diff --git a/src/GameCult.Caching.MessagePack/GameCult.Caching.MessagePack.csproj b/src/GameCult.Caching.MessagePack/GameCult.Caching.MessagePack.csproj
index 63cbf614..0afdd0d3 100644
--- a/src/GameCult.Caching.MessagePack/GameCult.Caching.MessagePack.csproj
+++ b/src/GameCult.Caching.MessagePack/GameCult.Caching.MessagePack.csproj
@@ -8,7 +8,7 @@
     <ProjectReference Include="..\GameCult.Caching\GameCult.Caching.csproj" />
     <ProjectReference Include="..\..\packages\cultmath\src\CultMath\CultMath.csproj" />
     <PackageReference Include="MessagePack" Version="3.1.7" />
-    <PackageReference Include="System.Text.Json" Version="9.0.10" />
+    <PackageReference Include="System.Text.Json" Version="8.0.5" />
     <PackageReference Include="MessagePackAnalyzer" Version="3.1.7" PrivateAssets="all" />
     <InternalsVisibleTo Include="GameCult.Caching.Tests" />
     <InternalsVisibleTo Include="GameCult.Caching.GeneratorConsumer" />
diff --git a/src/GameCult.Geometry/GameCult.Geometry.csproj b/src/GameCult.Geometry/GameCult.Geometry.csproj
index 9736e1b7..744bd109 100644
--- a/src/GameCult.Geometry/GameCult.Geometry.csproj
+++ b/src/GameCult.Geometry/GameCult.Geometry.csproj
@@ -12,7 +12,7 @@
     <ProjectReference Include="..\GameCult.Caching\GameCult.Caching.csproj" />
     <ProjectReference Include="..\GameCult.Caching.MessagePack\GameCult.Caching.MessagePack.csproj" />
     <PackageReference Include="MessagePack" Version="3.1.7" />
-    <PackageReference Include="System.Text.Json" Version="9.0.10" />
+    <PackageReference Include="System.Text.Json" Version="8.0.5" />
   </ItemGroup>
 
   <Import Project="..\GameCult.Caching.MessagePack\buildTransitive\GameCult.Caching.MessagePack.targets" />
diff --git a/src/GameCult.Networking/GameCult.Networking.csproj b/src/GameCult.Networking/GameCult.Networking.csproj
index 08ef2ed6..68e13794 100644
--- a/src/GameCult.Networking/GameCult.Networking.csproj
+++ b/src/GameCult.Networking/GameCult.Networking.csproj
@@ -9,7 +9,7 @@
     <ProjectReference Include="..\GameCult.Caching.MessagePack\GameCult.Caching.MessagePack.csproj" />
     <PackageReference Include="MessagePack" Version="3.1.7" />
     <PackageReference Include="MessagePackAnalyzer" Version="3.1.7" PrivateAssets="all" />
-    <PackageReference Include="System.Text.Json" Version="9.0.10" />
+    <PackageReference Include="System.Text.Json" Version="8.0.5" />
     <PackageReference Include="R3" Version="1.3.0" />
     <PackageReference Include="LiteNetLib" Version="2.1.2" />
     <PackageReference Include="Isopoh.Cryptography.Argon2" Version="2.0.0" />