diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 6aaedb5804..148b6e17db 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -185,9 +185,8 @@ jobs:
 
       - name: Install pip packages
         run: |
-          ./.pip_install_for_ci.sh 'cython~=0.29' 'netcdf4~=1.5' 'sympy~=1.5' 'gcovr' 'cmake' zoidberg fastcov
-          # Add the pip install location to the runner's PATH
-          echo ~/.local/bin >> $GITHUB_PATH
+          python -m pip install --upgrade pip setuptools
+          python -m pip install -r requirements.txt
 
       - name: Cache SUNDIALS build
         uses: actions/cache@v3
diff --git a/.pip_install_for_ci.sh b/.pip_install_for_ci.sh
deleted file mode 100755
index 4a5258cc2d..0000000000
--- a/.pip_install_for_ci.sh
+++ /dev/null
@@ -1,20 +0,0 @@
-#!/usr/bin/env bash
-
-set -e
-
-export PATH=${HOME}/.local/bin:${PATH}
-pip3 install --user --upgrade pip~=20.0 setuptools~=46.1
-pip3 install --user --upgrade scipy~=1.4 numpy~=1.18 natsort~=8.1.0
-for package in $@
-do
-    if test $package == "cython"
-    then
-        # fast install Cython
-        pip3 install --user Cython --install-option="--no-cython-compile"
-    elif test $package == "something_else"
-    then
-        pip3 install what_we_need
-    else
-        pip3 install --user $package
-    fi
-done
diff --git a/requirements.txt b/requirements.txt
index 03f43a92d2..75358b10db 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,8 @@
 Jinja2>=2.11.3
 numpy>=1.14.1
 scipy>=1.0.0
-netcdf4>=1.3.1
+netcdf4~=1.6.0
 matplotlib>=2.0.0
-Cython>=0.29.0
+Cython~=3.0.0
+boututils~=0.2.1
+boutdata~=0.2.1