diff --git a/.github/workflows/CompatHelper.yml b/.github/workflows/CompatHelper.yml
index 3e6ff906..48c58b55 100644
--- a/.github/workflows/CompatHelper.yml
+++ b/.github/workflows/CompatHelper.yml
@@ -6,7 +6,7 @@ on:
   workflow_dispatch:
 jobs:
   CompatHelper:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-slim
     steps:
       - name: Check if Julia is already available
         id: julia_in_path
diff --git a/.github/workflows/TagBot.yml b/.github/workflows/TagBot.yml
index 3fd18cee..e58184f2 100644
--- a/.github/workflows/TagBot.yml
+++ b/.github/workflows/TagBot.yml
@@ -8,7 +8,7 @@ on:
 jobs:
   TagBot:
     if: github.event_name == 'workflow_dispatch' || github.actor == 'JuliaTagBot'
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-slim
     steps:
       - name: Create new release tag
         uses: JuliaRegistries/TagBot@v1
diff --git a/.github/workflows/doc-preview-cleanup.yml b/.github/workflows/doc-preview-cleanup.yml
index f0863bcb..d7ca2b6f 100644
--- a/.github/workflows/doc-preview-cleanup.yml
+++ b/.github/workflows/doc-preview-cleanup.yml
@@ -6,7 +6,7 @@ on:
   workflow_dispatch:
 jobs:
   doc-preview-cleanup:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-slim
     steps:
       - name: Checkout gh-pages branch
         uses: actions/checkout@v6
diff --git a/.github/workflows/documentation.yml b/.github/workflows/documentation.yml
index 32ec448f..13fdd431 100644
--- a/.github/workflows/documentation.yml
+++ b/.github/workflows/documentation.yml
@@ -27,7 +27,7 @@ jobs:
       - name: Set up Julia
         uses: julia-actions/setup-julia@v2
         with:
-          version: '1'
+          version: '1.12.4'  # parser broken on 1.12.5
       - name: Check out repository
         uses: actions/checkout@v6
       - name: Cache artifacts
diff --git a/.github/workflows/format.yml b/.github/workflows/format.yml
index 2b152488..2fbd403c 100644
--- a/.github/workflows/format.yml
+++ b/.github/workflows/format.yml
@@ -6,10 +6,12 @@ on:
   workflow_dispatch:
 jobs:
   format:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-slim
     steps:
       - name: Check out repository
         uses: actions/checkout@v6
+      - name: Set up Julia
+        uses: julia-actions/setup-julia@v2
       - name: Cache artifacts
         uses: julia-actions/cache@v2
       - name: Install JuliaFormatter and format
diff --git a/.github/workflows/invalidations.yml b/.github/workflows/invalidations.yml
index b773cffd..fe127a45 100644
--- a/.github/workflows/invalidations.yml
+++ b/.github/workflows/invalidations.yml
@@ -12,7 +12,7 @@ concurrency:
   cancel-in-progress: true
 jobs:
   evaluate:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-slim
     if: "!contains(github.event.head_commit.message, 'skip ci')"
     env:
       JULIA_PKG_SERVER: ''
diff --git a/.github/workflows/spell-check.yml b/.github/workflows/spell-check.yml
index 6488eff4..bc01c9db 100644
--- a/.github/workflows/spell-check.yml
+++ b/.github/workflows/spell-check.yml
@@ -9,7 +9,7 @@ concurrency:
   cancel-in-progress: true
 jobs:
   spell-check:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-slim
     if: "!contains(github.event.head_commit.message, 'skip ci')"
     steps:
       - name: Check out repository
diff --git a/.github/workflows/test-pull-request.yml b/.github/workflows/test-pull-request.yml
index 2fb92080..7ef6b991 100644
--- a/.github/workflows/test-pull-request.yml
+++ b/.github/workflows/test-pull-request.yml
@@ -22,7 +22,6 @@ jobs:
           - '1'
         os:
           - ubuntu-latest
-          - windows-latest
         arch:
           - x64
         include: