diff --git a/.config/dotnet-tools.json b/.config/dotnet-tools.json
index 681a9e801..d4e6efd32 100644
--- a/.config/dotnet-tools.json
+++ b/.config/dotnet-tools.json
@@ -3,7 +3,7 @@
   "isRoot": true,
   "tools": {
     "fable": {
-      "version": "4.23.0",
+      "version": "4.27.0",
       "commands": [
         "fable"
       ]
diff --git a/.github/workflows/fable.yml b/.github/workflows/fable.yml
index 6cd83b6e9..bc2a52fa7 100644
--- a/.github/workflows/fable.yml
+++ b/.github/workflows/fable.yml
@@ -9,7 +9,7 @@ on:
 
 jobs:
   testfable4:
-    runs-on: ubuntu-latest
+    runs-on: windows-latest
 
     steps:
     - uses: actions/checkout@v2
@@ -26,20 +26,12 @@ jobs:
           6.0.x
     - name: Restore tools
       run: dotnet tool restore
-    - name: Install jq
-      uses: dcarbone/install-jq-action@v1.0.1
-    - name: Install fable
-      run: |
-        version=`cat ./.config/dotnet-tools.json | jq --raw-output '.tools.fable.version'`
-        dotnet tool install --global Fable --version $version
-    - name: Use Node.js
-      uses: actions/setup-node@v1
-      with:
-        node-version: '18.x'
+    - name: Setup Node.js environment
+      uses: actions/setup-node@v5
     - name: Install npm dependencies
       working-directory: tests/FSharpPlusFable.Tests
       run: npm install
     - name: Run Fable tests
       working-directory: tests/FSharpPlusFable.Tests
-      run: fable . --outDir bin --runScript ./bin
+      run: dotnet fable . --outDir bin --runScript ./bin /d
 
diff --git a/src/FSharpPlus/Control/Comonad.fs b/src/FSharpPlus/Control/Comonad.fs
index e476c79f0..1b92d19c3 100644
--- a/src/FSharpPlus/Control/Comonad.fs
+++ b/src/FSharpPlus/Control/Comonad.fs
@@ -7,7 +7,7 @@ open System.Threading.Tasks
 open FSharpPlus
 open FSharpPlus.Extensions
 open FSharpPlus.Internals
-#if !FABLE_COMPILER4
+#if !FABLE_COMPILER_4
 
 // Comonad class ----------------------------------------------------------
 
diff --git a/tests/FSharpPlusFable.Tests/package.json b/tests/FSharpPlusFable.Tests/package.json
index 4572c8daf..a2531bd1d 100644
--- a/tests/FSharpPlusFable.Tests/package.json
+++ b/tests/FSharpPlusFable.Tests/package.json
@@ -2,7 +2,7 @@
   "private": true,
   "type": "module",
   "scripts": {
-    "test": "fable . --outDir bin --runScript ./bin /d",
+    "test": "dotnet fable . --outDir bin --runScript ./bin /d",
     "test_debug": "node --eval \"require('esm')(module)('./bin/./Tests.js')\" ./bin/./Tests.js ./bin /d"
   },
   "name": "tests"