diff --git a/packages/eslint-plugin-pf-codemods/index.js b/packages/eslint-plugin-pf-codemods/index.js
index 65f85756f..d19f950f4 100644
--- a/packages/eslint-plugin-pf-codemods/index.js
+++ b/packages/eslint-plugin-pf-codemods/index.js
@@ -16,6 +16,7 @@ const v4rules = createListOfRules("4");
 const warningRules = [
   "applicationLauncher-warn-input",
   "card-warn-component",
+  "datePicker-warn-appendTo-default-value-changed",
   "horizontalSubnav-ariaLabel",
   "popover-appendTo-default",
   "react-dropzone-warn-upgrade",
diff --git a/packages/eslint-plugin-pf-codemods/lib/rules/v5/datePicker-warn-appendTo-default-value-changed.js b/packages/eslint-plugin-pf-codemods/lib/rules/v5/datePicker-warn-appendTo-default-value-changed.js
new file mode 100644
index 000000000..5ddb9f248
--- /dev/null
+++ b/packages/eslint-plugin-pf-codemods/lib/rules/v5/datePicker-warn-appendTo-default-value-changed.js
@@ -0,0 +1,29 @@
+const { getPackageImports } = require("../../helpers");
+
+  // https://github.com/patternfly/patternfly-react/pull/8636
+  module.exports = {
+    meta: {},
+    create: function (context) {
+      const imports = getPackageImports(
+        context,
+        "@patternfly/react-core"
+      ).filter((specifier) => specifier.imported.name === "DatePicker");
+
+      return imports.length === 0
+        ? {}
+        : {
+            JSXOpeningElement(node) {
+              if (
+                imports
+                  .map((imp) => imp.local.name)
+                  .includes(node.name.name)
+              ) {
+                context.report({
+                  node,
+                  message: 'The default value of the DatePicker prop "appendTo" has been updated to a value of "inline" and may cause markup changes that require updating selectors used in tests.',
+                });
+              }
+            },
+          };
+    },
+  };
diff --git a/packages/eslint-plugin-pf-codemods/test/rules/v5/datePicker-warn-appendTo-default-value-changed.js b/packages/eslint-plugin-pf-codemods/test/rules/v5/datePicker-warn-appendTo-default-value-changed.js
new file mode 100644
index 000000000..fe6619659
--- /dev/null
+++ b/packages/eslint-plugin-pf-codemods/test/rules/v5/datePicker-warn-appendTo-default-value-changed.js
@@ -0,0 +1,21 @@
+const ruleTester = require('../../ruletester');
+const rule = require('../../../lib/rules/v5/datePicker-warn-appendTo-default-value-changed');
+
+ruleTester.run("datePicker-warn-appendTo-default-value-changed", rule, {
+  valid: [
+    {
+      // No @patternfly/react-core import
+      code: `<DatePicker />`,
+    }
+  ],
+  invalid: [
+    {
+      code:   `import { DatePicker } from '@patternfly/react-core'; <DatePicker />`,
+      output: `import { DatePicker } from '@patternfly/react-core'; <DatePicker />`,
+      errors: [{
+        message: 'The default value of the DatePicker prop "appendTo" has been updated to a value of "inline" and may cause markup changes that require updating selectors used in tests.',
+        type: "JSXOpeningElement",
+      }]
+    }
+  ]
+});
diff --git a/packages/pf-codemods/README.md b/packages/pf-codemods/README.md
index 4e123d653..c3f36a2b9 100644
--- a/packages/pf-codemods/README.md
+++ b/packages/pf-codemods/README.md
@@ -266,6 +266,10 @@ Out:
 <DataList  />
 ```
 
+### datePicker-warn-appendTo-default-value-changed [(#8636)](https://github.com/patternfly/patternfly-react/pull/8636)
+
+The default value of the `appendTo` prop on DatePicker has been updated, which may cause markup changes that require updating selectors in tests. This rule will raise a warning, but will not make any changes.
+
 ### divider-remove-isVertical [(#8199)](https://github.com/patternfly/patternfly-react/pull/8199)
 
 We've replaced the `isVertical` flag with the `orientation` property that can define verticality on different breakpoints.
diff --git a/test/test.tsx b/test/test.tsx
index 95fb78cb2..19b519f09 100644
--- a/test/test.tsx
+++ b/test/test.tsx
@@ -5,6 +5,7 @@ import {
   ApplicationLauncher,
   Button,
   Card,
+  DatePicker,
   DropdownItem,
   DropdownToggle,
   FileUpload,
@@ -28,6 +29,7 @@ const isRead = true;
   <Alert aria-label='tester' />
   <Button isLarge />
   <Button isSmall />
+  <DatePicker />
   <DropdownItem isHovered={true} />
   <DropdownToggle isPrimary />
   <MenuItem hasCheck />