diff --git a/src/ThisAssembly.AssemblyInfo/ThisAssembly.AssemblyInfo.csproj b/src/ThisAssembly.AssemblyInfo/ThisAssembly.AssemblyInfo.csproj
index 7daed1db..8f3825d2 100644
--- a/src/ThisAssembly.AssemblyInfo/ThisAssembly.AssemblyInfo.csproj
+++ b/src/ThisAssembly.AssemblyInfo/ThisAssembly.AssemblyInfo.csproj
@@ -35,7 +35,7 @@ on the `ThisAssembly.Info` class.
     <PackageReference Include="Microsoft.CSharp" Version="4.7.0" />
     <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.4" />
     
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.3.1" Pack="false" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.0.1" Pack="false" />
     <PackageReference Include="PolySharp" Version="1.12.1" PrivateAssets="All" />
   </ItemGroup>
 
diff --git a/src/ThisAssembly.Constants/ThisAssembly.Constants.csproj b/src/ThisAssembly.Constants/ThisAssembly.Constants.csproj
index 17e68a43..262f493c 100644
--- a/src/ThisAssembly.Constants/ThisAssembly.Constants.csproj
+++ b/src/ThisAssembly.Constants/ThisAssembly.Constants.csproj
@@ -55,7 +55,7 @@ C#:
     <PackageReference Include="Microsoft.CSharp" Version="4.7.0" />
     <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.4" />
 
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.3.1" Pack="false" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.0.1" Pack="false" />
     <PackageReference Include="PolySharp" Version="1.12.1" PrivateAssets="All" />
   </ItemGroup>
 
diff --git a/src/ThisAssembly.Metadata/ThisAssembly.Metadata.csproj b/src/ThisAssembly.Metadata/ThisAssembly.Metadata.csproj
index 28e9fd78..ccb00c6c 100644
--- a/src/ThisAssembly.Metadata/ThisAssembly.Metadata.csproj
+++ b/src/ThisAssembly.Metadata/ThisAssembly.Metadata.csproj
@@ -47,7 +47,7 @@ C#:
     <PackageReference Include="Microsoft.CSharp" Version="4.7.0" />
     <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.4" />
 
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.3.1" Pack="false" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.0.1" Pack="false" />
     <PackageReference Include="PolySharp" Version="1.12.1" PrivateAssets="All" />
   </ItemGroup>
 
diff --git a/src/ThisAssembly.Project/ThisAssembly.Project.csproj b/src/ThisAssembly.Project/ThisAssembly.Project.csproj
index 13d1da1a..833d2829 100644
--- a/src/ThisAssembly.Project/ThisAssembly.Project.csproj
+++ b/src/ThisAssembly.Project/ThisAssembly.Project.csproj
@@ -46,7 +46,7 @@ C#:
     <PackageReference Include="Microsoft.CSharp" Version="4.7.0" />
     <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.4" />
 
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.3.1" Pack="false" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.0.1" Pack="false" />
     <PackageReference Include="PolySharp" Version="1.12.1" PrivateAssets="All" />
   </ItemGroup>
 
diff --git a/src/ThisAssembly.Resources/ThisAssembly.Resources.csproj b/src/ThisAssembly.Resources/ThisAssembly.Resources.csproj
index 2ef63a31..75333d45 100644
--- a/src/ThisAssembly.Resources/ThisAssembly.Resources.csproj
+++ b/src/ThisAssembly.Resources/ThisAssembly.Resources.csproj
@@ -31,7 +31,7 @@
     <PackageReference Include="Microsoft.CSharp" Version="4.7.0" />
     <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.4" />
 
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.3.1" Pack="false" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.0.1" Pack="false" />
     <PackageReference Include="PolySharp" Version="1.12.1" PrivateAssets="All" />
   </ItemGroup>
 
diff --git a/src/ThisAssembly.Strings/ThisAssembly.Strings.csproj b/src/ThisAssembly.Strings/ThisAssembly.Strings.csproj
index 1cb981b7..c50909e5 100644
--- a/src/ThisAssembly.Strings/ThisAssembly.Strings.csproj
+++ b/src/ThisAssembly.Strings/ThisAssembly.Strings.csproj
@@ -32,7 +32,7 @@ such as "Hello {name}".
     <PackageReference Include="Microsoft.CSharp" Version="4.7.0" />
     <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.4" />
 
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.3.1" Pack="false" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.0.1" Pack="false" />
     <PackageReference Include="PolySharp" Version="1.12.1" PrivateAssets="All" />
   </ItemGroup>
 
diff --git a/src/ThisAssembly.Tests/ThisAssembly.Tests.csproj b/src/ThisAssembly.Tests/ThisAssembly.Tests.csproj
index f204305d..3324c474 100644
--- a/src/ThisAssembly.Tests/ThisAssembly.Tests.csproj
+++ b/src/ThisAssembly.Tests/ThisAssembly.Tests.csproj
@@ -27,7 +27,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.1.1" PrivateAssets="all" />
     <PackageReference Include="PolySharp" Version="1.12.1" PrivateAssets="All" />
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.3.1" Pack="false" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.0.1" Pack="false" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.1" />
     <PackageReference Include="xunit" Version="2.4.2" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.5" />