diff --git a/.github/workflows/build-test.yml b/.github/workflows/build-test.yml
index a77a0e278..7ab99718a 100644
--- a/.github/workflows/build-test.yml
+++ b/.github/workflows/build-test.yml
@@ -19,17 +19,17 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        target: [netstandard2.0, netstandard2.1, net6.0]
+        target: [netstandard2.0, netstandard2.1, net6.0, net462]
     env:
       LIB_PROJ: src/ICSharpCode.SharpZipLib/ICSharpCode.SharpZipLib.csproj
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         ref: ${{ github.events.inputs.tag }}
         fetch-depth: 0
 
     - name: Setup .NET
-      uses: actions/setup-dotnet@v1
+      uses: actions/setup-dotnet@v4
       with:
         dotnet-version: '6.0.x'
         
@@ -51,13 +51,13 @@ jobs:
         os: [ubuntu, macos]
         target: [net6.0]
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
       with:
         fetch-depth: 0
 
     - name: Setup .NET Core
       if: matrix.target == 'net6.0'
-      uses: actions/setup-dotnet@v1
+      uses: actions/setup-dotnet@v4
       with:
         dotnet-version: '6.0.x'
 
@@ -79,12 +79,12 @@ jobs:
       DOTCOVER_PKG: jetbrains.dotcover.commandlinetools
       COVER_SNAPSHOT: SharpZipLib.dcvr
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         fetch-depth: 0
         
     - name: Setup .NET
-      uses: actions/setup-dotnet@v1
+      uses: actions/setup-dotnet@v4
       with:
         dotnet-version: '6.0.x'
         
@@ -105,12 +105,12 @@ jobs:
       run: dotcover report --source=${{env.COVER_SNAPSHOT}} --reporttype=detailedxml --output=dotcover-report.xml
   
     - name: Upload coverage to Codecov
-      uses: codecov/codecov-action@v1.2.2
+      uses: codecov/codecov-action@v4
       with:
         files: dotcover-report.xml
         
     - name: Upload coverage snapshot artifact
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v4
       with:
         name: Code coverage snapshot
         path: ${{env.COVER_SNAPSHOT}}
@@ -124,13 +124,13 @@ jobs:
       PKG_PROPS: '/p:ContinuousIntegrationBuild=true /p:EmbedUntrackedSources=true'
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
       with:
         ref: ${{ github.events.inputs.tag }}
         fetch-depth: 0
       
     - name: Setup .NET Core
-      uses: actions/setup-dotnet@v1
+      uses: actions/setup-dotnet@v4
       with:
         dotnet-version: '6.0.x'
         
@@ -159,7 +159,7 @@ jobs:
       run: dotnet pack ${{ env.PKG_PROJ }} -c Release --output dist ${{ env.PKG_PROPS }} /p:Version=${{ env.PKG_VERSION }}
 
     - name: Upload nuget package artifact
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v4
       with:
         name: Nuget package
         path: dist/*.nupkg
diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index 54ce5b08b..fa0443ccc 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -39,7 +39,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index bb6f67445..3f772744d 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -16,12 +16,12 @@ jobs:
     runs-on: windows-latest
     name: Generate DocFX documentation
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         ref: ${{ github.events.inputs.tag }}
         
     - name: Setup .NET
-      uses: actions/setup-dotnet@v1
+      uses: actions/setup-dotnet@v4
       with:
         dotnet-version: '6.0.x'
         
@@ -35,7 +35,7 @@ jobs:
       run: docfx docs/help/docfx.json --warningsAsErrors
 
     - name: Upload documentation as artifact
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v4
       with:
         name: site
         path: docs/help/_site
@@ -46,10 +46,10 @@ jobs:
     name: Update github pages docs 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Download Artifacts # The built project is downloaded into the 'site' folder.
-        uses: actions/download-artifact@v1
+        uses: actions/download-artifact@v4
         with:
           name: site