diff --git a/vocabulary/format-assertion/src/main/java/io/github/sebastiantoepfer/jsonschema/vocabulary/formatassertion/Formats.java b/vocabulary/format-assertion/src/main/java/io/github/sebastiantoepfer/jsonschema/vocabulary/formatassertion/Formats.java
index a1231ca..fe3982f 100644
--- a/vocabulary/format-assertion/src/main/java/io/github/sebastiantoepfer/jsonschema/vocabulary/formatassertion/Formats.java
+++ b/vocabulary/format-assertion/src/main/java/io/github/sebastiantoepfer/jsonschema/vocabulary/formatassertion/Formats.java
@@ -31,27 +31,18 @@
 
 final class Formats {
 
-    private static final Map<String, Map.Entry<Integer, String>> RFCS = Map.of(
-        "hostname",
-        Map.entry(1123, "hostname"),
-        "date-time",
-        Map.entry(3339, "date-time"),
-        "date",
-        Map.entry(3339, "full-date"),
-        "time",
-        Map.entry(3339, "full-time"),
-        "duration",
-        Map.entry(3339, "duration"),
-        "uri",
-        Map.entry(3986, "URI"),
-        "uri-reference",
-        Map.entry(3986, "URI-reference"),
-        "email",
-        Map.entry(5321, "mailbox"),
-        "ipv4",
-        Map.entry(2673, "dotted-quad"),
-        "ipv6",
-        Map.entry(4291, "IPv6address")
+    private static final Map<String, Map.Entry<Integer, String>> RFCS = Map.ofEntries(
+        Map.entry("hostname", Map.entry(1123, "hostname")),
+        Map.entry("date-time", Map.entry(3339, "date-time")),
+        Map.entry("date", Map.entry(3339, "full-date")),
+        Map.entry("time", Map.entry(3339, "full-time")),
+        Map.entry("duration", Map.entry(3339, "duration")),
+        Map.entry("uri", Map.entry(3986, "URI")),
+        Map.entry("uri-reference", Map.entry(3986, "URI-reference")),
+        Map.entry("email", Map.entry(5321, "mailbox")),
+        Map.entry("ipv4", Map.entry(2673, "dotted-quad")),
+        Map.entry("uuid", Map.entry(4122, "UUID")),
+        Map.entry("ipv6", Map.entry(4291, "IPv6address"))
     );
 
     Format findByName(final String name) {
diff --git a/vocabulary/format-assertion/src/main/java/io/github/sebastiantoepfer/jsonschema/vocabulary/formatassertion/rfc/Rfcs.java b/vocabulary/format-assertion/src/main/java/io/github/sebastiantoepfer/jsonschema/vocabulary/formatassertion/rfc/Rfcs.java
index 9fa0970..cce9c1e 100644
--- a/vocabulary/format-assertion/src/main/java/io/github/sebastiantoepfer/jsonschema/vocabulary/formatassertion/rfc/Rfcs.java
+++ b/vocabulary/format-assertion/src/main/java/io/github/sebastiantoepfer/jsonschema/vocabulary/formatassertion/rfc/Rfcs.java
@@ -193,6 +193,17 @@ public final class Rfcs {
                 )
             )
         ),
+        Map.entry(
+            4122,
+            Map.of(
+                "UUID",
+                new RegExRule(
+                    Pattern.compile(
+                        "^[0-9A-Fa-f]{8}\\-[0-9A-Fa-f]{4}\\-[0-9A-Fa-f]{4}\\-[0-9A-Fa-f]{4}\\-[0-9A-Fa-f]{12}$"
+                    )
+                )
+            )
+        ),
         Map.entry(
             4291,
             Map.of(
diff --git a/vocabulary/format-assertion/src/main/resources/rfc/rfc4122 b/vocabulary/format-assertion/src/main/resources/rfc/rfc4122
new file mode 100644
index 0000000..10053c4
--- /dev/null
+++ b/vocabulary/format-assertion/src/main/resources/rfc/rfc4122
@@ -0,0 +1,15 @@
+UUID                   = time-low "-" time-mid "-"
+                         time-high-and-version "-"
+                         clock-seq-and-reserved
+                         clock-seq-low "-" node
+time-low               = 4hexOctet
+time-mid               = 2hexOctet
+time-high-and-version  = 2hexOctet
+clock-seq-and-reserved = hexOctet
+clock-seq-low          = hexOctet
+node                   = 6hexOctet
+hexOctet               = hexDigit hexDigit
+hexDigit =
+      "0" / "1" / "2" / "3" / "4" / "5" / "6" / "7" / "8" / "9" /
+      "a" / "b" / "c" / "d" / "e" / "f" /
+      "A" / "B" / "C" / "D" / "E" / "F"
\ No newline at end of file
diff --git a/vocabulary/format-assertion/src/test/java/io/github/sebastiantoepfer/jsonschema/vocabulary/formatassertion/FormatsTest.java b/vocabulary/format-assertion/src/test/java/io/github/sebastiantoepfer/jsonschema/vocabulary/formatassertion/FormatsTest.java
index c2f9553..53396a0 100644
--- a/vocabulary/format-assertion/src/test/java/io/github/sebastiantoepfer/jsonschema/vocabulary/formatassertion/FormatsTest.java
+++ b/vocabulary/format-assertion/src/test/java/io/github/sebastiantoepfer/jsonschema/vocabulary/formatassertion/FormatsTest.java
@@ -115,4 +115,10 @@ void should_found_urireferenceformat() {
         assertThat(new Formats().findByName("uri-reference").applyTo("/json-schema"), is(true));
         assertThat(new Formats().findByName("uri-reference").applyTo("1://noUri"), is(false));
     }
+
+    @Test
+    void should_found_uuidformat() {
+        assertThat(new Formats().findByName("uuid").applyTo("b7128c5b-eafc-4b6b-9b35-1c9e3dbaabb1"), is(true));
+        assertThat(new Formats().findByName("uuid").applyTo("b7128c5b-eafc-4b6b-9b35"), is(false));
+    }
 }