diff --git a/.github/workflows/test-notebooks.yml b/.github/workflows/test-notebooks.yml
index 6464a5e1..2654532a 100644
--- a/.github/workflows/test-notebooks.yml
+++ b/.github/workflows/test-notebooks.yml
@@ -20,12 +20,12 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest]
-        python-version: [3.9]
+        python-version: ["3.10"]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
-      - uses: conda-incubator/setup-miniconda@v2
+      - uses: conda-incubator/setup-miniconda@v3
         with:
           miniforge-variant: Mambaforge
           miniforge-version: latest
@@ -39,7 +39,6 @@ jobs:
       - name: Install requirements
         run: |
           mamba install --file=requirements.txt
-          mamba install gimli.units
           mamba list
 
       - name: Build and install package
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index e29f722a..aafd94de 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -20,12 +20,12 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: [3.8, 3.9]
+        python-version: ["3.10"]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
-      - uses: conda-incubator/setup-miniconda@v2
+      - uses: conda-incubator/setup-miniconda@v3
         with:
           miniforge-variant: Mambaforge
           miniforge-version: latest
@@ -39,7 +39,6 @@ jobs:
       - name: Install requirements
         run: |
           mamba install --file=requirements.txt --file=requirements-testing.txt
-          mamba install gimli.units
           mamba list
 
       - name: Install Windows requirements
@@ -66,5 +65,5 @@ jobs:
           pytest --cov=pymt --cov-report=xml:$(pwd)/coverage.xml -vvv
 
       - name: Coveralls
-        if: matrix.os == 'ubuntu-latest' && matrix.python-version == '3.9'
+        if: matrix.os == 'ubuntu-latest' && matrix.python-version == '3.10'
         uses: AndreMiras/coveralls-python-action@v20201129
diff --git a/requirements.txt b/requirements.txt
index 601a674a..2476dac6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,11 +1,11 @@
 click
 deprecated
+gimli.units>=0.3.2
 jinja2
 landlab>=2
 matplotlib
 model_metadata>=0.7
 netcdf4
-numpy<1.24  # for Ku
 pyyaml
 scipy<1.9  # see #162
 shapely<2  # see #164