diff --git a/CHANGELOG.md b/CHANGELOG.md
index 05f54a1..16746e0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,9 @@ The `Unreleased` section name is replaced by the expected version of next releas
 
 ### Added
 ### Changed
+
+- `SystemTextJson`: Upped minimum `System.Text.Json` version to `10.0.` [#129](https://github.com/jet/FsCodec/pull/129)
+
 ### Removed
 ### Fixed
 
diff --git a/src/FsCodec.SystemTextJson/FsCodec.SystemTextJson.fsproj b/src/FsCodec.SystemTextJson/FsCodec.SystemTextJson.fsproj
index 1314d2f..2b74d01 100644
--- a/src/FsCodec.SystemTextJson/FsCodec.SystemTextJson.fsproj
+++ b/src/FsCodec.SystemTextJson/FsCodec.SystemTextJson.fsproj
@@ -27,7 +27,7 @@
 
     <PackageReference Include="FSharp.Core" Version="4.5.4" />
 
-    <PackageReference Include="System.Text.Json" Version="6.0.10" />
+    <PackageReference Include="System.Text.Json" Version="10.0.0-rc.2.25502.107" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/FsCodec.SystemTextJson/Interop.fs b/src/FsCodec.SystemTextJson/Interop.fs
index 5230d1c..d3a4700 100644
--- a/src/FsCodec.SystemTextJson/Interop.fs
+++ b/src/FsCodec.SystemTextJson/Interop.fs
@@ -4,12 +4,12 @@ open System
 open System.Runtime.CompilerServices
 open System.Text.Json
 
-[<Extension; AbstractClass; Sealed>]
+[<AbstractClass; Sealed>]
 type InteropHelpers private () =
 
     static member Utf8ToJsonElement(x: ReadOnlyMemory<byte>): JsonElement =
         if x.IsEmpty then JsonElement()
-        else JsonSerializer.Deserialize<JsonElement>(x.Span)
+        else JsonElement.Parse x.Span
 
     static member JsonElementToUtf8(x: JsonElement): ReadOnlyMemory<byte> =
         if x.ValueKind = JsonValueKind.Undefined then ReadOnlyMemory.Empty