diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index 9bb3bfc..342b977 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -28,19 +28,6 @@ jobs:
           if: runner.os == 'Linux'
           run: sudo apt-get update && sudo apt-get install -y tzdata
 
-        - name: Set dotnet install dir on Windows
-          if: runner.os == 'Windows'
-          run: echo "DOTNET_INSTALL_DIR=D:\dotnet" >> $GITHUB_ENV
-
-        - name: Install .NET SDKs
-          uses: actions/setup-dotnet@v5
-          with:
-            dotnet-version: |
-              3.1.x
-              6.0.x
-              8.0.x
-              9.0.x
-
         - name: Restore
           run: dotnet restore --nologo
 
diff --git a/.github/workflows/release.yaml b/.github/workflows/release.yaml
index 3f2e2d6..4562138 100644
--- a/.github/workflows/release.yaml
+++ b/.github/workflows/release.yaml
@@ -18,19 +18,6 @@ jobs:
         - name: Update tzdata
           run: sudo apt-get update && sudo apt-get install -y tzdata
 
-        - name: Set dotnet install dir on Windows
-          if: runner.os == 'Windows'
-          run: echo "DOTNET_INSTALL_DIR=D:\dotnet" >> $GITHUB_ENV
-
-        - name: Install .NET SDKs
-          uses: actions/setup-dotnet@v5
-          with:
-            dotnet-version: |
-              3.1.x
-              6.0.x
-              8.0.x
-              9.0.x
-
         - name: Restore
           run: dotnet restore --nologo
 
diff --git a/src/TimeZoneConverter.Posix/TimeZoneConverter.Posix.csproj b/src/TimeZoneConverter.Posix/TimeZoneConverter.Posix.csproj
index 6f25358..4bc7411 100644
--- a/src/TimeZoneConverter.Posix/TimeZoneConverter.Posix.csproj
+++ b/src/TimeZoneConverter.Posix/TimeZoneConverter.Posix.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;net462;net6.0;net8.0;net9.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;net462;net8.0;net9.0</TargetFrameworks>
     <Description>Generates a POSIX time zone string from standard time zone identifiers.</Description>
     <Authors>Matt Johnson-Pint</Authors>
     <PackageId>TimeZoneConverter.Posix</PackageId>
diff --git a/src/TimeZoneConverter/TimeZoneConverter.csproj b/src/TimeZoneConverter/TimeZoneConverter.csproj
index a13369f..3b79765 100644
--- a/src/TimeZoneConverter/TimeZoneConverter.csproj
+++ b/src/TimeZoneConverter/TimeZoneConverter.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;net462;net6.0;net8.0;net9.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;net462;net8.0;net9.0</TargetFrameworks>
     <Description>Lightweight library to convert quickly between IANA, Windows, and Rails time zone names.</Description>
     <Authors>Matt Johnson-Pint</Authors>
     <PackageId>TimeZoneConverter</PackageId>
diff --git a/test/Directory.Build.props b/test/Directory.Build.props
index 910ef5f..fd33c50 100644
--- a/test/Directory.Build.props
+++ b/test/Directory.Build.props
@@ -10,13 +10,6 @@
     </PackageReference>
     <PackageReference Include="xunit" Version="2.9.3" />
     <PackageReference Include="Xunit.SkippableFact" Version="1.5.23" />
-  </ItemGroup>
-
-  <ItemGroup Condition="'$(TargetFramework)' == 'net6.0'">
-    <PackageReference Include="Verify.Xunit" Version="28.2.1" />
-  </ItemGroup>
-
-  <ItemGroup Condition="'$(TargetFramework)' != 'net6.0'">
     <PackageReference Include="Verify.Xunit" Version="31.0.2" />
   </ItemGroup>
 
diff --git a/test/TimeZoneConverter.Posix.Tests/TimeZoneConverter.Posix.Tests.csproj b/test/TimeZoneConverter.Posix.Tests/TimeZoneConverter.Posix.Tests.csproj
index 1b760e1..675f9eb 100644
--- a/test/TimeZoneConverter.Posix.Tests/TimeZoneConverter.Posix.Tests.csproj
+++ b/test/TimeZoneConverter.Posix.Tests/TimeZoneConverter.Posix.Tests.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net6.0;net8.0;net9.0</TargetFrameworks>
+    <TargetFrameworks>net8.0;net9.0</TargetFrameworks>
     <TargetFrameworks Condition="$([MSBuild]::IsOSPlatform('Windows'))">$(TargetFrameworks);net48</TargetFrameworks>
   </PropertyGroup>
 
diff --git a/test/TimeZoneConverter.Tests/TimeZoneConverter.Tests.csproj b/test/TimeZoneConverter.Tests/TimeZoneConverter.Tests.csproj
index 8040317..9049ffb 100644
--- a/test/TimeZoneConverter.Tests/TimeZoneConverter.Tests.csproj
+++ b/test/TimeZoneConverter.Tests/TimeZoneConverter.Tests.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net6.0;net8.0;net9.0</TargetFrameworks>
+    <TargetFrameworks>net8.0;net9.0</TargetFrameworks>
     <TargetFrameworks Condition="$([MSBuild]::IsOSPlatform('Windows'))">$(TargetFrameworks);net48</TargetFrameworks>
   </PropertyGroup>