diff --git a/buildscripts/semantic-convention/generate.sh b/buildscripts/semantic-convention/generate.sh
index 6aff7ebb0c..30a352895b 100755
--- a/buildscripts/semantic-convention/generate.sh
+++ b/buildscripts/semantic-convention/generate.sh
@@ -4,7 +4,7 @@ SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 ROOT_DIR="${SCRIPT_DIR}/../../"
 
 # freeze the spec & generator tools versions to make SemanticAttributes generation reproducible
-SPEC_VERSION=v1.2.0
+SPEC_VERSION=v1.3.0
 GENERATOR_VERSION=0.3.1
 
 cd ${SCRIPT_DIR}
diff --git a/sdk-extensions/resources/src/main/java/io/opentelemetry/sdk/extension/resources/OsResource.java b/sdk-extensions/resources/src/main/java/io/opentelemetry/sdk/extension/resources/OsResource.java
index fac2fef0b3..2693666cc9 100644
--- a/sdk-extensions/resources/src/main/java/io/opentelemetry/sdk/extension/resources/OsResource.java
+++ b/sdk-extensions/resources/src/main/java/io/opentelemetry/sdk/extension/resources/OsResource.java
@@ -82,7 +82,7 @@ public final class OsResource {
     } else if (os.startsWith("solaris")) {
       return ResourceAttributes.OsTypeValues.SOLARIS;
     } else if (os.startsWith("z/os")) {
-      return ResourceAttributes.OsTypeValues.ZOS;
+      return ResourceAttributes.OsTypeValues.Z_OS;
     }
     return null;
   }
diff --git a/sdk-extensions/resources/src/test/java/io/opentelemetry/sdk/extension/resources/OsResourceTest.java b/sdk-extensions/resources/src/test/java/io/opentelemetry/sdk/extension/resources/OsResourceTest.java
index aae2042516..48ab8501d1 100644
--- a/sdk-extensions/resources/src/test/java/io/opentelemetry/sdk/extension/resources/OsResourceTest.java
+++ b/sdk-extensions/resources/src/test/java/io/opentelemetry/sdk/extension/resources/OsResourceTest.java
@@ -22,7 +22,8 @@ class OsResourceTest {
   @SetSystemProperty(key = "os.name", value = "Linux 4.11")
   void linux() {
     Attributes attributes = OsResource.buildResource().getAttributes();
-    assertThat(attributes.get(ResourceAttributes.OS_TYPE)).isEqualTo("LINUX");
+    assertThat(attributes.get(ResourceAttributes.OS_TYPE))
+        .isEqualTo(ResourceAttributes.OsTypeValues.LINUX);
     assertThat(attributes.get(ResourceAttributes.OS_DESCRIPTION)).isNotEmpty();
   }
 
@@ -30,7 +31,8 @@ class OsResourceTest {
   @SetSystemProperty(key = "os.name", value = "MacOS X 11")
   void macos() {
     Attributes attributes = OsResource.buildResource().getAttributes();
-    assertThat(attributes.get(ResourceAttributes.OS_TYPE)).isEqualTo("DARWIN");
+    assertThat(attributes.get(ResourceAttributes.OS_TYPE))
+        .isEqualTo(ResourceAttributes.OsTypeValues.DARWIN);
     assertThat(attributes.get(ResourceAttributes.OS_DESCRIPTION)).isNotEmpty();
   }
 
@@ -38,7 +40,8 @@ class OsResourceTest {
   @SetSystemProperty(key = "os.name", value = "Windows 10")
   void windows() {
     Attributes attributes = OsResource.buildResource().getAttributes();
-    assertThat(attributes.get(ResourceAttributes.OS_TYPE)).isEqualTo("WINDOWS");
+    assertThat(attributes.get(ResourceAttributes.OS_TYPE))
+        .isEqualTo(ResourceAttributes.OsTypeValues.WINDOWS);
     assertThat(attributes.get(ResourceAttributes.OS_DESCRIPTION)).isNotEmpty();
   }
 
@@ -46,7 +49,8 @@ class OsResourceTest {
   @SetSystemProperty(key = "os.name", value = "FreeBSD 10")
   void freebsd() {
     Attributes attributes = OsResource.buildResource().getAttributes();
-    assertThat(attributes.get(ResourceAttributes.OS_TYPE)).isEqualTo("FREEBSD");
+    assertThat(attributes.get(ResourceAttributes.OS_TYPE))
+        .isEqualTo(ResourceAttributes.OsTypeValues.FREEBSD);
     assertThat(attributes.get(ResourceAttributes.OS_DESCRIPTION)).isNotEmpty();
   }
 
@@ -54,7 +58,8 @@ class OsResourceTest {
   @SetSystemProperty(key = "os.name", value = "NetBSD 10")
   void netbsd() {
     Attributes attributes = OsResource.buildResource().getAttributes();
-    assertThat(attributes.get(ResourceAttributes.OS_TYPE)).isEqualTo("NETBSD");
+    assertThat(attributes.get(ResourceAttributes.OS_TYPE))
+        .isEqualTo(ResourceAttributes.OsTypeValues.NETBSD);
     assertThat(attributes.get(ResourceAttributes.OS_DESCRIPTION)).isNotEmpty();
   }
 
@@ -62,7 +67,8 @@ class OsResourceTest {
   @SetSystemProperty(key = "os.name", value = "OpenBSD 10")
   void openbsd() {
     Attributes attributes = OsResource.buildResource().getAttributes();
-    assertThat(attributes.get(ResourceAttributes.OS_TYPE)).isEqualTo("OPENBSD");
+    assertThat(attributes.get(ResourceAttributes.OS_TYPE))
+        .isEqualTo(ResourceAttributes.OsTypeValues.OPENBSD);
     assertThat(attributes.get(ResourceAttributes.OS_DESCRIPTION)).isNotEmpty();
   }
 
@@ -70,7 +76,8 @@ class OsResourceTest {
   @SetSystemProperty(key = "os.name", value = "DragonFlyBSD 10")
   void dragonflybsd() {
     Attributes attributes = OsResource.buildResource().getAttributes();
-    assertThat(attributes.get(ResourceAttributes.OS_TYPE)).isEqualTo("DRAGONFLYBSD");
+    assertThat(attributes.get(ResourceAttributes.OS_TYPE))
+        .isEqualTo(ResourceAttributes.OsTypeValues.DRAGONFLYBSD);
     assertThat(attributes.get(ResourceAttributes.OS_DESCRIPTION)).isNotEmpty();
   }
 
@@ -78,7 +85,8 @@ class OsResourceTest {
   @SetSystemProperty(key = "os.name", value = "HP-UX 10")
   void hpux() {
     Attributes attributes = OsResource.buildResource().getAttributes();
-    assertThat(attributes.get(ResourceAttributes.OS_TYPE)).isEqualTo("HPUX");
+    assertThat(attributes.get(ResourceAttributes.OS_TYPE))
+        .isEqualTo(ResourceAttributes.OsTypeValues.HPUX);
     assertThat(attributes.get(ResourceAttributes.OS_DESCRIPTION)).isNotEmpty();
   }
 
@@ -86,7 +94,8 @@ class OsResourceTest {
   @SetSystemProperty(key = "os.name", value = "AIX 10")
   void aix() {
     Attributes attributes = OsResource.buildResource().getAttributes();
-    assertThat(attributes.get(ResourceAttributes.OS_TYPE)).isEqualTo("AIX");
+    assertThat(attributes.get(ResourceAttributes.OS_TYPE))
+        .isEqualTo(ResourceAttributes.OsTypeValues.AIX);
     assertThat(attributes.get(ResourceAttributes.OS_DESCRIPTION)).isNotEmpty();
   }
 
@@ -94,7 +103,8 @@ class OsResourceTest {
   @SetSystemProperty(key = "os.name", value = "Solaris 10")
   void solaris() {
     Attributes attributes = OsResource.buildResource().getAttributes();
-    assertThat(attributes.get(ResourceAttributes.OS_TYPE)).isEqualTo("SOLARIS");
+    assertThat(attributes.get(ResourceAttributes.OS_TYPE))
+        .isEqualTo(ResourceAttributes.OsTypeValues.SOLARIS);
     assertThat(attributes.get(ResourceAttributes.OS_DESCRIPTION)).isNotEmpty();
   }
 
@@ -102,7 +112,8 @@ class OsResourceTest {
   @SetSystemProperty(key = "os.name", value = "Z/OS 10")
   void zos() {
     Attributes attributes = OsResource.buildResource().getAttributes();
-    assertThat(attributes.get(ResourceAttributes.OS_TYPE)).isEqualTo("ZOS");
+    assertThat(attributes.get(ResourceAttributes.OS_TYPE))
+        .isEqualTo(ResourceAttributes.OsTypeValues.Z_OS);
     assertThat(attributes.get(ResourceAttributes.OS_DESCRIPTION)).isNotEmpty();
   }
 
diff --git a/semconv/src/main/java/io/opentelemetry/semconv/resource/attributes/ResourceAttributes.java b/semconv/src/main/java/io/opentelemetry/semconv/resource/attributes/ResourceAttributes.java
index 9361fc82be..f13378b5e6 100644
--- a/semconv/src/main/java/io/opentelemetry/semconv/resource/attributes/ResourceAttributes.java
+++ b/semconv/src/main/java/io/opentelemetry/semconv/resource/attributes/ResourceAttributes.java
@@ -416,27 +416,27 @@ public final class ResourceAttributes {
     /** AWS Lambda. */
     public static final String AWS_LAMBDA = "aws_lambda";
     /** AWS Elastic Beanstalk. */
-    public static final String AWS_ELASTICBEANSTALK = "aws_elastic_beanstalk";
+    public static final String AWS_ELASTIC_BEANSTALK = "aws_elastic_beanstalk";
     /** Azure Virtual Machines. */
     public static final String AZURE_VM = "azure_vm";
     /** Azure Container Instances. */
-    public static final String AZURE_CONTAINERINSTANCES = "azure_container_instances";
+    public static final String AZURE_CONTAINER_INSTANCES = "azure_container_instances";
     /** Azure Kubernetes Service. */
     public static final String AZURE_AKS = "azure_aks";
     /** Azure Functions. */
     public static final String AZURE_FUNCTIONS = "azure_functions";
     /** Azure App Service. */
-    public static final String AZURE_APPSERVICE = "azure_app_service";
+    public static final String AZURE_APP_SERVICE = "azure_app_service";
     /** Google Cloud Compute Engine (GCE). */
-    public static final String GCP_COMPUTEENGINE = "gcp_compute_engine";
+    public static final String GCP_COMPUTE_ENGINE = "gcp_compute_engine";
     /** Google Cloud Run. */
-    public static final String GCP_CLOUDRUN = "gcp_cloud_run";
+    public static final String GCP_CLOUD_RUN = "gcp_cloud_run";
     /** Google Cloud Kubernetes Engine (GKE). */
-    public static final String GCP_KUBERNETESENGINE = "gcp_kubernetes_engine";
+    public static final String GCP_KUBERNETES_ENGINE = "gcp_kubernetes_engine";
     /** Google Cloud Functions (GCF). */
-    public static final String GCP_CLOUDFUNCTIONS = "gcp_cloud_functions";
+    public static final String GCP_CLOUD_FUNCTIONS = "gcp_cloud_functions";
     /** Google Cloud App Engine (GAE). */
-    public static final String GCP_APPENGINE = "gcp_app_engine";
+    public static final String GCP_APP_ENGINE = "gcp_app_engine";
 
     private CloudPlatformValues() {}
   }
@@ -471,27 +471,27 @@ public final class ResourceAttributes {
 
   public static final class OsTypeValues {
     /** Microsoft Windows. */
-    public static final String WINDOWS = "WINDOWS";
+    public static final String WINDOWS = "windows";
     /** Linux. */
-    public static final String LINUX = "LINUX";
+    public static final String LINUX = "linux";
     /** Apple Darwin. */
-    public static final String DARWIN = "DARWIN";
+    public static final String DARWIN = "darwin";
     /** FreeBSD. */
-    public static final String FREEBSD = "FREEBSD";
+    public static final String FREEBSD = "freebsd";
     /** NetBSD. */
-    public static final String NETBSD = "NETBSD";
+    public static final String NETBSD = "netbsd";
     /** OpenBSD. */
-    public static final String OPENBSD = "OPENBSD";
+    public static final String OPENBSD = "openbsd";
     /** DragonFly BSD. */
-    public static final String DRAGONFLYBSD = "DRAGONFLYBSD";
+    public static final String DRAGONFLYBSD = "dragonflybsd";
     /** HP-UX (Hewlett Packard Unix). */
-    public static final String HPUX = "HPUX";
+    public static final String HPUX = "hpux";
     /** AIX (Advanced Interactive eXecutive). */
-    public static final String AIX = "AIX";
+    public static final String AIX = "aix";
     /** Oracle Solaris. */
-    public static final String SOLARIS = "SOLARIS";
+    public static final String SOLARIS = "solaris";
     /** IBM z/OS. */
-    public static final String ZOS = "ZOS";
+    public static final String Z_OS = "z_os";
 
     private OsTypeValues() {}
   }
diff --git a/semconv/src/main/java/io/opentelemetry/semconv/trace/attributes/SemanticAttributes.java b/semconv/src/main/java/io/opentelemetry/semconv/trace/attributes/SemanticAttributes.java
index 2244b2670e..c844ec3ee6 100644
--- a/semconv/src/main/java/io/opentelemetry/semconv/trace/attributes/SemanticAttributes.java
+++ b/semconv/src/main/java/io/opentelemetry/semconv/trace/attributes/SemanticAttributes.java
@@ -588,6 +588,10 @@ public final class SemanticAttributes {
    */
   public static final AttributeKey<String> MESSAGING_OPERATION = stringKey("messaging.operation");
 
+  /** RabbitMQ message routing key. */
+  public static final AttributeKey<String> MESSAGING_RABBITMQ_ROUTING_KEY =
+      stringKey("messaging.rabbitmq.routing_key");
+
   /**
    * Message keys in Kafka are used for grouping alike messages to ensure they&#39;re processed on
    * the same partition. They differ from `messaging.message_id` in that they&#39;re not unique. If
@@ -731,28 +735,28 @@ public final class SemanticAttributes {
   }
 
   public static final class DbCassandraConsistencyLevelValues {
-    /** ALL. */
-    public static final String ALL = "ALL";
-    /** EACH_QUORUM. */
-    public static final String EACH_QUORUM = "EACH_QUORUM";
-    /** QUORUM. */
-    public static final String QUORUM = "QUORUM";
-    /** LOCAL_QUORUM. */
-    public static final String LOCAL_QUORUM = "LOCAL_QUORUM";
-    /** ONE. */
-    public static final String ONE = "ONE";
-    /** TWO. */
-    public static final String TWO = "TWO";
-    /** THREE. */
-    public static final String THREE = "THREE";
-    /** LOCAL_ONE. */
-    public static final String LOCAL_ONE = "LOCAL_ONE";
-    /** ANY. */
-    public static final String ANY = "ANY";
-    /** SERIAL. */
-    public static final String SERIAL = "SERIAL";
-    /** LOCAL_SERIAL. */
-    public static final String LOCAL_SERIAL = "LOCAL_SERIAL";
+    /** all. */
+    public static final String ALL = "all";
+    /** each_quorum. */
+    public static final String EACH_QUORUM = "each_quorum";
+    /** quorum. */
+    public static final String QUORUM = "quorum";
+    /** local_quorum. */
+    public static final String LOCAL_QUORUM = "local_quorum";
+    /** one. */
+    public static final String ONE = "one";
+    /** two. */
+    public static final String TWO = "two";
+    /** three. */
+    public static final String THREE = "three";
+    /** local_one. */
+    public static final String LOCAL_ONE = "local_one";
+    /** any. */
+    public static final String ANY = "any";
+    /** serial. */
+    public static final String SERIAL = "serial";
+    /** local_serial. */
+    public static final String LOCAL_SERIAL = "local_serial";
 
     private DbCassandraConsistencyLevelValues() {}
   }
@@ -795,14 +799,14 @@ public final class SemanticAttributes {
   }
 
   public static final class NetTransportValues {
-    /** IP.TCP. */
-    public static final String IP_TCP = "IP.TCP";
-    /** IP.UDP. */
-    public static final String IP_UDP = "IP.UDP";
+    /** ip_tcp. */
+    public static final String IP_TCP = "ip_tcp";
+    /** ip_udp. */
+    public static final String IP_UDP = "ip_udp";
     /** Another IP-based protocol. */
-    public static final String IP = "IP";
+    public static final String IP = "ip";
     /** Unix Domain socket. See below. */
-    public static final String UNIX = "Unix";
+    public static final String UNIX = "unix";
     /** Named or anonymous pipe. See note below. */
     public static final String PIPE = "pipe";
     /** In-process communication. */