diff --git a/.github/workflows/run_tests_iris.yml b/.github/workflows/run_tests_iris.yml
index c47030ff..41ad19d5 100644
--- a/.github/workflows/run_tests_iris.yml
+++ b/.github/workflows/run_tests_iris.yml
@@ -12,7 +12,7 @@ jobs:
   iris-gpu:
     runs-on: iris-gpu
     container:
-      image: nvidia/cuda:12.6.3-devel-ubi8
+      image: ghcr.io/catthehacker/ubuntu:act-22.04
       env:
         NVIDIA_VISIBLE_DEVICES: ${{ env.NVIDIA_VISIBLE_DEVICES }}
 
@@ -35,7 +35,6 @@ jobs:
       - name: Install httomo-backends
         run: |
           micromamba activate httomo_backends
-          pip install --no-deps httomolibgpu
           pip install .[dev]
           micromamba list
                 
diff --git a/conda/environment.yml b/conda/environment.yml
index fa76970f..c837beb6 100644
--- a/conda/environment.yml
+++ b/conda/environment.yml
@@ -4,6 +4,7 @@ channels:
   - httomo
 dependencies:
   - conda-forge::astra-toolbox
+  - ccpi::ccpi-regulariser
   - conda-forge::cupy=12.3.0
   - conda-forge::h5py
   - conda-forge::imageio
diff --git a/pyproject.toml b/pyproject.toml
index 19c74024..73feacf8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -55,6 +55,7 @@ dependencies = [
     "astra-toolbox",
     "tomobar",
     "scikit-image",
+    "httomolibgpu",
 ]
 
 [project.optional-dependencies]