diff --git a/Makefile b/Makefile
index 92baf0fc..5e333607 100644
--- a/Makefile
+++ b/Makefile
@@ -25,8 +25,8 @@ help:     ## Show this help.
 	 @egrep -h '\s##\s' $(MAKEFILE_LIST) | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m  %-30s\033[0m %s\n", $$1, $$2}'
 
 .PHONY: tests
-test: ## Run all document related checks found in tox: pytest, jsonformat, validate, jsonschema
-	tox run -e pytest,jsonformat,validate,jsonschema
+test: ## Run all document related checks found in tox: pytest, jsonformat, validate
+	tox run -e pytest,jsonformat,validate
 
 .PHONY: generate_docs
 generate_docs: ## Generate the Markdown files based on the YAML definitions
diff --git a/definitions/EiffelActivityCanceledEvent/1.0.0.yml b/definitions/EiffelActivityCanceledEvent/1.0.0.yml
index e007f8b1..3bc9fbbc 100644
--- a/definitions/EiffelActivityCanceledEvent/1.0.0.yml
+++ b/definitions/EiffelActivityCanceledEvent/1.0.0.yml
@@ -44,7 +44,7 @@ required:
   - meta
   - data
   - links
-additionalProperties: false
+additonalProperties: false
 _links:
   ACTIVITY_EXECUTION:
     description: Declares the activity execution that was canceled.
diff --git a/definitions/EiffelActivityCanceledEvent/1.1.0.yml b/definitions/EiffelActivityCanceledEvent/1.1.0.yml
index 4b04b45f..5e025367 100644
--- a/definitions/EiffelActivityCanceledEvent/1.1.0.yml
+++ b/definitions/EiffelActivityCanceledEvent/1.1.0.yml
@@ -44,7 +44,7 @@ required:
   - meta
   - data
   - links
-additionalProperties: false
+additonalProperties: false
 _links:
   ACTIVITY_EXECUTION:
     description: Declares the activity execution that was canceled.
diff --git a/definitions/EiffelActivityCanceledEvent/2.0.0.yml b/definitions/EiffelActivityCanceledEvent/2.0.0.yml
index a0caf5a6..a1b10ee3 100644
--- a/definitions/EiffelActivityCanceledEvent/2.0.0.yml
+++ b/definitions/EiffelActivityCanceledEvent/2.0.0.yml
@@ -44,7 +44,7 @@ required:
   - meta
   - data
   - links
-additionalProperties: false
+additonalProperties: false
 _links:
   ACTIVITY_EXECUTION:
     description: Declares the activity execution that was canceled.
diff --git a/definitions/EiffelActivityCanceledEvent/3.0.0.yml b/definitions/EiffelActivityCanceledEvent/3.0.0.yml
index 34f83791..1e0e9304 100644
--- a/definitions/EiffelActivityCanceledEvent/3.0.0.yml
+++ b/definitions/EiffelActivityCanceledEvent/3.0.0.yml
@@ -44,7 +44,7 @@ required:
   - meta
   - data
   - links
-additionalProperties: false
+additonalProperties: false
 _links:
   ACTIVITY_EXECUTION:
     description: Declares the activity execution that was canceled.
diff --git a/definitions/EiffelActivityCanceledEvent/3.1.0.yml b/definitions/EiffelActivityCanceledEvent/3.1.0.yml
index 33d81396..f6ab2bce 100644
--- a/definitions/EiffelActivityCanceledEvent/3.1.0.yml
+++ b/definitions/EiffelActivityCanceledEvent/3.1.0.yml
@@ -44,7 +44,7 @@ required:
   - meta
   - data
   - links
-additionalProperties: false
+additonalProperties: false
 _links:
   ACTIVITY_EXECUTION:
     description: Declares the activity execution that was canceled.
diff --git a/definitions/EiffelActivityCanceledEvent/3.2.0.yml b/definitions/EiffelActivityCanceledEvent/3.2.0.yml
index 1c73daeb..a94fd492 100644
--- a/definitions/EiffelActivityCanceledEvent/3.2.0.yml
+++ b/definitions/EiffelActivityCanceledEvent/3.2.0.yml
@@ -44,7 +44,7 @@ required:
   - meta
   - data
   - links
-additionalProperties: false
+additonalProperties: false
 _links:
   ACTIVITY_EXECUTION:
     description: Declares the activity execution that was canceled.
diff --git a/definitions/EiffelActivityCanceledEvent/4.0.0.yml b/definitions/EiffelActivityCanceledEvent/4.0.0.yml
new file mode 100644
index 00000000..3d64f086
--- /dev/null
+++ b/definitions/EiffelActivityCanceledEvent/4.0.0.yml
@@ -0,0 +1,121 @@
+# Copyright 2017-2024 Ericsson AB and others.
+# For a full list of individual contributors, please see the commit history.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+---
+$schema: http://json-schema.org/draft-04/schema#
+_abbrev: ActC
+_description: The EiffelActivityCanceledEvent signals that a previously
+  triggered activity execution has been canceled _before it has started_.
+  This is typically used in queuing situations where a queued execution
+  is dequeued. It is recommended that __CAUSE__ links be used to indicate
+  the reason.
+type: object
+properties:
+  meta:
+    $ref: ../EiffelMetaProperty/3.1.0.yml
+  data:
+    type: object
+    properties:
+      reason:
+        _description: Any human readable information as to the reason
+          for dequeueing.
+        type: string
+      customData:
+        type: array
+        items:
+          $ref: ../EiffelCustomDataProperty/1.0.0.yml
+    additionalProperties: false
+  links:
+    type: array
+    items:
+      $ref: ../EiffelEventLink/1.1.1.yml
+required:
+  - meta
+  - data
+  - links
+additionalProperties: false
+_links:
+  ACTIVITY_EXECUTION:
+    description: Declares the activity execution that was canceled.
+      In other words, [EiffelActivityTriggeredEvent](../eiffel-vocabulary/EiffelActivityTriggeredEvent.md)
+      acts as a handle for the activity execution. This differs from
+      __CONTEXT__. In __ACTIVITY_EXECUTION__ the source carries information
+      pertaining to the target (i.e. the activity started, finished
+      or was canceled). In __CONTEXT__, on the other hand, the source
+      constitutes a subset of the target (e.g. this test case was executed
+      as part of that activity or test suite).
+    required: true
+    multiple: false
+    targets:
+      any_type: false
+      types:
+        - EiffelActivityTriggeredEvent
+  CAUSE:
+    description: While for most events it is recommended that __CAUSE__
+      SHOULD not be used in conjunction with __CONTEXT__, EiffelActivityCanceledEvent
+      is a special case as it represents a deviation from previous
+      intention. Therefore it is recommended that __CAUSE__ always
+      be included where applicable.
+    required: false
+    multiple: true
+    targets:
+      any_type: true
+      types: []
+  CONTEXT:
+    description: Identifies the activity or test suite of which this
+      event constitutes a part.
+    required: false
+    multiple: false
+    targets:
+      any_type: false
+      types:
+        - EiffelActivityTriggeredEvent
+        - EiffelTestSuiteStartedEvent
+  FLOW_CONTEXT:
+    description: 'Identifies the flow context of the event: which is
+      the continuous integration and delivery flow in which this occurred
+      – e.g. which product, project, track or version this is applicable
+      to.'
+    required: false
+    multiple: true
+    targets:
+      any_type: false
+      types:
+        - EiffelFlowContextDefinedEvent
+_history:
+  - version: 4.0.0
+    changes: Fix bug in schema regarding additionalProperties (see [Issue 376](https://github.com/eiffel-community/eiffel/issues/376)).
+  - version: 3.2.0
+    introduced_in: edition-arica
+    changes: Add schema URL to the meta object (see [Issue 280](https://github.com/eiffel-community/eiffel/issues/280)).
+  - version: 3.1.0
+    introduced_in: edition-lyon
+    changes: Add links.domainId member (see [Issue 233](https://github.com/eiffel-community/eiffel/issues/233)).
+  - version: 3.0.0
+    introduced_in: edition-agen
+    changes: Improved information integrity protection (see [Issue
+      185](https://github.com/eiffel-community/eiffel/issues/185)).
+  - version: 2.0.0
+    introduced_in: edition-agen
+    changes: Introduced purl identifiers instead of GAVs (see [Issue
+      182](https://github.com/eiffel-community/eiffel/issues/182))
+  - version: 1.1.0
+    introduced_in: edition-toulouse
+    changes: Multiple links of type FLOW_CONTEXT allowed.
+  - version: 1.0.0
+    introduced_in: edition-bordeaux
+    changes: Initial version.
+_examples:
+  - title: Simple example
+    url: ../examples/events/EiffelActivityCanceledEvent/simple.json
diff --git a/eiffel-vocabulary/EiffelActivityCanceledEvent.md b/eiffel-vocabulary/EiffelActivityCanceledEvent.md
index a6201112..fe4178a7 100644
--- a/eiffel-vocabulary/EiffelActivityCanceledEvent.md
+++ b/eiffel-vocabulary/EiffelActivityCanceledEvent.md
@@ -1,5 +1,5 @@
 <!---
-   This file was generated from ../definitions/EiffelActivityCanceledEvent/3.2.0.yml.
+   This file was generated from ../definitions/EiffelActivityCanceledEvent/4.0.0.yml.
    See that file for a copyright notice.
 --->
 
@@ -177,6 +177,7 @@ __Description:__ A URI pointing at a location from where the schema used when cr
 
 | Version | Introduced in | Changes |
 | ------- | ------------- | ------- |
+| 4.0.0 | Not yet released in an edition | Fix bug in schema regarding additionalProperties (see [Issue 376](https://github.com/eiffel-community/eiffel/issues/376)). |
 | 3.2.0 | [edition-arica](../../../tree/edition-arica) | Add schema URL to the meta object (see [Issue 280](https://github.com/eiffel-community/eiffel/issues/280)). |
 | 3.1.0 | [edition-lyon](../../../tree/edition-lyon) | Add links.domainId member (see [Issue 233](https://github.com/eiffel-community/eiffel/issues/233)). |
 | 3.0.0 | [edition-agen](../../../tree/edition-agen) | Improved information integrity protection (see [Issue 185](https://github.com/eiffel-community/eiffel/issues/185)). |
diff --git a/schemas/EiffelActivityCanceledEvent/1.0.0.json b/schemas/EiffelActivityCanceledEvent/1.0.0.json
index 81c7b761..b0419e70 100644
--- a/schemas/EiffelActivityCanceledEvent/1.0.0.json
+++ b/schemas/EiffelActivityCanceledEvent/1.0.0.json
@@ -152,5 +152,5 @@
     "data",
     "links"
   ],
-  "additionalProperties": false
+  "additonalProperties": false
 }
diff --git a/schemas/EiffelActivityCanceledEvent/1.1.0.json b/schemas/EiffelActivityCanceledEvent/1.1.0.json
index bc00332a..08e1d241 100644
--- a/schemas/EiffelActivityCanceledEvent/1.1.0.json
+++ b/schemas/EiffelActivityCanceledEvent/1.1.0.json
@@ -152,5 +152,5 @@
     "data",
     "links"
   ],
-  "additionalProperties": false
+  "additonalProperties": false
 }
diff --git a/schemas/EiffelActivityCanceledEvent/2.0.0.json b/schemas/EiffelActivityCanceledEvent/2.0.0.json
index 7f559237..7c8e2810 100644
--- a/schemas/EiffelActivityCanceledEvent/2.0.0.json
+++ b/schemas/EiffelActivityCanceledEvent/2.0.0.json
@@ -136,5 +136,5 @@
     "data",
     "links"
   ],
-  "additionalProperties": false
+  "additonalProperties": false
 }
diff --git a/schemas/EiffelActivityCanceledEvent/3.0.0.json b/schemas/EiffelActivityCanceledEvent/3.0.0.json
index 1911de6a..edf01ca0 100644
--- a/schemas/EiffelActivityCanceledEvent/3.0.0.json
+++ b/schemas/EiffelActivityCanceledEvent/3.0.0.json
@@ -178,5 +178,5 @@
     "data",
     "links"
   ],
-  "additionalProperties": false
+  "additonalProperties": false
 }
diff --git a/schemas/EiffelActivityCanceledEvent/3.1.0.json b/schemas/EiffelActivityCanceledEvent/3.1.0.json
index a6a4ddc1..6e8f25e8 100644
--- a/schemas/EiffelActivityCanceledEvent/3.1.0.json
+++ b/schemas/EiffelActivityCanceledEvent/3.1.0.json
@@ -181,5 +181,5 @@
     "data",
     "links"
   ],
-  "additionalProperties": false
+  "additonalProperties": false
 }
diff --git a/schemas/EiffelActivityCanceledEvent/3.2.0.json b/schemas/EiffelActivityCanceledEvent/3.2.0.json
index 7993f7e1..cb4655c2 100644
--- a/schemas/EiffelActivityCanceledEvent/3.2.0.json
+++ b/schemas/EiffelActivityCanceledEvent/3.2.0.json
@@ -184,5 +184,5 @@
     "data",
     "links"
   ],
-  "additionalProperties": false
+  "additonalProperties": false
 }
diff --git a/schemas/EiffelActivityCanceledEvent/4.0.0.json b/schemas/EiffelActivityCanceledEvent/4.0.0.json
new file mode 100644
index 00000000..fb8b08a9
--- /dev/null
+++ b/schemas/EiffelActivityCanceledEvent/4.0.0.json
@@ -0,0 +1,188 @@
+{
+  "$schema": "http://json-schema.org/draft-04/schema#",
+  "type": "object",
+  "properties": {
+    "meta": {
+      "type": "object",
+      "properties": {
+        "id": {
+          "type": "string",
+          "pattern": "^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$"
+        },
+        "type": {
+          "type": "string",
+          "enum": [
+            "EiffelActivityCanceledEvent"
+          ]
+        },
+        "version": {
+          "type": "string",
+          "enum": [
+            "4.0.0"
+          ],
+          "default": "4.0.0"
+        },
+        "time": {
+          "type": "integer"
+        },
+        "tags": {
+          "type": "array",
+          "items": {
+            "type": "string"
+          }
+        },
+        "source": {
+          "type": "object",
+          "properties": {
+            "domainId": {
+              "type": "string"
+            },
+            "host": {
+              "type": "string"
+            },
+            "name": {
+              "type": "string"
+            },
+            "serializer": {
+              "type": "string",
+              "pattern": "^pkg:"
+            },
+            "uri": {
+              "type": "string"
+            }
+          },
+          "additionalProperties": false
+        },
+        "security": {
+          "type": "object",
+          "properties": {
+            "authorIdentity": {
+              "type": "string"
+            },
+            "integrityProtection": {
+              "type": "object",
+              "properties": {
+                "signature": {
+                  "type": "string"
+                },
+                "alg": {
+                  "type": "string",
+                  "enum": [
+                    "HS256",
+                    "HS384",
+                    "HS512",
+                    "RS256",
+                    "RS384",
+                    "RS512",
+                    "ES256",
+                    "ES384",
+                    "ES512",
+                    "PS256",
+                    "PS384",
+                    "PS512"
+                  ]
+                },
+                "publicKey": {
+                  "type": "string"
+                }
+              },
+              "required": [
+                "signature",
+                "alg"
+              ],
+              "additionalProperties": false
+            },
+            "sequenceProtection": {
+              "type": "array",
+              "items": {
+                "type": "object",
+                "properties": {
+                  "sequenceName": {
+                    "type": "string"
+                  },
+                  "position": {
+                    "type": "integer"
+                  }
+                },
+                "additionalProperties": false,
+                "required": [
+                  "sequenceName",
+                  "position"
+                ]
+              }
+            }
+          },
+          "additionalProperties": false,
+          "required": [
+            "authorIdentity"
+          ]
+        },
+        "schemaUri": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "id",
+        "type",
+        "version",
+        "time"
+      ],
+      "additionalProperties": false
+    },
+    "data": {
+      "type": "object",
+      "properties": {
+        "reason": {
+          "type": "string"
+        },
+        "customData": {
+          "type": "array",
+          "items": {
+            "type": "object",
+            "properties": {
+              "key": {
+                "type": "string"
+              },
+              "value": {}
+            },
+            "required": [
+              "key",
+              "value"
+            ],
+            "additionalProperties": false
+          }
+        }
+      },
+      "additionalProperties": false
+    },
+    "links": {
+      "type": "array",
+      "items": {
+        "type": "object",
+        "properties": {
+          "type": {
+            "type": "string"
+          },
+          "target": {
+            "type": "string",
+            "pattern": "^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$"
+          },
+          "domainId": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "type",
+          "target"
+        ],
+        "additionalProperties": false
+      }
+    }
+  },
+  "required": [
+    "meta",
+    "data",
+    "links"
+  ],
+  "additionalProperties": false
+}
diff --git a/test_jsonschema.py b/test_jsonschema.py
deleted file mode 100644
index 8c4c6d27..00000000
--- a/test_jsonschema.py
+++ /dev/null
@@ -1,39 +0,0 @@
-# Copyright 2022-2023 Axis Communications AB and others.
-# For a full list of individual contributors, please see the commit history.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-import json
-import subprocess
-
-import jsonschema
-import pytest
-
-
-@pytest.mark.parametrize(
-    "filename",
-    subprocess.check_output(["git", "ls-files", "--exclude-standard", "schemas/*.json"])
-    .decode("utf-8")
-    .splitlines(),
-)
-def test_json_schema(filename):
-    with open(filename) as input_file:
-        event_schema = json.loads(input_file.read())
-
-    stricter_metaschema = dict(
-        jsonschema.Draft4Validator.META_SCHEMA, additionalProperties=False
-    )
-    StrictDraft4Validator = jsonschema.validators.create(
-        stricter_metaschema, jsonschema.Draft4Validator.VALIDATORS, "StrictDraft4"
-    )
-    StrictDraft4Validator.check_schema(event_schema)
diff --git a/tox.ini b/tox.ini
index b5c2fee6..c89a9d0d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -20,7 +20,6 @@ envlist =
     black
     isort
     jsonformat
-    jsonschema
     pytest
     markdownlint
 
@@ -50,12 +49,6 @@ deps =
     pytest==6.2.5
 commands = pytest test_jsonformat.py {posargs}
 
-[testenv:jsonschema]
-deps =
-    pytest==6.2.5
-    jsonschema==4.20.0
-commands = pytest test_jsonschema.py {posargs}
-
 [testenv:pytest]
 deps =
     -rrequirements.txt