diff --git a/.github/workflows/benchmarks.yml b/.github/workflows/benchmarks.yml
index c18eb162f..9521b7b68 100644
--- a/.github/workflows/benchmarks.yml
+++ b/.github/workflows/benchmarks.yml
@@ -22,12 +22,13 @@ jobs:
           fetch-depth: 0
 
       - name: Set up conda environment
-        uses: mamba-org/provision-with-micromamba@v15
+        uses: mamba-org/setup-micromamba@v1
         with:
           environment-file: ci/environment.yml
           environment-name: flox-tests
-          cache-env: true
-          # extra-specs: |
+          init-shell: bash
+          cache-environment: true
+          # create-args: |
           #   python="${{ matrix.python-version }}"
 
       # - name: Setup some dependencies
diff --git a/.github/workflows/ci-additional.yaml b/.github/workflows/ci-additional.yaml
index 38fba5d88..9449d9290 100644
--- a/.github/workflows/ci-additional.yaml
+++ b/.github/workflows/ci-additional.yaml
@@ -53,14 +53,15 @@ jobs:
           echo "TODAY=$(date  +'%Y-%m-%d')" >> $GITHUB_ENV
 
       - name: Setup micromamba
-        uses: mamba-org/provision-with-micromamba@v15
+        uses: mamba-org/setup-micromamba@v1
         with:
           environment-file: ${{env.CONDA_ENV_FILE}}
           environment-name: flox-tests
-          extra-specs: |
-            python=${{env.PYTHON_VERSION}}
-          cache-env: true
+          init-shell: bash
+          cache-environment: true
           cache-env-key: "${{runner.os}}-${{runner.arch}}-py${{env.PYTHON_VERSION}}-${{env.TODAY}}-${{hashFiles(env.CONDA_ENV_FILE)}}"
+          create-args: |
+            python=${{ env.PYTHON_VERSION }}
 
       - name: Install flox
         run: |
@@ -102,14 +103,15 @@ jobs:
         run: |
           echo "TODAY=$(date +'%Y-%m-%d')" >> $GITHUB_ENV
       - name: Setup micromamba
-        uses: mamba-org/provision-with-micromamba@v15
+        uses: mamba-org/setup-micromamba@v1
         with:
           environment-file: ${{env.CONDA_ENV_FILE}}
           environment-name: flox-tests
-          extra-specs: |
-            python=${{env.PYTHON_VERSION}}
-          cache-env: true
+          init-shell: bash
+          cache-environment: true
           cache-env-key: "${{runner.os}}-${{runner.arch}}-py${{env.PYTHON_VERSION}}-${{env.TODAY}}-${{hashFiles(env.CONDA_ENV_FILE)}}"
+          create-args: |
+            python=${{ env.PYTHON_VERSION }}
       - name: Install flox
         run: |
           python -m pip install --no-deps -e .
diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 2d65e9d1d..75aafc4b6 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -34,13 +34,14 @@ jobs:
         run: |
           echo "PYTHON_VERSION=${{ matrix.python-version }}" >> $GITHUB_ENV
       - name: Set up conda environment
-        uses: mamba-org/provision-with-micromamba@v15
+        uses: mamba-org/setup-micromamba@v1
         with:
           environment-file: ci/environment.yml
           environment-name: flox-tests
-          cache-env: true
-          extra-specs: |
-            python="${{ matrix.python-version }}"
+          init-shell: bash
+          cache-environment: true
+          create-args: |
+            python=${{ matrix.python-version }}
       - name: Install flox
         run: |
           python -m pip install --no-deps -e .
@@ -77,13 +78,14 @@ jobs:
         with:
           fetch-depth: 0 # Fetch all history for all branches and tags.
       - name: Set up conda environment
-        uses: mamba-org/provision-with-micromamba@v15
+        uses: mamba-org/setup-micromamba@v1
         with:
-          environment-file: ci/${{ matrix.env }}.yml
+          environment-file: ci/environment.yml
           environment-name: flox-tests
-          cache-env: true
-          extra-specs: |
-            python="${{ matrix.python-version }}"
+          init-shell: bash
+          cache-environment: true
+          create-args: |
+            python=${{ matrix.python-version }}
       - name: Install flox
         run: |
           python -m pip install --no-deps -e .
@@ -111,13 +113,14 @@ jobs:
           repository: 'pydata/xarray'
           fetch-depth: 0 # Fetch all history for all branches and tags.
       - name: Set up conda environment
-        uses: mamba-org/provision-with-micromamba@v15
+        uses: mamba-org/setup-micromamba@v1
         with:
           environment-file: ci/requirements/environment.yml
           environment-name: xarray-tests
-          cache-env: true
-          extra-specs: |
-            python="3.10"
+          init-shell: bash
+          cache-environment: true
+          create-args: |
+            python=3.10
       - name: Install xarray
         run: |
           python -m pip install --no-deps .
diff --git a/.github/workflows/upstream-dev-ci.yaml b/.github/workflows/upstream-dev-ci.yaml
index 7bd271928..62645707e 100644
--- a/.github/workflows/upstream-dev-ci.yaml
+++ b/.github/workflows/upstream-dev-ci.yaml
@@ -35,12 +35,14 @@ jobs:
         run: |
           echo "PYTHON_VERSION=${{ matrix.python-version }}" >> $GITHUB_ENV
       - name: Set up conda environment
-        uses: mamba-org/provision-with-micromamba@v15
+        uses: mamba-org/setup-micromamba@v1
         with:
           environment-file: ci/upstream-dev-env.yml
           environment-name: flox-tests
-          extra-specs: |
-            python="${{ matrix.python-version }}"
+          init-shell: bash
+          cache-environment: true
+          create-args: >-
+            python=${{ matrix.python-version }}
             pytest-reportlog
       - name: Install flox
         run: |
diff --git a/flox/core.py b/flox/core.py
index f821df9bc..f8f700f99 100644
--- a/flox/core.py
+++ b/flox/core.py
@@ -1622,7 +1622,7 @@ def _convert_expected_groups_to_index(
                 out.append(ex)
         elif ex is not None:
             if isbin_:
-                out.append(pd.IntervalIndex.from_breaks(ex))  # type: ignore [arg-type] # TODO: what do we want here?
+                out.append(pd.IntervalIndex.from_breaks(ex))
             else:
                 if sort:
                     ex = np.sort(ex)