diff --git a/packages/slice-machine/src/legacy/components/Forms/CreateCustomTypeModal/CreateCustomTypeModal.tsx b/packages/slice-machine/src/legacy/components/Forms/CreateCustomTypeModal/CreateCustomTypeModal.tsx
index b291f2d7f9..cbdbaebd6b 100644
--- a/packages/slice-machine/src/legacy/components/Forms/CreateCustomTypeModal/CreateCustomTypeModal.tsx
+++ b/packages/slice-machine/src/legacy/components/Forms/CreateCustomTypeModal/CreateCustomTypeModal.tsx
@@ -165,6 +165,10 @@ export const CreateCustomTypeModal: React.FC<CreateCustomTypeModalProps> = ({
           })} name is already taken.`;
         }
 
+        if (["update", "insert"].includes(label.toLowerCase())) {
+          errors.label = `Name "${label}" is reserved for Slice Machine use.`;
+        }
+
         if (!id || !id.length) {
           errors.id = "ID cannot be empty.";
         }
diff --git a/packages/slice-machine/src/legacy/components/Forms/formsValidator.ts b/packages/slice-machine/src/legacy/components/Forms/formsValidator.ts
index 7c884164d1..3d5f304cfd 100644
--- a/packages/slice-machine/src/legacy/components/Forms/formsValidator.ts
+++ b/packages/slice-machine/src/legacy/components/Forms/formsValidator.ts
@@ -21,21 +21,21 @@ export function validateSliceModalValues(
   if (!sliceName) {
     return { sliceName: "Cannot be empty" };
   }
+  if (RESERVED_SLICE_NAME.includes(sliceName.toLowerCase())) {
+    return {
+      sliceName: `Name "${sliceName}" is reserved for Slice Machine use.`,
+    };
+  }
   if (!API_ID_REGEX.exec(sliceName)) {
-    return { sliceName: "No special characters allowed" };
+    return { sliceName: "No special characters allowed." };
   }
   const cased = startCase(camelCase(sliceName)).replace(/\s/gm, "");
   if (cased !== sliceName.trim()) {
-    return { sliceName: "Value has to be PascalCased" };
+    return { sliceName: "Value has to be PascalCased." };
   }
   // See: #599
   if (sliceName.match(/^\d/)) {
-    return { sliceName: "Value cannot start with a number" };
-  }
-  if (RESERVED_SLICE_NAME.includes(sliceName)) {
-    return {
-      sliceName: `${sliceName} is reserved for Slice Machine use`,
-    };
+    return { sliceName: "Value cannot start with a number." };
   }
 
   const localNames = localLibs.flatMap((lib) =>
diff --git a/packages/slice-machine/src/legacy/lib/consts.ts b/packages/slice-machine/src/legacy/lib/consts.ts
index cf6b349261..6157f54b6d 100644
--- a/packages/slice-machine/src/legacy/lib/consts.ts
+++ b/packages/slice-machine/src/legacy/lib/consts.ts
@@ -1,5 +1,5 @@
 // A list of slice names that are reserved for internal uses.
-export const RESERVED_SLICE_NAME = ["components"];
+export const RESERVED_SLICE_NAME = ["components", "update", "insert"];
 
 export const acceptedImagesTypes = ["png", "jpg", "jpeg"];
 
diff --git a/playwright/tests/customTypes/customTypesTable.spec.ts b/playwright/tests/customTypes/customTypesTable.spec.ts
index c1d15142e0..654d88b83f 100644
--- a/playwright/tests/customTypes/customTypesTable.spec.ts
+++ b/playwright/tests/customTypes/customTypesTable.spec.ts
@@ -63,6 +63,27 @@ test("I cannot create a custom type with a name or id already used", async ({
   ).toBeDisabled();
 });
 
+test("I cannot create a custom type with a name update or insert", async ({
+  customTypesTablePage,
+}) => {
+  await customTypesTablePage.goto();
+  await customTypesTablePage.openCreateDialog();
+
+  await expect(customTypesTablePage.createTypeDialog.title).toBeVisible();
+  await customTypesTablePage.createTypeDialog.nameInput.fill(
+    "update",
+  );
+  await expect(
+    customTypesTablePage.createTypeDialog.submitButton,
+  ).toBeDisabled();
+  await customTypesTablePage.createTypeDialog.nameInput.fill(
+    "insert",
+  );
+  await expect(
+    customTypesTablePage.createTypeDialog.submitButton,
+  ).toBeDisabled();
+});
+
 test("I can rename a custom type", async ({
   reusableCustomType,
   customTypesTablePage,
diff --git a/playwright/tests/pageTypes/pageTypesTable.spec.ts b/playwright/tests/pageTypes/pageTypesTable.spec.ts
index ae20da3c47..6f49f7ea1e 100644
--- a/playwright/tests/pageTypes/pageTypesTable.spec.ts
+++ b/playwright/tests/pageTypes/pageTypesTable.spec.ts
@@ -89,6 +89,23 @@ test("I cannot create a page type with a name or id already used", async ({
   await expect(pageTypesTablePage.createTypeDialog.submitButton).toBeDisabled();
 });
 
+test("I cannot create a page type with a name update or insert", async ({
+  pageTypesTablePage,
+}) => {
+  await pageTypesTablePage.goto();
+  await pageTypesTablePage.openCreateDialog();
+
+  await expect(pageTypesTablePage.createTypeDialog.title).toBeVisible();
+  await pageTypesTablePage.createTypeDialog.nameInput.fill(
+    "update",
+  );
+  await expect(pageTypesTablePage.createTypeDialog.submitButton).toBeDisabled();
+  await pageTypesTablePage.createTypeDialog.nameInput.fill(
+    "insert",
+  );
+  await expect(pageTypesTablePage.createTypeDialog.submitButton).toBeDisabled();
+});
+
 test("I can rename a page type", async ({
   pageTypesTablePage,
   reusablePageType,
diff --git a/playwright/tests/slices/slicesList.spec.ts b/playwright/tests/slices/slicesList.spec.ts
index a57228ef1f..e40e5384aa 100644
--- a/playwright/tests/slices/slicesList.spec.ts
+++ b/playwright/tests/slices/slicesList.spec.ts
@@ -147,6 +147,23 @@ test("I cannot rename a slice with a name starting with a number", async ({
   await expect(slicesListPage.renameSliceDialog.submitButton).toBeDisabled();
 });
 
+test("I cannot create a slice with a restricted name ", async ({
+  slicesListPage,
+}) => {
+  await slicesListPage.goto();
+  await slicesListPage.openCreateDialog();
+
+  const { nameInput, submitButton } = slicesListPage.createSliceDialog;
+
+  await nameInput.fill("components");
+  await expect(submitButton).toBeDisabled();
+  await nameInput.fill("update");
+  await expect(submitButton).toBeDisabled();
+  await nameInput.fill("insert");
+  await expect(submitButton).toBeDisabled();
+
+});
+
 test("I cannot create two slices with the same name", async ({
   sliceBuilderPage,
   slicesListPage,