diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index e796ea41a9..03f001bd21 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -22,7 +22,7 @@ jobs:
           python-version: ${{ matrix.python-version }}
 
       - name: install tools and dependencies
-        run: python3 -m pip install -U setuptools pip wheel pytest
+        run: python3 -m pip install -U setuptools pip wheel pytest scipy
 
       - name: build
         run: cd tvb_kernels; pip install .
diff --git a/tvb_kernels/test_nodes.py b/tvb_kernels/test_nodes.py
index d6272b0e31..b6fa0d36d6 100644
--- a/tvb_kernels/test_nodes.py
+++ b/tvb_kernels/test_nodes.py
@@ -1,5 +1,3 @@
-import pylab as pl
-import time
 import numpy as np
 import scipy.sparse
 import enum