diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9f7e19b1e..8604429f0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -108,7 +108,7 @@ jobs:
           fetch-depth: 0
       - uses: prefix-dev/setup-pixi@v0.9.4
         with:
-          pixi-version: v0.68.0
+          pixi-version: v0.78.0
           frozen: true
           environments: lint
       - run: pixi run -e lint lint
@@ -128,7 +128,7 @@ jobs:
           fetch-depth: 0
       - uses: prefix-dev/setup-pixi@v0.9.4
         with:
-          pixi-version: v0.68.0
+          pixi-version: v0.78.0
           frozen: true
           environments: ${{ matrix.package }}
       - name: Run tests
diff --git a/.github/workflows/claude-linkcheck-failure.yml b/.github/workflows/claude-linkcheck-failure.yml
index 586a9d8d9..bd9355a74 100644
--- a/.github/workflows/claude-linkcheck-failure.yml
+++ b/.github/workflows/claude-linkcheck-failure.yml
@@ -45,7 +45,7 @@ jobs:
       - uses: prefix-dev/setup-pixi@v0.9.4
         if: steps.api-key.outputs.configured == 'true'
         with:
-          pixi-version: v0.68.0
+          pixi-version: v0.78.0
           run-install: false
 
       - name: Configure Git author
diff --git a/.github/workflows/claude-nightly-failure.yml b/.github/workflows/claude-nightly-failure.yml
index f37cf423f..394d4fae2 100644
--- a/.github/workflows/claude-nightly-failure.yml
+++ b/.github/workflows/claude-nightly-failure.yml
@@ -45,7 +45,7 @@ jobs:
       - uses: prefix-dev/setup-pixi@v0.9.4
         if: steps.api-key.outputs.configured == 'true'
         with:
-          pixi-version: v0.68.0
+          pixi-version: v0.78.0
           run-install: false
 
       - uses: astral-sh/setup-uv@08807647e7069bb48b6ef5acd8ec9567f424441b # v8.1.0
diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index b5cdc977e..72dfaf838 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -64,7 +64,7 @@ jobs:
           fetch-depth: 0  # history required to determine version
       - uses: prefix-dev/setup-pixi@v0.9.4
         with:
-          pixi-version: v0.68.0
+          pixi-version: v0.78.0
           frozen: true
           environments: docs-${{ inputs.package }}
       - name: Build docs
diff --git a/.github/workflows/nightly-linkcheck.yml b/.github/workflows/nightly-linkcheck.yml
index 0ed7a56de..f6e9f1031 100644
--- a/.github/workflows/nightly-linkcheck.yml
+++ b/.github/workflows/nightly-linkcheck.yml
@@ -34,7 +34,7 @@ jobs:
           fetch-depth: 0  # history required to determine version
       - uses: prefix-dev/setup-pixi@v0.9.4
         with:
-          pixi-version: v0.68.0
+          pixi-version: v0.78.0
           frozen: true
           environments: docs-${{ matrix.package }}
       - name: Check links
diff --git a/.github/workflows/nightly.yml b/.github/workflows/nightly.yml
index a4dc1bfc1..5baaa44b9 100644
--- a/.github/workflows/nightly.yml
+++ b/.github/workflows/nightly.yml
@@ -42,7 +42,7 @@ jobs:
           fetch-tags: true
       - uses: prefix-dev/setup-pixi@v0.9.4
         with:
-          pixi-version: v0.68.0
+          pixi-version: v0.78.0
           frozen: true
           environments: ${{ matrix.package }}
       - name: Run tests
diff --git a/.github/workflows/weekly-platform.yml b/.github/workflows/weekly-platform.yml
index c932116c2..a712a6d45 100644
--- a/.github/workflows/weekly-platform.yml
+++ b/.github/workflows/weekly-platform.yml
@@ -32,7 +32,7 @@ jobs:
           fetch-depth: 0
       - uses: prefix-dev/setup-pixi@v0.9.4
         with:
-          pixi-version: v0.68.0
+          pixi-version: v0.78.0
           frozen: true
           environments: ${{ matrix.package }}
       - name: Run tests
diff --git a/pixi.lock b/pixi.lock
index 96b9eebdb..4e36431a3 100644
--- a/pixi.lock
+++ b/pixi.lock
@@ -6,13 +6,13 @@ platforms:
   - __linux=4.18
   - __glibc=2.28
   - __archspec=0=x86_64
-- name: p1
+- name: osx-64-macos-14-0
   subdir: osx-64
   virtual-packages:
   - __osx=14.0
   - __unix=0=0
   - __archspec=0=x86_64
-- name: p2
+- name: osx-arm64-macos-14-0
   subdir: osx-arm64
   virtual-packages:
   - __osx=14.0
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       - conda: https://conda.anaconda.org/conda-forge/noarch/font-ttf-dejavu-sans-mono-2.37-hab24e00_0.tar.bz2
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       - conda: https://conda.anaconda.org/conda-forge/noarch/font-ttf-dejavu-sans-mono-2.37-hab24e00_0.tar.bz2
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       - conda: https://conda.anaconda.org/conda-forge/noarch/ca-certificates-2026.5.20-hbd8a1cb_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/font-ttf-dejavu-sans-mono-2.37-hab24e00_0.tar.bz2
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-      p2:
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       - conda: https://conda.anaconda.org/conda-forge/noarch/ca-certificates-2026.5.20-hbd8a1cb_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/font-ttf-dejavu-sans-mono-2.37-hab24e00_0.tar.bz2
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diff --git a/pixi.toml b/pixi.toml
index 6e28f7d9d..b721ac51f 100644
--- a/pixi.toml
+++ b/pixi.toml
@@ -1,17 +1,20 @@
 [workspace]
 name = "ess"
 channels = ["conda-forge"]
-platforms = ["linux-64", "osx-64", "osx-arm64", "win-64"]
+# Scipp requires macOS 14 or newer.
+platforms = [
+    "linux-64",
+    { platform = "osx-64", macos = "14.0" },
+    { platform = "osx-arm64", macos = "14.0" },
+    "win-64",
+]
 version = "2026.2.0"
+requires-pixi = ">=0.71.3"
 exclude-newer = "14d"
 
 [dependencies]
 python = "3.12.*"
 
-[system-requirements]
-# Scipp does not support older OSX versions.
-macos = "14.0"
-
 [pypi-exclude-newer]
 scipp = "0m"
 scippneutron = "0m"