diff --git a/src/Threenine.Map.csproj b/src/Threenine.Map.csproj
index f804aab..79ebf76 100644
--- a/src/Threenine.Map.csproj
+++ b/src/Threenine.Map.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netstandard2.0</TargetFramework>
+    <TargetFramework>netstandard2.1</TargetFramework>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
     <Version>1.0.3</Version>
     <PackageRequireLicenseAcceptance>true</PackageRequireLicenseAcceptance>
diff --git a/tests/DomainObjects/DomainObjects.csproj b/tests/DomainObjects/DomainObjects.csproj
index 8456cd9..9516ee3 100644
--- a/tests/DomainObjects/DomainObjects.csproj
+++ b/tests/DomainObjects/DomainObjects.csproj
@@ -7,7 +7,7 @@
   </ItemGroup>
 
   <PropertyGroup>
-    <TargetFramework>netstandard2.0</TargetFramework>
+    <TargetFramework>netstandard2.1</TargetFramework>
   </PropertyGroup>
 
 </Project>
diff --git a/tests/EntityObjects/EntityObjects.csproj b/tests/EntityObjects/EntityObjects.csproj
index 7ac1b71..ff1942e 100644
--- a/tests/EntityObjects/EntityObjects.csproj
+++ b/tests/EntityObjects/EntityObjects.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netstandard2.0</TargetFramework>
+    <TargetFramework>netstandard2.1</TargetFramework>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/tests/MapperTests/MapperTests.csproj b/tests/MapperTests/MapperTests.csproj
index dc0ef05..96a4116 100644
--- a/tests/MapperTests/MapperTests.csproj
+++ b/tests/MapperTests/MapperTests.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netcoreapp2.0</TargetFramework>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
 
     <IsPackable>false</IsPackable>
   </PropertyGroup>