diff --git a/.github/workflows/testing_checks.yaml b/.github/workflows/testing_checks.yaml
index 6d9fa29..560259f 100644
--- a/.github/workflows/testing_checks.yaml
+++ b/.github/workflows/testing_checks.yaml
@@ -17,7 +17,7 @@ on:
 
 jobs:
   testing:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     name: Running testing
     strategy:
       matrix:
@@ -33,11 +33,10 @@ jobs:
     steps:
       - name: Current python version
         run: python3 --version || echo python3 not installed
-      - name: Install Python 3.7
+      - name: Install Python 3.8
         uses: actions/setup-python@v2
         with:
-          python-version: '3.7'
-        id: install_python_3_7
+          python-version: '3.8'
       - name: Updated python version
         run: python3 --version
       - name: PYTHONPATH environment variable
@@ -54,13 +53,13 @@ jobs:
         run: find . -type f -name "*.py" > action_test_files.txt
       - name: Install system requirements
         shell: bash
-        run: 'sudo apt-get install -y python3-gdal gdal-bin libgdal-dev gcc g++ python3.7-dev'
+        run: 'sudo apt-get install -y python3-gdal gdal-bin libgdal-dev gcc g++ python3.8-dev'
       - name: Install Python numpy
         shell: bash
         run: 'python3 -m pip install --upgrade --no-cache-dir numpy wheel'
       - name: Install Python pygdal
         shell: bash
-        run: 'python3 -m pip install --no-cache-dir pygdal==2.2.3.5'
+        run: 'python3 -m pip install --no-cache-dir pygdal==3.0.4.*'
       - name: Install system requirements from source
         shell: bash
         run: 'if [ -s "packages.txt" ]; then (cat packages.txt | sudo xargs apt-get install -y --no-install-recommends) || (echo "Failed to install additional packages" && exit 1); fi'
diff --git a/test_data/rgb_plot.csv b/test_data/rgb_plot.csv
index 588ca1f..dbf916e 100644
--- a/test_data/rgb_plot.csv
+++ b/test_data/rgb_plot.csv
@@ -1,2 +1,2 @@
 species,site,timestamp,lat,lon,citation_author,citation_year,citation_title,excess greenness index excess_greenness_index ([-510:510]), green leaf index  green_leaf_index ( [-1:1]), cive  cive ( [-255:255]), normalized difference index  normalized_difference_index(pxarray) ( [-127:129]), excess red  excess_red ( [-255:255]), exgr  exgr ( [-255:332]), combined indices 1  combined_indices_1 ( [-1000:1000]), combined indices 2  combined_indices_2 ( [-1000:1000]), vegetative index  vegetative_index ( [-255:255]), normalized green-red difference  ngrdi ( [-255:255]), percent green  percent_green ( [0:100])
-Sorghum bicolor,,2018-10-11,33.07454704500288,-111.97502671168861,"Clairessa Brown","2020","Woebbecke, D.M. et al",14,0.02,16.2,-1.53,56.5,-42.5,30.2,12.8,1.02,-0.02,0.34
+Sorghum bicolor,,2018-10-11,33.074547045002895,-111.97502671168866,"Clairessa Brown","2020","Woebbecke, D.M. et al",14,0.02,16.2,-1.53,56.5,-42.5,30.2,12.8,1.02,-0.02,0.34