diff --git a/.github/workflows/compatibility.yml b/.github/workflows/compatibility.yml
new file mode 100644
index 00000000..eead69d8
--- /dev/null
+++ b/.github/workflows/compatibility.yml
@@ -0,0 +1,36 @@
+name: Compatibility
+on:
+  schedule:
+    - cron: '0 4 * * SUN'
+jobs:
+  test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest]
+        python-version: ['3.10']
+        toxenv: [py310-test-all-latest]
+        # release: [main, latest] # there are no releases yet so this would break
+        release: [main]
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v3
+      - if: matrix.release != 'main'
+        name: Checkout Release
+        run: |
+          git checkout tags/$(curl -s https://api.github.com/repos/simonsobs/SOLikeT/releases/${{ matrix.release }} | python -c "import sys, json; print(json.load(sys.stdin)['tag_name'])")
+      - name: Install Conda w/ Python ${{ matrix.python-version }}
+        uses: conda-incubator/setup-miniconda@v2
+        with:
+          auto-activate-base: false
+          python-version: ${{ matrix.python-version }}
+          channels: conda-forge
+      - name: Install Dependencies
+        shell: bash -el {0}
+        run: |
+          pip install tox-conda
+      - name: Run Tests
+        shell: bash -el {0}
+        run: |
+          tox -e ${{ matrix.toxenv }} ${{ matrix.toxargs }} -- ${{ matrix.toxposargs }}
\ No newline at end of file
diff --git a/soliket/mflike/theoryforge_MFLike.py b/soliket/mflike/theoryforge_MFLike.py
index 39cdd5d2..b04ec625 100644
--- a/soliket/mflike/theoryforge_MFLike.py
+++ b/soliket/mflike/theoryforge_MFLike.py
@@ -80,11 +80,12 @@ def initialize(self):
         # State requisites to the theory code
         # Which lmax for theory CMB
         # Note this must be greater than lmax above to avoid approx errors
-        self.lmax_boltzmann = self.lmax + 50
+        self.lmax_boltzmann = self.lmax + 500
 
         # Which lmax for theory FG
         # This can be larger than lmax boltzmann
-        self.lmax_fg = max(9000, self.lmax_boltzmann)
+        self.lmax_fg = self.lmax + 500
+
 
         # Which spectra to consider
         self.requested_cls = self.spectra["polarizations"]