diff --git a/.github/workflows/build_check.yml b/.github/workflows/build_check.yml
index 0949a3d07..95963d8aa 100644
--- a/.github/workflows/build_check.yml
+++ b/.github/workflows/build_check.yml
@@ -12,11 +12,11 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
-    - uses: conda-incubator/setup-miniconda@v2
+    - uses: conda-incubator/setup-miniconda@v3
     - name: Install prereq using conda
       run: |
         echo "$CONDA/bin" >> $GITHUB_PATH
-        conda install -c conda-forge gobject-introspection pygobject
+        conda install -c conda-forge gobject-introspection pygobject sphinx sphinx_rtd_theme nbconvert pandoc ipython
     - name: Install prereq using pip
       run: |
         pip install -r requirements.txt
@@ -33,11 +33,10 @@ jobs:
         pip install .
     - name: Install CCL from source
       run: |
-        conda install -c conda-forge cmake swig --override-channels
+        conda install -c conda-forge cmake swig setuptools_scm
         git clone https://github.com/LSSTDESC/CCL
         cd CCL
-        git checkout v3.0.0
-        pip install .
+        pip install --no-use-pep517 .
     - name: Analysing the code with pylint
       run: |
         pip install pylint
@@ -48,9 +47,10 @@ jobs:
         pytest tests/ --ignore=cluster_toolkit/tests --cov=clmm/
       env:
         DISPLAY: test
-    - name: Install Sphinx prereq
-      run: |
-        conda install -c conda-forge sphinx sphinx_rtd_theme nbconvert pandoc ipython ipython_genutils
+# temporarily moved up due to libarchive issue - see PR 620
+#    - name: Install Sphinx prereq
+#      run: |
+#        conda install -c conda-forge sphinx sphinx_rtd_theme nbconvert pandoc ipython ipython_genutils
     - name: Run the docs
       run: |
         make -C docs/ html
diff --git a/clmm/__init__.py b/clmm/__init__.py
index 3499c132b..50f8fa49f 100644
--- a/clmm/__init__.py
+++ b/clmm/__init__.py
@@ -26,4 +26,4 @@
 )
 from . import support
 
-__version__ = "1.12.0"
+__version__ = "1.12.1"
diff --git a/clmm/theory/ccl.py b/clmm/theory/ccl.py
index e95271031..7fcff5511 100644
--- a/clmm/theory/ccl.py
+++ b/clmm/theory/ccl.py
@@ -13,9 +13,8 @@
 # Check which versions of ccl are currently supported
 from . import _ccl_supported_versions
 
-if parse(ccl.__version__) < parse(_ccl_supported_versions.VMIN) or parse(ccl.__version__) > parse(
-    _ccl_supported_versions.VMAX
-):
+if (parse(ccl.__version__) < parse(_ccl_supported_versions.VMIN)
+    or parse(ccl.__version__).major > parse(_ccl_supported_versions.VMAX).major):
     raise EnvironmentError(
         f"Current CCL version ({ccl.__version__}) not supported by CLMM. "
         f"It must be between {_ccl_supported_versions.VMIN} and {_ccl_supported_versions.VMAX}."
diff --git a/clmm/theory/parent_class.py b/clmm/theory/parent_class.py
index b9d4fabfa..dea95d7f1 100644
--- a/clmm/theory/parent_class.py
+++ b/clmm/theory/parent_class.py
@@ -759,7 +759,10 @@ def eval_tangential_shear(self, r_proj, z_cl, z_src, z_src_info="discrete", verb
 
         if self.halo_profile_model == "einasto" and verbose:
             print(f"Einasto alpha = {self._get_einasto_alpha(z_cl=z_cl)}")
-        gammat = None
+
+        # function _validate_z_src already safekeeps from this error:
+        # pylint: disable=possibly-used-before-assignment
+
         if z_src_info == "discrete":
             warning_msg = (
                 "\nSome source redshifts are lower than the cluster redshift."
@@ -844,6 +847,9 @@ def eval_convergence(self, r_proj, z_cl, z_src, z_src_info="discrete", verbose=F
         if self.halo_profile_model == "einasto" and verbose:
             print(f"Einasto alpha = {self._get_einasto_alpha(z_cl=z_cl)}")
 
+        # function _validate_z_src already safekeeps from this error:
+        # pylint: disable=possibly-used-before-assignment
+
         if z_src_info == "discrete":
             warning_msg = (
                 "\nSome source redshifts are lower than the cluster redshift."
@@ -1053,6 +1059,9 @@ def eval_reduced_tangential_shear(
         if self.halo_profile_model == "einasto" and verbose:
             print(f"Einasto alpha = {self._get_einasto_alpha(z_cl=z_cl)}")
 
+        # functions _validate_z_src, _validate_approx_z_src_info already safekeeps from this error:
+        # pylint: disable=possibly-used-before-assignment
+
         if approx is None:
             if z_src_info == "distribution":
                 gt = self._pdz_weighted_avg(
@@ -1211,6 +1220,9 @@ def eval_magnification(
         if self.halo_profile_model == "einasto" and verbose:
             print(f"Einasto alpha = {self._get_einasto_alpha(z_cl=z_cl)}")
 
+        # functions _validate_z_src, _validate_approx_z_src_info already safekeeps from this error:
+        # pylint: disable=possibly-used-before-assignment
+
         if approx is None:
             if z_src_info == "distribution":
                 mu = self._pdz_weighted_avg(
@@ -1375,6 +1387,9 @@ def eval_magnification_bias(
         if self.halo_profile_model == "einasto" and verbose:
             print(f"Einasto alpha = {self._get_einasto_alpha(z_cl=z_cl)}")
 
+        # functions _validate_z_src, _validate_approx_z_src_info already safekeeps from this error:
+        # pylint: disable=possibly-used-before-assignment
+
         if approx is None:
             # z_src (float or array) is redshift
             if z_src_info == "distribution":