diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b6a474d..080fd4b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -6,11 +6,11 @@ jobs:
   Test:
     strategy:
       matrix:
-        os: [macos-latest, ubuntu-latest, windows-latest]
+        os: [macos-latest, ubuntu-latest, windows-2019]
     runs-on: ${{ matrix.os }}
     steps:
     - name: Check out repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
 
     - name: Install Boost and Csound on macOS
       run: brew install boost csound
@@ -18,9 +18,9 @@ jobs:
     - name: Install Boost and Csound on Linux
       run: |
         sudo apt-get --assume-yes install libboost-dev libsndfile1-dev
-        wget --no-verbose https://github.com/csound/csound/archive/refs/tags/6.17.0.tar.gz
-        tar -xf 6.17.0.tar.gz
-        cd csound-6.17.0
+        wget --no-verbose https://github.com/csound/csound/archive/refs/tags/6.18.1.tar.gz
+        tar -xf 6.18.1.tar.gz
+        cd csound-6.18.1
         cmake -S . -B build -DBUILD_DSSI_OPCODES=OFF
         cmake --build build
         sudo cmake --install build
@@ -29,21 +29,21 @@ jobs:
     - name: Install Boost and Csound on Windows
       run: |
         choco install boost-msvc-14.2 --no-progress
-        curl.exe --location --remote-name --remote-header-name --show-error --silent https://github.com/csound/csound/releases/download/6.17.0/csound-6.17.0-windows-x64-installer.zip
-        7z x csound-6.17.0-windows-x64-installer.zip
-        Start-Process csound-windows_x86_64-6.17.0-916.exe '/verySilent /noRestart' -Wait
-        Add-Content $Env:GITHUB_PATH "$Env:ProgramFiles\csound\bin" -Encoding utf8
-      if: ${{ matrix.os == 'windows-latest' }}
+        curl.exe --location --remote-name --remote-header-name --show-error --silent https://github.com/csound/csound/releases/download/6.18.1/Csound6_x64-6.18.1-windows-x64-installer.zip
+        7z x Csound6_x64-6.18.1-windows-x64-installer.zip
+        Start-Process Csound6_x64-windows_x86_64-6.18.0-1245.exe '/verySilent /noRestart' -Wait
+        Add-Content $Env:GITHUB_PATH "$Env:ProgramFiles\Csound6_x64\bin" -Encoding utf8
+      if: ${{ matrix.os == 'windows-2019' }}
 
     - name: Install linter-csound on macOS and Linux
       run: npm install
-      if: ${{ matrix.os != 'windows-latest' }}
+      if: ${{ matrix.os != 'windows-2019' }}
     - name: Install linter-csound on Windows
       run: |
         $Env:CL = "/I`"C:\local\boost_1_74_0`" /I`"$Env:ProgramFiles\csound\include`""
         $Env:LINK = "`"$Env:ProgramFiles\csound\lib\csound64.lib`""
         npm install
-      if: ${{ matrix.os == 'windows-latest' }}
+      if: ${{ matrix.os == 'windows-2019' }}
 
     - name: Install Jasmine
       run: npm install --global jasmine