diff --git a/.github/workflows/build_and_test.yaml b/.github/workflows/build_and_test.yaml
index 46e5cda..2994d85 100644
--- a/.github/workflows/build_and_test.yaml
+++ b/.github/workflows/build_and_test.yaml
@@ -46,17 +46,17 @@ jobs:
           cmake --version
           cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_EXPORT_COMPILE_COMMANDS=ON ..
 
-      - uses: actions/upload-artifact@v5
+      - uses: actions/upload-artifact@v6
         if: failure()
         with:
           name: ${{ format('Ubuntu {0}', matrix.UBUNTU_VERSION) }} CMakeCache
           path: ${{ env.FANS_BUILD_DIR }}/CMakeCache.txt
-      - uses: actions/upload-artifact@v5
+      - uses: actions/upload-artifact@v6
         if: failure()
         with:
           name: ${{ format('Ubuntu {0}', matrix.UBUNTU_VERSION) }} CMakeLogs
           path: '${{ env.FANS_BUILD_DIR }}/CMakeFiles/*.log'
-      - uses: actions/upload-artifact@v5
+      - uses: actions/upload-artifact@v6
         if: failure()
         with:
           name: ${{ format('Ubuntu {0}', matrix.UBUNTU_VERSION) }} CompileCommands
@@ -75,7 +75,7 @@ jobs:
         run: |
           su -c "ctest" ${{ env.FANS_MPI_USER }}
 
-      - uses: actions/upload-artifact@v5
+      - uses: actions/upload-artifact@v6
         if: failure()
         with:
           name: ${{ format('Ubuntu {0}', matrix.UBUNTU_VERSION) }} CTest logs
@@ -87,7 +87,7 @@ jobs:
       - name: Run pytest checks on HDF5 output
         run: pixi run -e dashboard pytest
 
-      - uses: actions/upload-artifact@v5
+      - uses: actions/upload-artifact@v6
         if: failure()
         with:
           name: ${{ format('Ubuntu {0}', matrix.UBUNTU_VERSION) }} PyTest logs
diff --git a/.github/workflows/pixi_build.yaml b/.github/workflows/pixi_build.yaml
index aca9b10..412235e 100644
--- a/.github/workflows/pixi_build.yaml
+++ b/.github/workflows/pixi_build.yaml
@@ -31,12 +31,12 @@ jobs:
         run: pixi run test
 
       - name: Upload test logs
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: ${{ matrix.os }} test-logs
           path: test/output/*.log
 
-      - uses: actions/upload-artifact@v5
+      - uses: actions/upload-artifact@v6
         if: failure()
         with:
           name: ${{ matrix.os }} PyTest logs
diff --git a/pixi.lock b/pixi.lock
index ea573cb..a1b4345 100644
--- a/pixi.lock
+++ b/pixi.lock
@@ -3,6 +3,8 @@ environments:
   dashboard:
     channels:
     - url: https://conda.anaconda.org/conda-forge/
+    options:
+      pypi-prerelease-mode: if-necessary-or-explicit
     packages:
       linux-64:
       - conda: https://conda.anaconda.org/conda-forge/linux-64/_libgcc_mutex-0.1-conda_forge.tar.bz2
@@ -1454,6 +1456,8 @@ environments:
   default:
     channels:
     - url: https://conda.anaconda.org/conda-forge/
+    options:
+      pypi-prerelease-mode: if-necessary-or-explicit
     packages:
       linux-64:
       - conda: https://conda.anaconda.org/conda-forge/linux-64/_libgcc_mutex-0.1-conda_forge.tar.bz2
@@ -1852,7 +1856,7 @@ environments:
       - conda: https://conda.anaconda.org/conda-forge/linux-64/zstandard-0.25.0-py314h0f05182_1.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/zstd-1.5.7-hb8e6e7a_2.conda
       - conda: .
-        build: h04f5b5a_0
+        build: h1235946_0
       linux-aarch64:
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/_openmp_mutex-4.5-2_gnu.tar.bz2
       - conda: https://conda.anaconda.org/conda-forge/noarch/_python_abi3_support-1.0-hd8ed1ab_2.conda
@@ -2943,10 +2947,12 @@ environments:
       - conda: https://conda.anaconda.org/conda-forge/osx-arm64/zstandard-0.25.0-py314h9d33bd4_1.conda
       - conda: https://conda.anaconda.org/conda-forge/osx-arm64/zstd-1.5.7-h6491c7d_2.conda
       - conda: .
-        subdir: osx-arm64
+        build: hcb8d3e5_0
   dev:
     channels:
     - url: https://conda.anaconda.org/conda-forge/
+    options:
+      pypi-prerelease-mode: if-necessary-or-explicit
     packages:
       linux-64:
       - conda: https://conda.anaconda.org/conda-forge/linux-64/_libgcc_mutex-0.1-conda_forge.tar.bz2
@@ -6119,8 +6125,11 @@ packages:
 - conda: .
   name: fans
   version: 0.6.1
-  build: h04f5b5a_0
+  build: h1235946_0
   subdir: linux-64
+  variants:
+    cxx_compiler: clangxx
+    target_platform: linux-64
   depends:
   - libstdcxx >=15
   - libgcc >=15
@@ -6128,7 +6137,7 @@ packages:
   - fftw >=3.3.10,<4.0a0
   - fftw * mpi_openmpi_*
   input:
-    hash: 81734781fed742a3ee906fd6767759243525440b3f419cd0622b90e4d0f107fe
+    hash: 16dd9c1131985cbcdb3bb37c6672fa20ea368188987b8d42da1b2ebd02bd9fbf
     globs: []
 - conda: .
   name: fans
@@ -6160,15 +6169,18 @@ packages:
 - conda: .
   name: fans
   version: 0.6.1
-  build: hbf21a9e_0
+  build: hcb8d3e5_0
   subdir: osx-arm64
+  variants:
+    cxx_compiler: clangxx
+    target_platform: osx-arm64
   depends:
   - libcxx >=21
   - hdf5 >=1.14.6,<1.14.7.0a0 mpi_openmpi_*
   - fftw >=3.3.10,<4.0a0
   - fftw * mpi_openmpi_*
   input:
-    hash: 8ad54598e221efef736cec65db9e327856f556e55f81445cda5620e181ef8813
+    hash: 16dd9c1131985cbcdb3bb37c6672fa20ea368188987b8d42da1b2ebd02bd9fbf
     globs: []
 - conda: https://conda.anaconda.org/conda-forge/linux-64/fftw-3.3.10-mpi_openmpi_h99e62ba_10.conda
   sha256: 59a1fd0daa71bd5529e19b4da8aae2ded4d4ef05e5e31d80c39cbe2fc7664b6a
diff --git a/pixi.toml b/pixi.toml
index 2d25fe1..45b9abd 100644
--- a/pixi.toml
+++ b/pixi.toml
@@ -58,6 +58,7 @@ extra-args = [
     ]
 
 [workspace.target.osx-arm64.build-variants]
+cxx_compiler = ["clangxx"]
 
 [workspace.target.linux-64.build-variants]
 cxx_compiler = ["clangxx"]