diff --git a/.github/workflows/cache-pixi-lock.yml b/.github/workflows/cache-pixi-lock.yml
index e190ce7b11..e938a7664d 100644
--- a/.github/workflows/cache-pixi-lock.yml
+++ b/.github/workflows/cache-pixi-lock.yml
@@ -12,25 +12,25 @@ on:
 
 jobs:
   cache-pixi-lock:
-    name: Generate output
+    name: Pixi lock
     runs-on: ubuntu-latest
     outputs:
       cache-id: ${{ steps.restore.outputs.cache-primary-key }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
           submodules: recursive
       - name: Get current date
         id: date
         run: echo "date=$(date +'%Y-%m-%d')" >> "$GITHUB_OUTPUT"
-      - uses: actions/cache/restore@v4
+      - uses: actions/cache/restore@v5
         id: restore
         with:
           path: |
             pixi.lock
-          key: ${{ steps.date.outputs.date }}_${{inputs.pixi-version}}_${{hashFiles('pixi.toml')}}
-      - uses: prefix-dev/setup-pixi@v0.9.0
+          key: ${{ steps.date.outputs.date }}_${{ inputs.pixi-version }}_${{hashFiles('pixi.toml')}}
+      - uses: prefix-dev/setup-pixi@v0.9.3
         if: ${{ !steps.restore.outputs.cache-hit }}
         with:
           pixi-version: ${{ inputs.pixi-version }}
@@ -38,7 +38,7 @@ jobs:
       - name: Run pixi lock
         if: ${{ !steps.restore.outputs.cache-hit }}
         run: pixi lock
-      - uses: actions/cache/save@v4
+      - uses: actions/cache/save@v5
         if: ${{ !steps.restore.outputs.cache-hit }}
         id: cache
         with:
@@ -46,7 +46,7 @@ jobs:
             pixi.lock
           key: ${{ steps.restore.outputs.cache-primary-key }}
       - name: Upload pixi.lock
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: pixi-lock
           path: pixi.lock
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e9d66dbe14..48ac47341d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,9 +16,14 @@ defaults:
   run:
     shell: bash -el {0}
 
+env:
+  PIXI_VERSION: "v0.63.0"
+
 jobs:
   cache-pixi-lock:
     uses: ./.github/workflows/cache-pixi-lock.yml
+    with:
+      pixi-version: "v0.62.2" # keep in sync with env var above
   unit-test:
     name: "Unit tests: ${{ matrix.os }} | pixi run -e ${{ matrix.pixi-environment }} tests"
     runs-on: ${{ matrix.os }}-latest
@@ -49,6 +54,7 @@ jobs:
           key: ${{ needs.cache-pixi-lock.outputs.cache-id }}
       - uses: prefix-dev/setup-pixi@v0.9.0
         with:
+          pixi-version: ${{ env.PIXI_VERSION }}
           cache: true
           cache-write: ${{ github.event_name == 'push' && github.ref_name == 'v4-dev' }} # TODO: Update v4-dev to main when v4 is released
       # https://github.com/actions/cache/blob/main/tips-and-workarounds.md#update-a-cache
@@ -112,6 +118,7 @@ jobs:
           key: ${{ needs.cache-pixi-lock.outputs.cache-id }}
       - uses: prefix-dev/setup-pixi@v0.9.0
         with:
+          pixi-version: ${{ env.PIXI_VERSION }}
           cache: true
           cache-write: ${{ github.event_name == 'push' && github.ref_name == 'v4-dev' }} # TODO: Update v4-dev to main when v4 is released
       - name: Integration test
@@ -159,6 +166,7 @@ jobs:
           key: ${{ needs.cache-pixi-lock.outputs.cache-id }}
       - uses: prefix-dev/setup-pixi@v0.9.0
         with:
+          pixi-version: ${{ env.PIXI_VERSION }}
           cache: true
           cache-write: ${{ github.event_name == 'push' && github.ref_name == 'v4-dev' }} # TODO: Update v4-dev to main when v4 is released
       - name: Typechecking
diff --git a/pixi.toml b/pixi.toml
index 3e28cc342f..f67712291d 100644
--- a/pixi.toml
+++ b/pixi.toml
@@ -10,7 +10,7 @@ version = "dynamic" # dynamic versioning needs better support in pixi https://gi
 license = "MIT" # can remove this once https://github.com/prefix-dev/pixi-build-backends/issues/397 is resolved
 
 [package.build]
-backend = { name = "pixi-build-python", version = "==0.4.0" }
+backend = { name = "pixi-build-python", version = "0.4.*" }
 
 [package.host-dependencies]
 setuptools = "*"