diff --git a/ext/spec_0_3.json b/ext/spec_0_3.json
deleted file mode 100644
index 2c362698..00000000
--- a/ext/spec_0_3.json
+++ /dev/null
@@ -1,88 +0,0 @@
-{
-  "$ref": "#/definitions/event",
-  "definitions": {
-    "specversion": {
-      "type": "string",
-      "minLength": 1,
-      "const": "0.3"
-    },
-    "datacontenttype": {
-      "type": "string"
-    },
-    "data": {
-      "type": [
-        "object",
-        "string"
-      ]
-    },
-    "event": {
-      "properties": {
-        "specversion": {
-          "$ref": "#/definitions/specversion"
-        },
-        "datacontenttype": {
-          "$ref": "#/definitions/datacontenttype"
-        },
-        "data": {
-          "$ref": "#/definitions/data"
-        },
-        "id": {
-          "$ref": "#/definitions/id"
-        },
-        "time": {
-          "$ref": "#/definitions/time"
-        },
-        "schemaurl": {
-          "$ref": "#/definitions/schemaurl"
-        },
-        "subject": {
-          "$ref": "#/definitions/subject"
-        },
-        "type": {
-          "$ref": "#/definitions/type"
-        },
-        "extensions": {
-          "$ref": "#/definitions/extensions"
-        },
-        "source": {
-          "$ref": "#/definitions/source"
-        }
-      },
-      "required": [
-        "specversion",
-        "id",
-        "type",
-        "source"
-      ],
-      "type": "object"
-    },
-    "id": {
-      "type": "string",
-      "minLength": 1
-    },
-    "time": {
-      "format": "date-time",
-      "type": "string"
-    },
-    "schemaurl": {
-      "type": "string",
-      "format": "uri-reference"
-    },
-    "subject": {
-      "type": "string",
-      "minLength": 1
-    },
-    "type": {
-      "type": "string",
-      "minLength": 1
-    },
-    "extensions": {
-      "type": "object"
-    },
-    "source": {
-      "format": "uri-reference",
-      "type": "string"
-    }
-  },
-  "type": "object"
-}
diff --git a/ext/spec_1.json b/ext/spec_1.json
deleted file mode 100644
index 50e1a607..00000000
--- a/ext/spec_1.json
+++ /dev/null
@@ -1,80 +0,0 @@
-{
-  "$ref": "#/definitions/event",
-  "definitions": {
-    "specversion": {
-      "type": "string",
-      "minLength": 1,
-      "const": "1.0"
-    },
-    "datacontenttype": {
-      "type": "string"
-    },
-    "data": {
-      "type": ["object", "string"]
-    },
-    "data_base64": {
-      "type": "string"
-    },
-    "event": {
-      "properties": {
-        "specversion": {
-          "$ref": "#/definitions/specversion"
-        },
-        "datacontenttype": {
-          "$ref": "#/definitions/datacontenttype"
-        },
-        "data": {
-          "$ref": "#/definitions/data"
-        },
-        "data_base64": {
-          "$ref": "#/definitions/data_base64"
-        },
-        "id": {
-          "$ref": "#/definitions/id"
-        },
-        "time": {
-          "$ref": "#/definitions/time"
-        },
-        "dataschema": {
-          "$ref": "#/definitions/dataschema"
-        },
-        "subject": {
-          "$ref": "#/definitions/subject"
-        },
-        "type": {
-          "$ref": "#/definitions/type"
-        },
-        "source": {
-          "$ref": "#/definitions/source"
-        }
-      },
-      "required": ["specversion", "id", "type", "source"],
-      "type": "object"
-    },
-    "id": {
-      "type": "string",
-      "minLength": 1
-    },
-    "time": {
-      "format": "date-time",
-      "type": "string"
-    },
-    "dataschema": {
-      "type": "string",
-      "format": "uri"
-    },
-    "subject": {
-      "type": "string",
-      "minLength": 1
-    },
-    "type": {
-      "type": "string",
-      "minLength": 1
-    },
-    "source": {
-      "format": "uri-reference",
-      "type": "string"
-    }
-  },
-  "type": "object"
-}
diff --git a/lib/specs/spec_0_3.js b/lib/specs/spec_0_3.js
index 66752952..f07e0fb1 100644
--- a/lib/specs/spec_0_3.js
+++ b/lib/specs/spec_0_3.js
@@ -25,7 +25,92 @@ SUPPORTED_CONTENT_ENCODING.base64 = {
   check: (data) => isBase64(data)
 };
 
-const schema = require("../../ext/spec_0_3.json");
+const schema = {
+  $ref: "#/definitions/event",
+  definitions: {
+    specversion: {
+      const: "0.3"
+    },
+    datacontenttype: {
+      type: "string"
+    },
+    data: {
+      type: [
+        "object",
+        "string"
+      ]
+    },
+    event: {
+      properties: {
+        specversion: {
+          $ref: "#/definitions/specversion"
+        },
+        datacontenttype: {
+          $ref: "#/definitions/datacontenttype"
+        },
+        data: {
+          $ref: "#/definitions/data"
+        },
+        id: {
+          $ref: "#/definitions/id"
+        },
+        time: {
+          $ref: "#/definitions/time"
+        },
+        schemaurl: {
+          $ref: "#/definitions/schemaurl"
+        },
+        subject: {
+          $ref: "#/definitions/subject"
+        },
+        type: {
+          $ref: "#/definitions/type"
+        },
+        extensions: {
+          $ref: "#/definitions/extensions"
+        },
+        source: {
+          $ref: "#/definitions/source"
+        }
+      },
+      required: [
+        "specversion",
+        "id",
+        "type",
+        "source"
+      ],
+      type: "object"
+    },
+    id: {
+      type: "string",
+      minLength: 1
+    },
+    time: {
+      format: "date-time",
+      type: "string"
+    },
+    schemaurl: {
+      type: "string",
+      format: "uri-reference"
+    },
+    subject: {
+      type: "string",
+      minLength: 1
+    },
+    type: {
+      type: "string",
+      minLength: 1
+    },
+    extensions: {
+      type: "object"
+    },
+    source: {
+      format: "uri-reference",
+      type: "string"
+    }
+  },
+  type: "object"
+};
 
 const ajv = new Ajv({
   extendRefs: true
diff --git a/lib/specs/spec_1.js b/lib/specs/spec_1.js
index 89e13b49..6415d15e 100644
--- a/lib/specs/spec_1.js
+++ b/lib/specs/spec_1.js
@@ -27,7 +27,86 @@ const RESERVED_ATTRIBUTES = {
   data_base64: "data_base64"
 };
 
-const schema = require("../../ext/spec_1.json");
+const schema = {
+  $ref: "#/definitions/event",
+  definitions: {
+    specversion: {
+      type: "string",
+      minLength: 1,
+      const: "1.0"
+    },
+    datacontenttype: {
+      type: "string"
+    },
+    data: {
+      type: ["object", "string"]
+    },
+    data_base64: {
+      type: "string"
+    },
+    event: {
+      properties: {
+        specversion: {
+          $ref: "#/definitions/specversion"
+        },
+        datacontenttype: {
+          $ref: "#/definitions/datacontenttype"
+        },
+        data: {
+          $ref: "#/definitions/data"
+        },
+        data_base64: {
+          $ref: "#/definitions/data_base64"
+        },
+        id: {
+          $ref: "#/definitions/id"
+        },
+        time: {
+          $ref: "#/definitions/time"
+        },
+        dataschema: {
+          $ref: "#/definitions/dataschema"
+        },
+        subject: {
+          $ref: "#/definitions/subject"
+        },
+        type: {
+          $ref: "#/definitions/type"
+        },
+        source: {
+          $ref: "#/definitions/source"
+        }
+      },
+      required: ["specversion", "id", "type", "source"],
+      type: "object"
+    },
+    id: {
+      type: "string",
+      minLength: 1
+    },
+    time: {
+      format: "date-time",
+      type: "string"
+    },
+    dataschema: {
+      type: "string",
+      format: "uri"
+    },
+    subject: {
+      type: "string",
+      minLength: 1
+    },
+    type: {
+      type: "string",
+      minLength: 1
+    },
+    source: {
+      format: "uri-reference",
+      type: "string"
+    }
+  },
+  type: "object"
+};
 
 const ajv = new Ajv({
   extendRefs: true