diff --git a/packages/quicktype-core/src/language/CSharp/CSharpRenderer.ts b/packages/quicktype-core/src/language/CSharp/CSharpRenderer.ts
index 09cfcc3ca..d07dea90f 100644
--- a/packages/quicktype-core/src/language/CSharp/CSharpRenderer.ts
+++ b/packages/quicktype-core/src/language/CSharp/CSharpRenderer.ts
@@ -125,7 +125,7 @@ export class CSharpRenderer extends ConvenienceRenderer {
     protected nullableCSType(t: Type, follow: (t: Type) => Type = followTargetType, withIssues = false): Sourcelike {
         t = followTargetType(t);
         const csType = this.csType(t, follow, withIssues);
-        if (isValueType(t)) {
+        if (isValueType(t) || this._csOptions.version >= 8) {
             return [csType, "?"];
         } else {
             return csType;
diff --git a/packages/quicktype-core/src/language/CSharp/SystemTextJsonCSharpRenderer.ts b/packages/quicktype-core/src/language/CSharp/SystemTextJsonCSharpRenderer.ts
index 77afed6da..dfede9be4 100644
--- a/packages/quicktype-core/src/language/CSharp/SystemTextJsonCSharpRenderer.ts
+++ b/packages/quicktype-core/src/language/CSharp/SystemTextJsonCSharpRenderer.ts
@@ -217,10 +217,13 @@ export class SystemTextJsonCSharpRenderer extends CSharpRenderer {
         const isNullable = followTargetType(property.type).isNullable;
         const isOptional = property.isOptional;
 
-        if (isOptional && !isNullable) {
+        if (!isOptional) {
+            attributes.push(["[", "JsonRequired", "]"]);
+        } else if (isOptional && !isNullable) {
             attributes.push(["[", "JsonIgnore", "(Condition = JsonIgnoreCondition.WhenWritingNull)]"]);
         }
 
+
         // const requiredClass = this._options.dense ? "R" : "Required";
         // const nullValueHandlingClass = this._options.dense ? "N" : "NullValueHandling";
         // const nullValueHandling = isOptional && !isNullable ? [", NullValueHandling = ", nullValueHandlingClass, ".Ignore"] : [];
diff --git a/packages/quicktype-core/src/language/CSharp/language.ts b/packages/quicktype-core/src/language/CSharp/language.ts
index e2b460582..123147d4c 100644
--- a/packages/quicktype-core/src/language/CSharp/language.ts
+++ b/packages/quicktype-core/src/language/CSharp/language.ts
@@ -16,7 +16,7 @@ export enum Framework {
     SystemTextJson = "SystemTextJson"
 }
 
-export type Version = 5 | 6;
+export type Version = 5 | 6 | 8;
 export interface OutputFeatures {
     attributes: boolean;
     helpers: boolean;
@@ -55,7 +55,8 @@ export const cSharpOptions = {
         "C# version",
         [
             ["5", 5],
-            ["6", 6]
+            ["6", 6],
+            ["8", 8]
         ],
         "6",
         "secondary"