diff --git a/.github/workflows/build_testing.yml b/.github/workflows/build_testing.yml
index 2a9364fceb..c33d7b5646 100644
--- a/.github/workflows/build_testing.yml
+++ b/.github/workflows/build_testing.yml
@@ -83,6 +83,15 @@ jobs:
        run: |
          sudo apt-get update
          sudo apt-get -qq install netcdf-bin
+     - name: Install nccmp
+       run: |
+         wget -O Miniforge3.sh "https://github.com/conda-forge/miniforge/releases/latest/download/Miniforge3-$(uname)-$(uname -m).sh"
+         bash Miniforge3.sh -b -p "${HOME}/conda"
+         source "${HOME}/conda/etc/profile.d/conda.sh"
+         conda activate
+         conda install -q nccmp
+         path=$(which nccmp)
+         ln -s "$path" "${HOME}/nccmp"
      - name: Run Tox
        run: tox -e ${{ matrix.env }}
        working-directory: utils/python/MITgcmutils
diff --git a/utils/python/MITgcmutils/tests/data b/utils/python/MITgcmutils/tests/data
index 693f48825e..6a6a371d33 160000
--- a/utils/python/MITgcmutils/tests/data
+++ b/utils/python/MITgcmutils/tests/data
@@ -1 +1 @@
-Subproject commit 693f48825eb746716933345476159cc802cd2f9b
+Subproject commit 6a6a371d335cf986c33361a6631a7e57d3f6c261
diff --git a/utils/python/MITgcmutils/tests/run-scripts b/utils/python/MITgcmutils/tests/run-scripts
index 45ae165ff8..3ba3f018aa 100755
--- a/utils/python/MITgcmutils/tests/run-scripts
+++ b/utils/python/MITgcmutils/tests/run-scripts
@@ -22,8 +22,8 @@ for f in \
     echo "Metadata doesn't match reference: $f"
     err=1
   fi
-  if ! diff tests/md5/$f.md5 $o.md5; then
-    echo "Checksum doesn't match reference: $f"
+  if ! $HOME/nccmp -d -m tests/data/gluemncbig/$f.nc $o.nc; then
+    echo "Data doesn't match reference: $f"
     err=1
   else
     rm $o.cdl $o.md5 $o.nc