diff --git a/objects/email/definition.json b/objects/email/definition.json
index 770850f..7551d0c 100644
--- a/objects/email/definition.json
+++ b/objects/email/definition.json
@@ -3,7 +3,7 @@
   "uuid": "a0c666e0-fc65-4be8-b48f-3423d788b552",
   "meta-category": "network",
   "description": "Email object describing an email with meta-information",
-  "version": 8,
+  "version": 10,
   "attributes": {
     "reply-to": {
       "description": "Email address the reply will be sent to",
@@ -146,6 +146,11 @@
       "categories": [
         "Payload delivery"
       ]
+    },
+    "eml": {
+      "description": "Full EML",
+      "misp-attribute": "attachment",
+      "ui-priority": 1
     }
   },
   "requiredOneOf": [
@@ -163,6 +168,8 @@
     "thread-index",
     "header",
     "x-mailer",
-    "return-path"
+    "return-path",
+    "email-body",
+    "eml"
   ]
 }
diff --git a/objects/timestamp/definition.json b/objects/timestamp/definition.json
new file mode 100644
index 0000000..c1a8da0
--- /dev/null
+++ b/objects/timestamp/definition.json
@@ -0,0 +1,45 @@
+{
+  "requiredOneOf": [
+    "first-seen",
+    "last-seen"
+  ],
+  "attributes": {
+    "text": {
+      "description": "Description of the time object.",
+      "ui-priority": 0,
+      "misp-attribute": "text",
+      "disable_correlation": true
+    },
+    "precision": {
+      "description": "Timestamp precision represents the precision given to first_seen and/or last_seen in this object.",
+      "ui-priority": 0,
+      "misp-attribute": "text",
+      "sane_default": [
+        "year",
+        "month",
+        "day",
+        "hour",
+        "minute",
+        "full"
+      ],
+      "disable_correlation": true
+    },
+    "first-seen": {
+      "description": "First time that the linked object or attribute has been seen.",
+      "ui-priority": 0,
+      "misp-attribute": "datetime",
+      "disable_correlation": true
+    },
+    "last-seen": {
+      "description": "First time that the linked object or attribute has been seen.",
+      "ui-priority": 0,
+      "misp-attribute": "datetime",
+      "disable_correlation": true
+    }
+  },
+  "version": 1,
+  "description": "A generic timestamp object to represent time including first time and last time seen. Relationship will then define the kind of time relationship.",
+  "meta-category": "misc",
+  "uuid": "c8c91e23-4221-4533-8bf7-64e12b05f265",
+  "name": "timestamp"
+}
diff --git a/objects/whois/definition.json b/objects/whois/definition.json
index 0c4d5b0..ed91c86 100644
--- a/objects/whois/definition.json
+++ b/objects/whois/definition.json
@@ -74,6 +74,7 @@
         "External analysis"
       ],
       "ui-priority": 0,
+      "multiple": true,
       "misp-attribute": "domain"
     },
     "comment": {
@@ -84,10 +85,11 @@
     "ip-address": {
       "description": "IP address of the whois entry",
       "ui-priority": 0,
+      "multiple": true,
       "misp-attribute": "ip-src"
     }
   },
-  "version": 9,
+  "version": 10,
   "description": "Whois records information for a domain name or an IP address.",
   "meta-category": "network",
   "uuid": "429faea1-34ff-47af-8a00-7c62d3be5a6a",
diff --git a/objects/yara/definition.json b/objects/yara/definition.json
index 4b4724d..370bfdb 100644
--- a/objects/yara/definition.json
+++ b/objects/yara/definition.json
@@ -20,9 +20,20 @@
       "description": "Version of the YARA rule depending where the yara rule is known to work as expected.",
       "ui-priority": 0,
       "misp-attribute": "text"
+    },
+    "context": {
+      "description": "Context where the YARA rule can be applied",
+      "sane_default": [
+        "all",
+        "disk",
+        "memory",
+        "network"
+      ],
+      "misp-attribute": "text",
+      "ui-priority": 0
     }
   },
-  "version": 2,
+  "version": 3,
   "description": "An object describing a YARA rule along with its version.",
   "meta-category": "misc",
   "uuid": "b5acf82e-ecca-4868-82fe-9dbdf4d808c3",