diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 672dc848af6d04a61ae0f71604edc2cbbaa0627a..5edfab6f5d64ddd50111d569b7f49aac1ee95f95 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -13,8 +13,8 @@ variables:
   stage: test
   before_script:
     - apt-get update && apt-get install -y --allow-unauthenticated libsasl2-dev libssl-dev locales locales-all
-    - pip install --use-deprecated=legacy-resolver -r requirements.txt --default-timeout=180 -i https://pypi.lcsb.uni.lu/simple/
-    - pip install --use-deprecated=legacy-resolver -r requirements-dev.txt --default-timeout=180 -i https://pypi.lcsb.uni.lu/simple/
+    - pip install -r requirements.txt --default-timeout=180 -i https://pypi.lcsb.uni.lu/simple/
+    - pip install -r requirements-dev.txt --default-timeout=180 -i https://pypi.lcsb.uni.lu/simple/
 
 test_postgres:
     <<: *test_definition
@@ -89,8 +89,8 @@ build_debian:
     - curl -sL https://deb.nodesource.com/setup_14.x | bash -
     - DEBIAN_FRONTEND=noninteractive apt-get install -y nodejs
 
-    - pip install --use-deprecated=legacy-resolver -r requirements.txt --default-timeout=180 -i https://pypi.lcsb.uni.lu/simple/
-    - pip install --use-deprecated=legacy-resolver -r requirements-dev.txt --default-timeout=180 -i https://pypi.lcsb.uni.lu/simple/
+    - pip install -r requirements.txt --default-timeout=180 -i https://pypi.lcsb.uni.lu/simple/
+    - pip install -r requirements-dev.txt --default-timeout=180 -i https://pypi.lcsb.uni.lu/simple/
 
     - export DEBFULLNAME="Piotr Gawron"
     - export DEBEMAIL="piotr.gawron@uni.lu"
diff --git a/Dockerfile b/Dockerfile
index 955f7115fc7acd0bcd0287a0e5c64c56fb3ea543..0b52e1a3990087a573d328adcf7ee6df58872505 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,7 +4,7 @@ RUN mkdir /code
 WORKDIR /code
 RUN apt-get update && apt-get install -y --allow-unauthenticated libsasl2-dev libssl-dev locales locales-all 
 ADD requirements* /code/
-RUN pip install --use-deprecated=legacy-resolver -r requirements.txt --default-timeout=180 -i https://pypi.lcsb.uni.lu/simple/ && pip install --use-deprecated=legacy-resolver -r requirements-dev.txt --default-timeout=180 -i https://pypi.lcsb.uni.lu/simple/ # --use-feature=2020-resolver
+RUN pip install -r requirements.txt --default-timeout=180 -i https://pypi.lcsb.uni.lu/simple/ && pip install -r requirements-dev.txt --default-timeout=180 -i https://pypi.lcsb.uni.lu/simple/ # --use-feature=2020-resolver
 ADD . /code/
 RUN cp local_settings_ci.py smash/smash/local_settings.py
 WORKDIR /code/smash
diff --git a/readme.md b/readme.md
index 82e6a16c766b40091f0a61ce61c559b19933c363..c5dc61cb6e66713e08de2f72cb0ac28318636a27 100644
--- a/readme.md
+++ b/readme.md
@@ -27,7 +27,7 @@ python manage.py createsuperuser
   - `cd scheduling-system`
   - `virtualenv env` to create new virtualenv (contains clean python working environment)
   - `. env/bin/activate` (to start using virtualenv)
-  - `pip install --use-deprecated=legacy-resolver -r requirements.txt` to install project's dependencies
+  - `pip install -r requirements.txt` to install project's dependencies
   - Create `local_settings.py` file in `(./scheduling-system)/smash/smash` directory by copying the template in `(./scheduling-system)/smash/smash/local_settings.template` and edit your local_setttings.py file to change your database connection data.
 
  - Update migration db scrpit from file structure (`./scheduling-system/smash/manage.py makemigrations`)