diff --git a/docker-compose.yml b/docker-compose.yml
index 000266d..8f2a4d1 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -3,7 +3,6 @@ version: '3.7'
 services:
   postgres:
     image: "postgres:latest"
-    container_name: further-postgres
     hostname: postgres
     user: postgres
     restart: always
diff --git a/prisma/schema.prisma b/prisma/schema.prisma
index 75439f2..5bb8bd6 100644
--- a/prisma/schema.prisma
+++ b/prisma/schema.prisma
@@ -49,4 +49,5 @@ model Profile {
   age    Int?
   user   User    @relation(fields: [userId], references: [id])
   userId Int     @unique
+  meta   Json?
 }
diff --git a/src/lib/utils/cloneParams.ts b/src/lib/utils/cloneParams.ts
new file mode 100644
index 0000000..d738253
--- /dev/null
+++ b/src/lib/utils/cloneParams.ts
@@ -0,0 +1,26 @@
+import { Prisma } from "@prisma/client";
+import { cloneDeep, cloneDeepWith } from "lodash";
+
+import { NestedParams } from "../types";
+
+// Prisma v4 requires that instances of Prisma.NullTypes are not cloned,
+// otherwise it will parse them as 'undefined' and the operation will fail.
+function passThroughNullTypes(value: any) {
+  if (
+    value instanceof Prisma.NullTypes.DbNull ||
+    value instanceof Prisma.NullTypes.JsonNull ||
+    value instanceof Prisma.NullTypes.AnyNull
+  ) {
+    return value;
+  }
+}
+
+export function cloneParams(params: NestedParams) {
+  // only handle null types if they are present, Prisma versions lower than v4
+  // do not have them and we can clone the string values as usual
+  if (Prisma.NullTypes) {
+    return cloneDeepWith(params, passThroughNullTypes);
+  }
+
+  return cloneDeep(params);
+}
diff --git a/src/lib/utils/execution.ts b/src/lib/utils/execution.ts
index ef87111..2603199 100644
--- a/src/lib/utils/execution.ts
+++ b/src/lib/utils/execution.ts
@@ -1,6 +1,5 @@
 import { DeferredPromise } from "@open-draft/deferred-promise";
 import { omit } from "lodash";
-import cloneDeep from "lodash/cloneDeep";
 
 import {
   MiddlewareCall,
@@ -8,6 +7,7 @@ import {
   NestedParams,
   Target,
 } from "../types";
+import { cloneParams } from "./cloneParams";
 
 export async function executeMiddleware(
   middleware: NestedMiddleware,
@@ -19,7 +19,7 @@ export async function executeMiddleware(
   >();
   const nextPromise = new DeferredPromise<any>();
 
-  const result = middleware(cloneDeep(params), (updatedParams) => {
+  const result = middleware(cloneParams(params), (updatedParams) => {
     paramsUpdatedPromise.resolve(updatedParams);
     return nextPromise;
   }).catch((e) => {
diff --git a/src/lib/utils/params.ts b/src/lib/utils/params.ts
index 2c37563..9516ec3 100644
--- a/src/lib/utils/params.ts
+++ b/src/lib/utils/params.ts
@@ -2,7 +2,6 @@ import set from "lodash/set";
 import get from "lodash/get";
 import unset from "lodash/unset";
 import merge from "lodash/merge";
-import cloneDeep from "lodash/cloneDeep";
 import { omit } from "lodash";
 
 import {
@@ -32,6 +31,7 @@ import {
   toOneRelationNonListActions,
 } from "./actions";
 import { fieldsByWriteAction } from "./extractNestedActions";
+import { cloneParams } from "./cloneParams";
 
 function addWriteArgsToParams(
   params: NestedParams,
@@ -159,7 +159,7 @@ export function buildParamsFromCalls(
   calls: MiddlewareCall[],
   parentParams: NestedParams
 ) {
-  const finalParams = cloneDeep(parentParams);
+  const finalParams = cloneParams(parentParams);
 
   // calls should update the parent calls updated params
 
diff --git a/test/e2e/smoke.test.ts b/test/e2e/smoke.test.ts
index d2c97f3..68a623c 100644
--- a/test/e2e/smoke.test.ts
+++ b/test/e2e/smoke.test.ts
@@ -1,4 +1,4 @@
-import { Post, PrismaClient, User } from "@prisma/client";
+import { Post, Prisma, PrismaClient, User } from "@prisma/client";
 import faker from "faker";
 
 import { createNestedMiddleware } from "../../src";
@@ -131,6 +131,26 @@ describe("smoke", () => {
         },
       });
       expect(updatedComment).not.toBeNull();
+
+      // supports Json null values
+      await testClient.profile.create({
+        data: {
+          userId: secondUser.id,
+          meta: Prisma.DbNull,
+        },
+      });
+
+      const profile = await testClient.profile.findFirst({
+        where: {
+          OR: [
+            { meta: { equals: Prisma.AnyNull } },
+            { meta: { equals: Prisma.DbNull } },
+            { meta: { equals: Prisma.JsonNull } },
+          ],
+        },
+      });
+      expect(profile).not.toBeNull();
+      expect(profile!.meta).toBe(null);
     });
   });
 });
diff --git a/test/unit/args.test.ts b/test/unit/args.test.ts
index 55c5c9f..8e241c2 100644
--- a/test/unit/args.test.ts
+++ b/test/unit/args.test.ts
@@ -1,3 +1,4 @@
+import { Prisma } from "@prisma/client";
 import faker from "faker";
 import { set } from "lodash";
 
@@ -27,6 +28,32 @@ describe("params", () => {
     expect(params.args.data.posts.create).not.toHaveProperty("test");
   });
 
+  it("passes through instances of Prisma.NullTypes to next", async () => {
+    const nestedMiddleware = createNestedMiddleware((params, next) => {
+      return next(params);
+    });
+
+    const next = jest.fn((_: any) => Promise.resolve(null));
+    const params = createParams("Profile", "findFirst", {
+      where: {
+        OR: [
+          { meta: { equals: Prisma.JsonNull } },
+          { meta: { equals: Prisma.DbNull } },
+          { meta: { equals: Prisma.AnyNull } },
+        ],
+      },
+    });
+    await nestedMiddleware(params, next);
+
+    expect(next).toHaveBeenCalledWith(params);
+    expect(next.mock.calls[0][0].args.where.OR).toHaveLength(3);
+    next.mock.calls[0][0].args.where.OR.forEach(
+      ({ meta }: any, index: number) => {
+        expect(meta.equals).toBe(params.args.where.OR[index].meta.equals);
+      }
+    );
+  });
+
   it("allows middleware to modify root args", async () => {
     const nestedMiddleware = createNestedMiddleware((params, next) => {
       return next({