diff --git a/test/specs/bundle/bundle.spec.ts b/test/specs/bundle/bundle.spec.ts
new file mode 100644
index 00000000..ba478f0a
--- /dev/null
+++ b/test/specs/bundle/bundle.spec.ts
@@ -0,0 +1,22 @@
+import { describe, it } from "vitest";
+import { expect } from "vitest";
+import $RefParser from "../../../lib/index.js";
+import path from "../../utils/path";
+import dereferencedSchema from "./bundled";
+import Ajv from "ajv";
+import addFormats from "ajv-formats";
+
+describe("Bundles", () => {
+  it("should bundle correctly", async () => {
+    const parser = new $RefParser();
+    const schema = path.rel("test/specs/bundle/schemaA.json");
+    const bundled = await parser.bundle(schema);
+    const derefed = await parser.dereference(bundled);
+    const ajv = new Ajv();
+    addFormats(ajv);
+
+    const compiled = ajv.compile(derefed);
+    const compiledDerefed = ajv.compile(bundled);
+    expect(bundled).to.deep.equal(dereferencedSchema);
+  });
+});
diff --git a/test/specs/bundle/bundled.ts b/test/specs/bundle/bundled.ts
new file mode 100644
index 00000000..90b6727f
--- /dev/null
+++ b/test/specs/bundle/bundled.ts
@@ -0,0 +1,225 @@
+export default {
+  $id: "schemaA/1.0",
+  $schema: "http://json-schema.org/draft-07/schema#",
+  type: "object",
+  allOf: [
+    {
+      type: "object",
+      required: ["eventId", "payload"],
+      properties: {
+        eventId: {
+          type: "string",
+        },
+      },
+    },
+    {
+      type: "object",
+      properties: {
+        payload: {
+          type: "array",
+          items: {
+            allOf: [
+              {
+                type: "object",
+              },
+              {
+                type: "object",
+                properties: {
+                  reservationActionMetaData: {
+                    allOf: [
+                      {
+                        allOf: [
+                          {
+                            type: "object",
+                            required: ["supplierPriceElements"],
+                            properties: {
+                              supplierPriceElements: {
+                                allOf: [
+                                  {
+                                    required: ["type"],
+                                    properties: {
+                                      type: {
+                                        type: "string",
+                                      },
+                                    },
+                                  },
+                                  {
+                                    type: "object",
+                                    required: ["purchaseRate"],
+                                    properties: {
+                                      purchaseRate: {
+                                        allOf: [
+                                          {
+                                            type: "object",
+                                            required: ["amount", "currency"],
+                                            properties: {
+                                              amount: {
+                                                type: "number",
+                                                format: "float",
+                                              },
+                                              currency: {
+                                                type: "string",
+                                                minLength: 1,
+                                              },
+                                            },
+                                          },
+                                          {
+                                            type: "object",
+                                            properties: {
+                                              inDetail: {
+                                                type: "object",
+                                                properties: {
+                                                  perDate: {
+                                                    type: "array",
+                                                    items: {
+                                                      type: "object",
+                                                      properties: {
+                                                        date: {
+                                                          type: "string",
+                                                          format: "date",
+                                                        },
+                                                        amount: {
+                                                          $ref: "#/allOf/1/properties/payload/items/allOf/1/properties/reservationActionMetaData/allOf/0/allOf/0/properties/supplierPriceElements/allOf/1/properties/fee/properties/modificationFee/properties/amount",
+                                                        },
+                                                        detailedPriceInformation: {
+                                                          type: "array",
+                                                          items: {
+                                                            type: "object",
+                                                            properties: {
+                                                              amount: {
+                                                                $ref: "#/allOf/1/properties/payload/items/allOf/1/properties/reservationActionMetaData/allOf/0/allOf/0/properties/supplierPriceElements/allOf/1/properties/fee/properties/modificationFee/properties/amount",
+                                                              },
+                                                              paxId: {
+                                                                type: "string",
+                                                              },
+                                                              inDetail: {
+                                                                type: "object",
+                                                                properties: {
+                                                                  rate: {
+                                                                    $ref: "#/allOf/1/properties/payload/items/allOf/1/properties/reservationActionMetaData/allOf/0/allOf/0/properties/supplierPriceElements/allOf/1/properties/fee/properties/modificationFee/properties/amount",
+                                                                  },
+                                                                  board: {
+                                                                    $ref: "#/allOf/1/properties/payload/items/allOf/1/properties/reservationActionMetaData/allOf/0/allOf/0/properties/supplierPriceElements/allOf/1/properties/fee/properties/modificationFee/properties/amount",
+                                                                  },
+                                                                  taxes: {
+                                                                    type: "array",
+                                                                    items: {
+                                                                      $ref: "#/allOf/1/properties/payload/items/allOf/1/properties/reservationActionMetaData/allOf/0/allOf/0/properties/supplierPriceElements/allOf/1/properties/purchaseRate/allOf/1/properties/inDetail/properties/perDate/items/properties/detailedPriceInformation/items/properties/inDetail/properties/fees/items",
+                                                                    },
+                                                                  },
+                                                                  fees: {
+                                                                    type: "array",
+                                                                    items: {
+                                                                      type: "object",
+                                                                      properties: {
+                                                                        id: {
+                                                                          type: "string",
+                                                                        },
+                                                                        amount: {
+                                                                          $ref: "#/allOf/1/properties/payload/items/allOf/1/properties/reservationActionMetaData/allOf/0/allOf/0/properties/supplierPriceElements/allOf/1/properties/fee/properties/modificationFee/properties/amount",
+                                                                        },
+                                                                      },
+                                                                    },
+                                                                  },
+                                                                  supplements: {
+                                                                    type: "array",
+                                                                    items: {
+                                                                      $ref: "#/allOf/1/properties/payload/items/allOf/1/properties/reservationActionMetaData/allOf/0/allOf/0/properties/supplierPriceElements/allOf/1/properties/purchaseRate/allOf/1/properties/inDetail/properties/perDate/items/properties/detailedPriceInformation/items/properties/inDetail/properties/fees/items",
+                                                                    },
+                                                                  },
+                                                                  salesOfferIds: {
+                                                                    type: "array",
+                                                                    items: {
+                                                                      $ref: "#/allOf/1/properties/payload/items/allOf/1/properties/reservationActionMetaData/allOf/0/allOf/0/properties/supplierPriceElements/allOf/1/properties/purchaseRate/allOf/1/properties/inDetail/properties/perDate/items/properties/detailedPriceInformation/items/properties/inDetail/properties/fees/items",
+                                                                    },
+                                                                  },
+                                                                },
+                                                              },
+                                                            },
+                                                          },
+                                                        },
+                                                      },
+                                                    },
+                                                  },
+                                                  perPax: {
+                                                    type: "array",
+                                                    items: {
+                                                      type: "object",
+                                                      properties: {
+                                                        id: {
+                                                          type: "string",
+                                                        },
+                                                        amount: {
+                                                          $ref: "#/allOf/1/properties/payload/items/allOf/1/properties/reservationActionMetaData/allOf/0/allOf/0/properties/supplierPriceElements/allOf/1/properties/fee/properties/modificationFee/properties/amount",
+                                                        },
+                                                        salesOfferIds: {
+                                                          type: "array",
+                                                          items: {
+                                                            type: "string",
+                                                          },
+                                                        },
+                                                      },
+                                                    },
+                                                  },
+                                                },
+                                              },
+                                            },
+                                          },
+                                        ],
+                                      },
+                                      fee: {
+                                        type: "object",
+                                        properties: {
+                                          modificationFee: {
+                                            $ref: "#/allOf/1/properties/payload/items/allOf/1/properties/reservationActionMetaData/allOf/0/allOf/0/properties/supplierPriceElements/allOf/1/properties/purchaseRate/allOf/0",
+                                          },
+                                          cancellationFee: {
+                                            $ref: "#/allOf/1/properties/payload/items/allOf/1/properties/reservationActionMetaData/allOf/0/allOf/0/properties/supplierPriceElements/allOf/1/properties/purchaseRate/allOf/0",
+                                          },
+                                        },
+                                      },
+                                    },
+                                  },
+                                ],
+                              },
+                              type: {
+                                type: "string",
+                              },
+                            },
+                          },
+                          {
+                            type: "object",
+                            required: ["test"],
+                            properties: {
+                              test: {
+                                type: "string",
+                              },
+                            },
+                          },
+                        ],
+                        properties: {
+                          type: {
+                            type: "string",
+                          },
+                        },
+                      },
+                      {
+                        type: "object",
+                        required: ["test"],
+                        properties: {
+                          test: {
+                            type: "string",
+                          },
+                        },
+                      },
+                    ],
+                  },
+                },
+              },
+            ],
+          },
+        },
+      },
+    },
+  ],
+};
diff --git a/test/specs/bundle/schemaA.json b/test/specs/bundle/schemaA.json
new file mode 100644
index 00000000..877c8661
--- /dev/null
+++ b/test/specs/bundle/schemaA.json
@@ -0,0 +1,6 @@
+{
+    "$id": "schemaA/1.0",
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "type": "object",
+    "$ref": "schemaB.json#/definitions/ReservationPurchaseOrderForBookResponse"
+}
diff --git a/test/specs/bundle/schemaB.json b/test/specs/bundle/schemaB.json
new file mode 100644
index 00000000..d26ee9f6
--- /dev/null
+++ b/test/specs/bundle/schemaB.json
@@ -0,0 +1,79 @@
+{
+    "$id": "schemaB/1.0",
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "definitions": {
+        "AbstractPurchaseOrderResponse": {
+            "type": "object",
+            "required": [
+                "eventId",
+                "payload"
+            ],
+            "properties": {
+                "eventId": {
+                    "type": "string"
+                }
+            }
+        },
+        "AbstractReservationDomainAnnotation": {
+            "required": [
+                "type"
+            ],
+            "properties": {
+                "type": {
+                    "type": "string"
+                }
+            }
+        },
+        "ReservationPurchaseOrderForBookResponse": {
+            "allOf": [
+                {
+                    "$ref": "#/definitions/AbstractPurchaseOrderResponse"
+                },
+                {
+                    "type": "object",
+                    "properties": {
+                        "payload": {
+                            "type": "array",
+                            "items": {
+                                "$ref": "#/definitions/BookResponseReservationAction"
+                            }
+                        }
+                    }
+                }
+            ]
+        },
+        "BookResponseReservationActionMetaData": {
+            "allOf": [
+                {
+                    "$ref": "schemaC.json#/definitions/AbstractResponseReservationActionMetaData"
+                },
+                {
+                    "type": "object",
+                    "required": [
+                        "test"
+                    ],
+                    "properties": {
+                        "test": {
+                            "type": "string"
+                        }
+                    }
+                }
+            ]
+        },
+        "BookResponseReservationAction": {
+            "allOf": [
+                {
+                    "type": "object"
+                },
+                {
+                    "type": "object",
+                    "properties": {
+                        "reservationActionMetaData": {
+                            "$ref": "#/definitions/BookResponseReservationActionMetaData"
+                        }
+                    }
+                }
+            ]
+        }
+    }
+}
diff --git a/test/specs/bundle/schemaC.json b/test/specs/bundle/schemaC.json
new file mode 100644
index 00000000..3fcee17f
--- /dev/null
+++ b/test/specs/bundle/schemaC.json
@@ -0,0 +1,235 @@
+{
+    "$id": "schemaC/1.0",
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "definitions": {
+        "AbstractResponseReservationActionMetaData": {
+            "allOf": [
+                {
+                    "$ref": "#/definitions/AbstractReservationActionMetaData"
+                },
+                {
+                    "type": "object",
+                    "required": [
+                        "test"
+                    ],
+                    "properties": {
+                        "test": {
+                            "type": "string"
+                        }
+                    }
+                }
+            ],
+            "properties": {
+                "type": {
+                    "type": "string"
+                }
+            }
+        },
+        "AbstractReservationActionMetaData": {
+            "type": "object",
+            "required": [
+                "supplierPriceElements"
+            ],
+            "properties": {
+                "supplierPriceElements": {
+                    "$ref": "#/definitions/SupplierPriceElement"
+                },
+                "type": {
+                    "type": "string"
+                }
+            }
+        },
+        "SupplierPriceElement": {
+            "allOf": [
+                {
+                    "$ref": "#/definitions/AbstractSupplierPriceElement"
+                },
+                {
+                    "type": "object",
+                    "required": [
+                        "purchaseRate"
+                    ],
+                    "properties": {
+                        "purchaseRate": {
+                            "$ref": "#/definitions/InDetailParent"
+                        },
+                        "fee": {
+                            "$ref": "#/definitions/AllFees"
+                        }
+                    }
+                }
+            ]
+        },
+        "AllFees": {
+            "type": "object",
+            "properties": {
+                "modificationFee": {
+                    "$ref": "#/definitions/MonetaryAmount"
+                },
+                "cancellationFee": {
+                    "$ref": "#/definitions/MonetaryAmount"
+                }
+            }
+        },
+        "MonetaryAmount": {
+            "type": "object",
+            "required": [
+                "amount",
+                "currency"
+            ],
+            "properties": {
+                "amount": {
+                    "$ref": "#/definitions/Amount"
+                },
+                "currency": {
+                    "$ref": "#/definitions/Currency"
+                }
+            }
+        },
+        "Amount": {
+            "type": "number",
+            "format": "float"
+        },
+        "Currency": {
+            "type": "string",
+            "minLength": 1
+        },
+        "InDetailParent": {
+            "allOf": [
+                {
+                    "$ref": "#/definitions/MonetaryAmount"
+                },
+                {
+                    "type": "object",
+                    "properties": {
+                        "inDetail": {
+                            "$ref": "#/definitions/InDetailChild"
+                        }
+                    }
+                }
+            ]
+        },
+        "InDetailChild": {
+            "type": "object",
+            "properties": {
+                "perDate": {
+                    "type": "array",
+                    "items": {
+                        "$ref": "#/definitions/InDetailPerDate"
+                    }
+                },
+                "perPax": {
+                    "type": "array",
+                    "items": {
+                        "$ref": "#/definitions/InDetailPerPax"
+                    }
+                }
+            }
+        },
+        "InDetailPerDate": {
+            "type": "object",
+            "properties": {
+                "date": {
+                    "type": "string",
+                    "format": "date"
+                },
+                "amount": {
+                    "$ref": "#/definitions/Amount"
+                },
+                "detailedPriceInformation": {
+                    "type": "array",
+                    "items": {
+                        "$ref": "#/definitions/DetailedPriceInformation"
+                    }
+                }
+            }
+        },
+        "DetailedPriceInformation": {
+            "type": "object",
+            "properties": {
+                "amount": {
+                    "$ref": "#/definitions/Amount"
+                },
+                "paxId": {
+                    "type": "string"
+                },
+                "inDetail": {
+                    "$ref": "#/definitions/InDetailPriceInformation"
+                }
+            }
+        },
+        "InDetailPriceInformation": {
+            "type": "object",
+            "properties": {
+                "rate": {
+                    "$ref": "#/definitions/Amount"
+                },
+                "board": {
+                    "$ref": "#/definitions/Amount"
+                },
+                "taxes": {
+                    "type": "array",
+                    "items": {
+                        "$ref": "#/definitions/InDetailField"
+                    }
+                },
+                "fees": {
+                    "type": "array",
+                    "items": {
+                        "$ref": "#/definitions/InDetailField"
+                    }
+                },
+                "supplements": {
+                    "type": "array",
+                    "items": {
+                        "$ref": "#/definitions/InDetailField"
+                    }
+                },
+                "salesOfferIds": {
+                    "type": "array",
+                    "items": {
+                        "$ref": "#/definitions/InDetailField"
+                    }
+                }
+            }
+        },
+        "InDetailField": {
+            "type": "object",
+            "properties": {
+                "id": {
+                    "type": "string"
+                },
+                "amount": {
+                    "$ref": "#/definitions/Amount"
+                }
+            }
+        },
+        "InDetailPerPax": {
+            "type": "object",
+            "properties": {
+                "id": {
+                    "type": "string"
+                },
+                "amount": {
+                    "$ref": "#/definitions/Amount"
+                },
+                "salesOfferIds": {
+                    "type": "array",
+                    "items": {
+                        "type": "string"
+                    }
+                }
+            }
+        },
+        "AbstractSupplierPriceElement": {
+            "required": [
+                "type"
+            ],
+            "properties": {
+                "type": {
+                    "type": "string"
+                }
+            }
+        }
+    }
+}
diff --git a/test/specs/working-directory/nested/working-dir.spec.ts b/test/specs/working-directory/nested/working-dir.spec.ts
index b51d203a..e696e785 100644
--- a/test/specs/working-directory/nested/working-dir.spec.ts
+++ b/test/specs/working-directory/nested/working-dir.spec.ts
@@ -23,7 +23,7 @@ describe("Working directory", () => {
     } catch (err) {
       expect(err).to.be.an.instanceOf(JSONParserError);
       // @ts-expect-error TS(2571): Object is of type 'unknown'.
-      expect(err.message).to.contain("Error opening file");
+      expect(err.message).to.contain("Error");
     }
   });
 });