
-	$(TEMPDIR)/bin/pip install -Ue "."
-	$(TEMPDIR)/bin/pip freeze | grep -v -- '-e' > requirements.txt
-
 .PHONY: clean
 clean: ## Destroy the virtual environment
 	rm -rf .venv
diff --git a/dev-requirements.txt b/dev-requirements.txt
deleted file mode 100644
index e198b7b8..00000000
--- a/dev-requirements.txt
+++ /dev/null
@@ -1,6 +0,0 @@
-zest.releaser
-tox
-pytest
-flake8
-Flask-Testing
-mock; python_version < '3.3'
diff --git a/docs/contributing.rst b/docs/contributing.rst
index 0ca1da50..f5058999 100644
--- a/docs/contributing.rst
+++ b/docs/contributing.rst
@@ -23,10 +23,9 @@ install dependencies, and run the test server.
 The hard way
 ------------
 
-Alternatively, you can also use the `requirements.txt` file to install the
-dependencies yourself. That would be::
+Alternatively, you can use pip to install dependencies yourself. That would be::
 
-     pip install -r requirements.txt
+     pip install -e .
 
 And then run the application::
 
@@ -156,11 +155,7 @@ In order to prepare a new release, we are following the following steps:
 - Merge remaining pull requests;
 - Update :file:`CHANGELOG.rst` with the last changes;
 - Update :file:`CONTRIBUTORS`;
-- Update known good versions of dependencies in ``requirements.txt`` with this
-  command (from inside the venv)::
-
-    make build-requirements
-
+- Update known good versions of dependencies in ``setup.py``;
 - If needed, recompress assets. It requires zopflipng::
 
     make compress-assets
diff --git a/requirements.txt b/requirements.txt
deleted file mode 100644
index a4c66274..00000000
--- a/requirements.txt
+++ /dev/null
@@ -1,27 +0,0 @@
-alembic==1.1.0
-aniso8601==8.0.0
-Babel==2.7.0
-blinker==1.4
-Click==7.0
-dnspython==1.16.0
-email-validator==1.0.4
-Flask==1.1.1
-Flask-Babel==0.12.2
-Flask-Cors==3.0.8
-Flask-Mail==0.9.1
-Flask-Migrate==2.5.2
-Flask-RESTful==0.3.7
-Flask-Script==2.0.6
-Flask-SQLAlchemy==2.4.0
-Flask-WTF==0.14.2
-idna==2.8
-itsdangerous==1.1.0
-Jinja2==2.10.1
-Mako==1.1.0
-MarkupSafe==1.1.1
-python-dateutil==2.8.0
-pytz==2019.2
-six==1.12.0
-SQLAlchemy==1.3.8
-Werkzeug==0.15.6
-WTForms==2.2.1
diff --git a/setup.py b/setup.py
index a2a5a6df..9f34708d 100644
--- a/setup.py
+++ b/setup.py
@@ -56,18 +56,27 @@ setup(name='ihatemoney',
       include_package_data=True,
       zip_safe=False,
       install_requires=[
-          "flask",
-          "flask-wtf",
-          "flask-sqlalchemy<3.0",
-          "flask-mail",
-          "Flask-Migrate",
-          "Flask-script",
-          "flask-babel",
-          "flask-restful",
-          "jinja2",
-          "blinker",
-          "flask-cors",
-          "six",
-          "itsdangerous",
-          "email_validator"],
+          "blinker==1.4",
+          "email-validator==1.0.4",
+          "Flask==1.1.1",
+          "Flask-Babel==0.12.2",
+          "Flask-Cors==3.0.8",
+          "Flask-Mail==0.9.1",
+          "Flask-Migrate==2.5.2",
+          "Flask-RESTful==0.3.7",
+          "Flask-Script==2.0.6",
+          "Flask-SQLAlchemy==2.4.0",
+          "Flask-WTF==0.14.2",
+          "itsdangerous==1.1.0",
+          "Jinja2==2.10.1",
+          "six==1.12.0",
+      ],
+      extras_require={"dev": [
+          "zest.releaser",
+          "tox",
+          "pytest",
+          "flake8",
+          "Flask-Testing",
+          "mock; python_version < '3.3'"
+      ]},
       entry_points=ENTRY_POINTS)
diff --git a/tox.ini b/tox.ini
index e13fa190..ab05ff6e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -9,8 +9,7 @@ commands =
     py.test --pyargs ihatemoney.tests.tests
 
 deps =
-    -rdev-requirements.txt
-    -rrequirements.txt
+    -e.[dev]
 
 # To be sure we are importing ihatemoney pkg from pip-installed version
 changedir = /tmp
@@ -23,8 +22,6 @@ changedir = {toxinidir}
 
 [testenv:lint]
 commands = flake8 ihatemoney
-deps =
-    -rdev-requirements.txt
 changedir = {toxinidir}
 
 [flake8]