diff --git a/lib/Controller/AdminGroupController.php b/lib/Controller/AdminGroupController.php
index e8edce0..700319e 100644
--- a/lib/Controller/AdminGroupController.php
+++ b/lib/Controller/AdminGroupController.php
@@ -117,6 +117,37 @@ public function setEnabled(
 		return new DataResponse();
 	}
 
+	/**
+	 * Change the email of admin of a group
+	 *
+	 * @param string $userId User ID of account that is admin of a group
+	 * @param string $email New email
+	 * @return DataResponse<Http::STATUS_OK|Http::STATUS_NOT_FOUND, list<empty>, array{}>
+	 *
+	 * 200: OK
+	 * 401: Unauthorized
+	 * 404: Group or email not found
+	 */
+	#[ApiRoute(verb: 'POST', url: '/api/{apiVersion}/change-admin-email', requirements: ['apiVersion' => '(v1)'])]
+	#[AuthorizedAdminSetting(settings:Users::class)]
+	#[NoCSRFRequired]
+	#[RestrictIp]
+	public function changeAdminEmail(
+		string $userId,
+		string $email,
+	): DataResponse {
+		$group = $this->groupManager->get($userId);
+		if (!$group instanceof IGroup) {
+			return new DataResponse([], Http::STATUS_NOT_FOUND);
+		}
+		$user = $this->userManager->get($userId);
+		if (!$user instanceof IUser) {
+			return new DataResponse([], Http::STATUS_NOT_FOUND);
+		}
+		$user->setSystemEMailAddress($email);
+		return new DataResponse();
+	}
+
 	/**
 	 * Make a user a subadmin of a group
 	 *
diff --git a/openapi.json b/openapi.json
index 7dbb12b..d5e52ed 100644
--- a/openapi.json
+++ b/openapi.json
@@ -287,6 +287,130 @@
                     }
                 }
             }
+        },
+        "/ocs/v2.php/apps/admin_group_manager/api/{apiVersion}/change-admin-email": {
+            "post": {
+                "operationId": "admin_group-change-admin-email",
+                "summary": "Change the email of admin of a group",
+                "description": "This endpoint requires admin access",
+                "tags": [
+                    "admin_group"
+                ],
+                "security": [
+                    {
+                        "bearer_auth": []
+                    },
+                    {
+                        "basic_auth": []
+                    }
+                ],
+                "requestBody": {
+                    "required": true,
+                    "content": {
+                        "application/json": {
+                            "schema": {
+                                "type": "object",
+                                "required": [
+                                    "userId",
+                                    "email"
+                                ],
+                                "properties": {
+                                    "userId": {
+                                        "type": "string",
+                                        "description": "User ID of account that is admin of a group"
+                                    },
+                                    "email": {
+                                        "type": "string",
+                                        "description": "New email"
+                                    }
+                                }
+                            }
+                        }
+                    }
+                },
+                "parameters": [
+                    {
+                        "name": "apiVersion",
+                        "in": "path",
+                        "required": true,
+                        "schema": {
+                            "type": "string",
+                            "enum": [
+                                "v1"
+                            ],
+                            "default": "v1"
+                        }
+                    },
+                    {
+                        "name": "OCS-APIRequest",
+                        "in": "header",
+                        "description": "Required to be true for the API request to pass",
+                        "required": true,
+                        "schema": {
+                            "type": "boolean",
+                            "default": true
+                        }
+                    }
+                ],
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "content": {
+                            "application/json": {
+                                "schema": {
+                                    "type": "object",
+                                    "required": [
+                                        "ocs"
+                                    ],
+                                    "properties": {
+                                        "ocs": {
+                                            "type": "object",
+                                            "required": [
+                                                "meta",
+                                                "data"
+                                            ],
+                                            "properties": {
+                                                "meta": {
+                                                    "$ref": "#/components/schemas/OCSMeta"
+                                                },
+                                                "data": {}
+                                            }
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    },
+                    "404": {
+                        "description": "Group or email not found",
+                        "content": {
+                            "application/json": {
+                                "schema": {
+                                    "type": "object",
+                                    "required": [
+                                        "ocs"
+                                    ],
+                                    "properties": {
+                                        "ocs": {
+                                            "type": "object",
+                                            "required": [
+                                                "meta",
+                                                "data"
+                                            ],
+                                            "properties": {
+                                                "meta": {
+                                                    "$ref": "#/components/schemas/OCSMeta"
+                                                },
+                                                "data": {}
+                                            }
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
         }
     },
     "tags": []
diff --git a/src/types/openapi/openapi.ts b/src/types/openapi/openapi.ts
index 45f99f0..ae6391c 100644
--- a/src/types/openapi/openapi.ts
+++ b/src/types/openapi/openapi.ts
@@ -46,6 +46,26 @@ export type paths = {
         patch?: never;
         trace?: never;
     };
+    "/ocs/v2.php/apps/admin_group_manager/api/{apiVersion}/change-admin-email": {
+        parameters: {
+            query?: never;
+            header?: never;
+            path?: never;
+            cookie?: never;
+        };
+        get?: never;
+        put?: never;
+        /**
+         * Change the email of admin of a group
+         * @description This endpoint requires admin access
+         */
+        post: operations["admin_group-change-admin-email"];
+        delete?: never;
+        options?: never;
+        head?: never;
+        patch?: never;
+        trace?: never;
+    };
 };
 export type webhooks = Record<string, never>;
 export type components = {
@@ -179,4 +199,57 @@ export interface operations {
             };
         };
     };
+    "admin_group-change-admin-email": {
+        parameters: {
+            query?: never;
+            header: {
+                /** @description Required to be true for the API request to pass */
+                "OCS-APIRequest": boolean;
+            };
+            path: {
+                apiVersion: "v1";
+            };
+            cookie?: never;
+        };
+        requestBody: {
+            content: {
+                "application/json": {
+                    /** @description User ID of account that is admin of a group */
+                    userId: string;
+                    /** @description New email */
+                    email: string;
+                };
+            };
+        };
+        responses: {
+            /** @description OK */
+            200: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": {
+                        ocs: {
+                            meta: components["schemas"]["OCSMeta"];
+                            data: unknown;
+                        };
+                    };
+                };
+            };
+            /** @description Group or email not found */
+            404: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": {
+                        ocs: {
+                            meta: components["schemas"]["OCSMeta"];
+                            data: unknown;
+                        };
+                    };
+                };
+            };
+        };
+    };
 }