diff --git a/apify-api/openapi/components/responses/Forbidden.yaml b/apify-api/openapi/components/responses/Forbidden.yaml
new file mode 100644
index 0000000000..4da651b06e
--- /dev/null
+++ b/apify-api/openapi/components/responses/Forbidden.yaml
@@ -0,0 +1,9 @@
+description: Forbidden - insufficient permissions to perform this action.
+content:
+  application/json:
+    schema:
+      $ref: ../schemas/common/ErrorResponse.yaml
+    example:
+      error:
+        type: permission-denied
+        message: You do not have permission to perform this action.
diff --git a/apify-api/openapi/paths/actor-builds/actor-builds.yaml b/apify-api/openapi/paths/actor-builds/actor-builds.yaml
index aed7fb5b8f..31a2ab5ef3 100644
--- a/apify-api/openapi/paths/actor-builds/actor-builds.yaml
+++ b/apify-api/openapi/paths/actor-builds/actor-builds.yaml
@@ -61,4 +61,6 @@ get:
             $ref: ../../components/schemas/actor-builds/ListOfBuildsResponse.yaml
     "400":
       $ref: ../../components/responses/BadRequest.yaml
+    "403":
+      $ref: ../../components/responses/Forbidden.yaml
   deprecated: false
diff --git a/apify-api/openapi/paths/actor-builds/actor-builds@{buildId}.yaml b/apify-api/openapi/paths/actor-builds/actor-builds@{buildId}.yaml
index e2b645577a..7a11dee179 100644
--- a/apify-api/openapi/paths/actor-builds/actor-builds@{buildId}.yaml
+++ b/apify-api/openapi/paths/actor-builds/actor-builds@{buildId}.yaml
@@ -48,6 +48,12 @@ get:
               - $ref: ../../components/schemas/actor-builds/BuildResponse.yaml
     "400":
       $ref: ../../components/responses/BadRequest.yaml
+    "401":
+      $ref: ../../components/responses/Unauthorized.yaml
+    "403":
+      $ref: ../../components/responses/Forbidden.yaml
+    "404":
+      $ref: ../../components/responses/NotFound.yaml
   deprecated: false
   x-legacy-doc-urls:
     - https://docs.apify.com/api/v2#/reference/actor-builds/build-object/get-build
@@ -86,6 +92,10 @@ delete:
       content: {}
     "400":
       $ref: ../../components/responses/BadRequest.yaml
+    "401":
+      $ref: ../../components/responses/Unauthorized.yaml
+    "404":
+      $ref: ../../components/responses/NotFound.yaml
   deprecated: false
   x-legacy-doc-urls:
     - https://docs.apify.com/api/v2#/reference/actor-builds/delete-build/delete-build
diff --git a/apify-api/openapi/paths/actor-builds/actor-builds@{buildId}@abort.yaml b/apify-api/openapi/paths/actor-builds/actor-builds@{buildId}@abort.yaml
index 911d1c8a9b..1f15312003 100644
--- a/apify-api/openapi/paths/actor-builds/actor-builds@{buildId}@abort.yaml
+++ b/apify-api/openapi/paths/actor-builds/actor-builds@{buildId}@abort.yaml
@@ -29,6 +29,10 @@ post:
               - $ref: ../../components/schemas/actor-builds/BuildResponse.yaml
     "400":
       $ref: ../../components/responses/BadRequest.yaml
+    "401":
+      $ref: ../../components/responses/Unauthorized.yaml
+    "403":
+      $ref: ../../components/responses/Forbidden.yaml
   deprecated: false
   x-legacy-doc-urls:
     - https://docs.apify.com/api/v2#/reference/actor-builds/abort-build/abort-build
diff --git a/apify-api/openapi/paths/actor-builds/actor-builds@{buildId}@log.yaml b/apify-api/openapi/paths/actor-builds/actor-builds@{buildId}@log.yaml
index 9b82111e7c..b4dd54442a 100644
--- a/apify-api/openapi/paths/actor-builds/actor-builds@{buildId}@log.yaml
+++ b/apify-api/openapi/paths/actor-builds/actor-builds@{buildId}@log.yaml
@@ -19,7 +19,7 @@ get:
       description: |
         If `true` or `1` then the logs will be streamed as long as the run or
         build is running.
-      required: true
+      required: false
       style: form
       explode: true
       schema:
@@ -30,7 +30,7 @@ get:
       description: |
         If `true` or `1` then the web browser will download the log file rather
         than open it in a tab.
-      required: true
+      required: false
       style: form
       explode: true
       schema:
@@ -54,6 +54,8 @@ get:
             2017-07-14T06:00:49.752Z Some useful debug information follows.
     "400":
       $ref: ../../components/responses/BadRequest.yaml
+    "404":
+      $ref: ../../components/responses/NotFound.yaml
   deprecated: false
   x-legacy-doc-urls:
     - https://docs.apify.com/api/v2#/reference/actor-builds/build-log/get-log
diff --git a/apify-api/openapi/paths/actor-builds/actor-builds@{buildId}@openapi.json.yaml b/apify-api/openapi/paths/actor-builds/actor-builds@{buildId}@openapi.json.yaml
index e0be98aae6..71e2102fc3 100644
--- a/apify-api/openapi/paths/actor-builds/actor-builds@{buildId}@openapi.json.yaml
+++ b/apify-api/openapi/paths/actor-builds/actor-builds@{buildId}@openapi.json.yaml
@@ -38,6 +38,8 @@ get:
             description: A standard OpenAPI 3.x JSON document.
     "400":
       $ref: ../../components/responses/BadRequest.yaml
+    "404":
+      $ref: ../../components/responses/NotFound.yaml
   x-js-parent: BuildClient
   x-js-name: getOpenApiDefinition
   x-js-doc-url: https://docs.apify.com/api/client/js/reference/class/BuildClient#getOpenApiDefinition