diff --git a/.github/workflows/pr.yaml b/.github/workflows/pr.yaml
index 106b2f6..1bc9ced 100644
--- a/.github/workflows/pr.yaml
+++ b/.github/workflows/pr.yaml
@@ -12,18 +12,23 @@ concurrency:
 
 jobs:
   regression:
-    name: Regression
-    runs-on: ubuntu-24.04
-    timeout-minutes: 30
+    name: Regression (${{ matrix.os }})
+    runs-on: ${{ matrix.os }}
+    timeout-minutes: 60
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-26.04, macos-26-intel, macos-26]
 
     steps:
       - name: Checkout
         uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8
 
-      - name: Setup Conda
-        uses: conda-incubator/setup-miniconda@8ee1f361103df19b6f8c8655fd3967a8ecb162d5 # v4
+      - name: Setup Mamba
+        uses: conda-incubator/setup-miniconda@v4.1.0
         with:
           miniforge-variant: Miniforge3
+          mamba-version: "*"
           auto-activate: true
           activate-environment: base
           conda-remove-defaults: true
@@ -33,7 +38,7 @@ jobs:
       - name: Install conda-build
         shell: bash -l {0}
         run: |
-          conda install -y \
+          mamba install -y \
             --override-channels \
             -c conda-forge \
             conda-build
@@ -49,7 +54,7 @@ jobs:
 
   docs:
     name: Docs
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     timeout-minutes: 20
 
     steps:
diff --git a/.github/workflows/regression-tests.yaml b/.github/workflows/regression-tests.yaml
index d046ca2..d6d8d90 100644
--- a/.github/workflows/regression-tests.yaml
+++ b/.github/workflows/regression-tests.yaml
@@ -17,9 +17,13 @@ concurrency:
 
 jobs:
   regression:
-    name: SIST Regression
-    runs-on: ubuntu-24.04
+    name: SIST Regression (${{ matrix.os }})
+    runs-on: ${{ matrix.os }}
     timeout-minutes: 30
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-26.04, macos-26-intel, macos-26]
 
     steps:
       - name: Checkout
diff --git a/.github/workflows/release.yaml b/.github/workflows/release.yaml
index bf09da2..3b18f21 100644
--- a/.github/workflows/release.yaml
+++ b/.github/workflows/release.yaml
@@ -14,7 +14,7 @@ permissions:
 jobs:
   checks:
     name: Version check
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     steps:
     - name: Checkout repository
       id: repo
@@ -56,7 +56,7 @@ jobs:
   version:
     name: prepare ${{ github.event.inputs.version }}
     needs: checks
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     steps:
 
       - name: checkout
@@ -141,7 +141,7 @@ jobs:
   tag:
     name: tag release
     needs: version
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     steps:
       - name: Checkout repository
         uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
@@ -158,7 +158,7 @@ jobs:
   release:
     name: make github release
     needs: tag
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     steps:
 
       - name: create release
@@ -206,9 +206,13 @@ jobs:
             --data-urlencode "content=${CONTENT}"
 
   conda:
-    name: publish conda to anaconda.org
+    name: publish conda to anaconda.org (${{ matrix.os }})
     needs: [tag, release]
-    runs-on: ubuntu-24.04
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-26.04, macos-26-intel, macos-26]
 
     steps:
       - name: Checkout
diff --git a/docs/source/installation.rst b/docs/source/installation.rst
index a64614c..874b825 100644
--- a/docs/source/installation.rst
+++ b/docs/source/installation.rst
@@ -1,6 +1,15 @@
 Installation
 ============
 
+Supported platforms
+--------------------
+
+SIST's Conda package is built and tested on:
+
+* ``linux-64``
+* ``osx-64``
+* ``osx-arm64``
+
 Conda
 -----
 
diff --git a/src/sist/ir_finder.py b/src/sist/ir_finder.py
index 236add7..8509d66 100644
--- a/src/sist/ir_finder.py
+++ b/src/sist/ir_finder.py
@@ -325,6 +325,7 @@ def _score_reports(
                 str(self.IRF_MAX_LENGTH),
                 str(self.IRF_MAX_LOOP),
             ],
+            stdin=subprocess.DEVNULL,
             stdout=subprocess.DEVNULL,
             stderr=subprocess.DEVNULL,
             check=False,