diff --git a/nbformat/v4/nbformat.v4.schema.json b/nbformat/v4/nbformat.v4.schema.json
index 670bbd35..68383b0f 100644
--- a/nbformat/v4/nbformat.v4.schema.json
+++ b/nbformat/v4/nbformat.v4.schema.json
@@ -141,6 +141,15 @@
                 "type": "boolean"
               }
             },
+            "editable": {
+              "description": "Whether the cell is editable.",
+              "type": "boolean"
+            },
+            "deletable": {
+              "description": "Whether the cell is deletable.",
+              "type": "boolean"
+            },
+            "slideshow": { "$ref": "#/definitions/misc/metadata_slideshow" },
             "name": { "$ref": "#/definitions/misc/metadata_name" },
             "tags": { "$ref": "#/definitions/misc/metadata_tags" }
           }
@@ -167,6 +176,15 @@
           "properties": {
             "name": { "$ref": "#/definitions/misc/metadata_name" },
             "tags": { "$ref": "#/definitions/misc/metadata_tags" },
+            "editable": {
+              "description": "Whether the cell is editable.",
+              "type": "boolean"
+            },
+            "deletable": {
+              "description": "Whether the cell is deletable.",
+              "type": "boolean"
+            },
+            "slideshow": { "$ref": "#/definitions/misc/metadata_slideshow" },
             "jupyter": {
               "description": "Official Jupyter Metadata for Markdown Cells",
               "type": "object",
@@ -256,6 +274,15 @@
               "description": "Whether the cell's output is scrolled, unscrolled, or autoscrolled.",
               "enum": [true, false, "auto"]
             },
+            "editable": {
+              "description": "Whether the cell is editable.",
+              "type": "boolean"
+            },
+            "deletable": {
+              "description": "Whether the cell is deletable.",
+              "type": "boolean"
+            },
+            "slideshow": { "$ref": "#/definitions/misc/metadata_slideshow" },
             "name": { "$ref": "#/definitions/misc/metadata_name" },
             "tags": { "$ref": "#/definitions/misc/metadata_tags" }
           }
@@ -291,7 +318,16 @@
           "type": "object",
           "properties": {
             "name": { "$ref": "#/definitions/misc/metadata_name" },
-            "tags": { "$ref": "#/definitions/misc/metadata_tags" }
+            "tags": { "$ref": "#/definitions/misc/metadata_tags" },
+            "editable": {
+              "description": "Whether the cell is editable.",
+              "type": "boolean"
+            },
+            "deletable": {
+              "description": "Whether the cell is deletable.",
+              "type": "boolean"
+            },
+            "slideshow": { "$ref": "#/definitions/misc/metadata_slideshow" }
           },
           "additionalProperties": true
         }
@@ -420,6 +456,18 @@
           "pattern": "^[^,]+$"
         }
       },
+      "metadata_slideshow": {
+        "description": "Slideshow-specific cell metadata.",
+        "type": "object",
+        "additionalProperties": true,
+        "properties": {
+          "slide_type": {
+            "description": "Type of slide.",
+            "type": "string",
+            "enum": ["slide", "subslide", "fragment", "skip", "notes", "-", ""]
+          }
+        }
+      },
       "attachments": {
         "description": "Media attachments (e.g. inline images), stored as mimebundle keyed by filename.",
         "type": "object",
diff --git a/tests/test4_with_cell_metadata.ipynb b/tests/test4_with_cell_metadata.ipynb
new file mode 100644
index 00000000..eadb5350
--- /dev/null
+++ b/tests/test4_with_cell_metadata.ipynb
@@ -0,0 +1,72 @@
+{
+ "cells": [
+  {
+   "id": "cell1",
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {
+    "editable": true,
+    "deletable": false,
+    "slideshow": {
+     "slide_type": "slide"
+    },
+    "tags": [
+     "solution"
+    ]
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Hello, World!\n"
+     ]
+    }
+   ],
+   "source": [
+    "print('Hello, World!')"
+   ]
+  },
+  {
+   "id": "cell2",
+   "cell_type": "markdown",
+   "metadata": {
+    "editable": false,
+    "deletable": true,
+    "slideshow": {
+     "slide_type": "subslide"
+    }
+   },
+   "source": [
+    "# Test Markdown Cell"
+   ]
+  },
+  {
+   "id": "cell3",
+   "cell_type": "raw",
+   "metadata": {
+    "editable": true,
+    "slideshow": {
+     "slide_type": "fragment"
+    },
+    "tags": [
+     "raw-data"
+    ]
+   },
+   "source": [
+    "Raw text content"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "name": "python3",
+   "display_name": "Python 3"
+  },
+  "language_info": {
+   "name": "python"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}
diff --git a/tests/test_validator.py b/tests/test_validator.py
index ba7fd5ef..2ae0b526 100644
--- a/tests/test_validator.py
+++ b/tests/test_validator.py
@@ -178,6 +178,16 @@ def test_nb4jupyter_metadata_timings(validator_name):
     assert isvalid(nb)
 
 
+@pytest.mark.parametrize("validator_name", VALIDATORS)
+def test_nb4_with_cell_metadata(validator_name):
+    """Test that a notebook with editable, deletable, and slideshow metadata passes validation"""
+    set_validator(validator_name)
+    with TestsBase.fopen("test4_with_cell_metadata.ipynb", "r") as f:
+        nb = read(f, as_version=4)
+    validate(nb)
+    assert isvalid(nb)
+
+
 @pytest.mark.parametrize("validator_name", VALIDATORS)
 def test_invalid(validator_name):
     """Test than an invalid notebook does not pass validation"""
diff --git a/tests/v4_5_invalid_metadata.ipynb b/tests/v4_5_invalid_metadata.ipynb
index d96de051..9a4796d4 100644
--- a/tests/v4_5_invalid_metadata.ipynb
+++ b/tests/v4_5_invalid_metadata.ipynb
@@ -13,7 +13,8 @@
     "name": 12345,
     "tags": "BAD: should be list of str",
     "jupyter": "BAD: should be dict",
-    "execution": "BAD: should be dict"
+    "execution": "BAD: should be dict",
+    "slideshow": "BAD: should be dict"
    },
    "outputs": [
     {