diff --git a/.github/actions/setup-env/action.yml b/.github/actions/setup-env/action.yml
index d3369056..c51ba756 100644
--- a/.github/actions/setup-env/action.yml
+++ b/.github/actions/setup-env/action.yml
@@ -55,16 +55,14 @@ runs:
       if: inputs.os == 'macos-14' || inputs.os == 'macos-15'
       shell: bash
       run: |
-        brew install mono
+        brew install mono --overwrite
         brew reinstall pkg-config
 
     - name: Setup Mono
-      if: inputs.os == 'macos-13'
+      if: runner.os == 'Linux'
       shell: bash
       run: |
-        brew install mono --overwrite 
-        brew install pkg-config --overwrite 
-
+        apt install mono-complete pkg-config
 
     - name: Versions
       shell: bash
diff --git a/.github/actions/test-build/action.yml b/.github/actions/test-build/action.yml
index 9f88757a..d3e742ee 100644
--- a/.github/actions/test-build/action.yml
+++ b/.github/actions/test-build/action.yml
@@ -102,7 +102,7 @@ runs:
         ignore_case: true
 
     - name: Run .NET 4.5 tests
-      # if:  runner.os == 'Windows'
+      if: inputs.os != 'macos-13'
       shell: bash
       run: node tools/test.js CI
 
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 95a089d1..6713182b 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -84,7 +84,7 @@ jobs:
       fail-fast: false
       matrix:
         # os: [macos-13, macos-15, ubuntu-24.04, ubuntu-24.04-arm, windows-2022]
-        os: [macos-13, macos-15]
+        os: [macos-13, macos-15, ubuntu-24.04]
        # node: [18, 20, 22, 23]
         node: [20, 22]
     steps:
@@ -104,7 +104,7 @@ jobs:
       #     pip install setuptools
 
       - name: Run .NET 4.5 tests
-        # if:  runner.os == 'Windows'
+        if: matrix.os != 'macos-13' && runner.os != 'Linux'
         shell: bash
         run: node tools/test.js CI