diff --git a/.github/workflows/CompatHelper.yml b/.github/workflows/CompatHelper.yml
index 8ad0284c..80fb294f 100644
--- a/.github/workflows/CompatHelper.yml
+++ b/.github/workflows/CompatHelper.yml
@@ -15,10 +15,9 @@ jobs:
         run: which julia
         continue-on-error: true
       - name: Install Julia, but only if it is not already available in the PATH
-        uses: julia-actions/setup-julia@v2
+        uses: julia-actions/setup-julia@v3
         with:
           version: '1'
-          arch: ${{ runner.arch }}
         if: steps.julia_in_path.outcome != 'success'
       - name: "Add the General registry via Git"
         run: |
diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 740de6dc..2d07c7f8 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
-      - uses: julia-actions/setup-julia@v2
+      - uses: julia-actions/setup-julia@v3
         with:
           version: '1'
       - run: |
diff --git a/.github/workflows/tests-nightly.yml b/.github/workflows/tests-nightly.yml
index 385894ae..d386f650 100644
--- a/.github/workflows/tests-nightly.yml
+++ b/.github/workflows/tests-nightly.yml
@@ -10,20 +10,18 @@ on:
 
 jobs:
   tests:
-    name: Test Julia (${{ matrix.jlversion }}, ${{ matrix.os }}-${{ matrix.arch }})
+    name: Test Julia (${{ matrix.jlversion }}, ${{ matrix.os }})
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
       matrix:
-        arch: [x64] # x86 unsupported by MicroMamba
         os: [ubuntu-latest, windows-latest, macos-latest]
         jlversion: ['~1.9.0-0', 'nightly']
     steps:
       - uses: actions/checkout@v6
-      - uses: julia-actions/setup-julia@v2
+      - uses: julia-actions/setup-julia@v3
         with:
           version: ${{ inputs.jl_version }}
-          arch: ${{ matrix.arch }}
       - uses: actions/cache@v5
         env:
           cache-name: cache-artifacts
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 682acd4a..fe7507d3 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -17,19 +17,16 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        arch: [x64] # x86 unsupported by MicroMamba
         os: [ubuntu-latest, windows-latest, macos-latest]
         jlversion: ['1','1.10']
         pythonexe: ['@CondaPkg']
         pyversion: ['3']
         include:
-        - arch: x64
-          os: ubuntu-latest
+        - os: ubuntu-latest
           jlversion: '1'
           pythonexe: python
           pyversion: '3'
-        - arch: x64
-          os: ubuntu-latest
+        - os: ubuntu-latest
           jlversion: '1'
           pythonexe: python
           pyversion: '3.14t'
@@ -38,10 +35,9 @@ jobs:
       - uses: actions/checkout@v6
 
       - name: Set up Julia ${{ matrix.jlversion }}
-        uses: julia-actions/setup-julia@v2
+        uses: julia-actions/setup-julia@v3
         with:
           version: ${{ matrix.jlversion }}
-          arch: ${{ matrix.arch }}
 
       - uses: julia-actions/cache@v3
 
@@ -122,7 +118,7 @@ jobs:
   
       - name: Set up Julia
         id: setup_julia
-        uses: julia-actions/setup-julia@v2
+        uses: julia-actions/setup-julia@v3
         with:
           # Python in the GitHub runners ships with OpenSSL 3.0. Julia 1.12 requires
           # OpenSSL 3.5. Therefore juliapkg requires Julia 1.11 or lower.