diff --git a/.github/workflows/run-tests.yml b/.github/workflows/run-tests.yml
index 7cc19a14..fdd5c9e8 100644
--- a/.github/workflows/run-tests.yml
+++ b/.github/workflows/run-tests.yml
@@ -42,6 +42,9 @@ jobs:
           channels: conda-forge
           environment-file: ./.ci-environments/macos-arm-environment.yml
           activate-environment: test_install_env
+        
+      - name: Install multispline (temporary)
+        run: python -m pip install git+https://github.com/cchapmanbird/multispline.git
 
       - name: Run Prebuild
         run: |
diff --git a/setup.py b/setup.py
index 53c3cd4d..36cb7e41 100644
--- a/setup.py
+++ b/setup.py
@@ -313,12 +313,6 @@ def build_extensions(self):
     )
     cpu_extension["include_dirs"] += gsl_include
 
-Interp2DAmplitude_ext = Extension(
-    "pyInterp2DAmplitude",
-    sources=["src/Interpolant.cc", "src/Amplitude.cc", "src/pyinterp2damp.pyx"],
-    **cpu_extension,
-)
-
 matmul_cpu_ext = Extension(
     "pymatmul_cpu", sources=["src/matmul.cpp", "src/pymatmul_cpu.pyx"], **cpu_extension
 )
@@ -344,7 +338,6 @@ def build_extensions(self):
 cpu_extensions = [
     matmul_cpu_ext,
     interp_cpu_ext,
-    Interp2DAmplitude_ext,
     AAK_cpu_ext,
     amp_interp_2d_ext,
 ]