diff --git a/deptrac.baseline.yaml b/deptrac.baseline.yaml
index ebcd48726..cacb15fb7 100644
--- a/deptrac.baseline.yaml
+++ b/deptrac.baseline.yaml
@@ -1,2 +1,8 @@
 deptrac:
   skip_violations:
+    /src/Extension/Propagator/B3/_register.php:
+      - OpenTelemetry\SDK\Registry
+    /src/Extension/Propagator/CloudTrace/_register.php:
+      - OpenTelemetry\SDK\Registry
+    /src/Extension/Propagator/Jaeger/_register.php:
+      - OpenTelemetry\SDK\Registry
diff --git a/deptrac.yaml b/deptrac.yaml
index f7e21785d..8507328db 100644
--- a/deptrac.yaml
+++ b/deptrac.yaml
@@ -19,34 +19,32 @@ deptrac:
     layers:
       -   name: API
           collectors:
-              -   type: className
-                  regex: ^OpenTelemetry\\API\\*
+              -   type: directory
+                  value: src/API/.*
       -   name: SDK
           collectors:
-              -   type: className
-                  regex: ^OpenTelemetry\\SDK\\*
+              -   type: directory
+                  value: src/SDK/.*
       -   name: Context
           collectors:
-              -   type: className
-                  regex: ^OpenTelemetry\\Context\\*
+              -   type: directory
+                  value: src/Context/.*
       -   name: SemConv
           collectors:
-              -   type: className
-                  regex: ^OpenTelemetry\\SemConv\\*
+              -   type: directory
+                  value: src/SemConv/.*
       -   name: Contrib
           collectors:
-              -   type: className
-                  regex: ^OpenTelemetry\\Contrib\\*
+              -   type: directory
+                  value: src/Contrib/.*
       -   name: Extension
           collectors:
-            -   type: className
-                regex: ^OpenTelemetry\\Extension\\*
+              -   type: directory
+                  value: src/Extension/.*
       -   name: OtelProto
           collectors:
-              -   type: className
-                  regex: ^OpenTelemetry\\Proto\\*
-              -   type: className
-                  regex: ^GPBMetadata\\Opentelemetry\\*
+              -   type: directory
+                  value: proto/otel/.*
       -   name: GoogleProtobuf
           collectors:
               -   type: className
diff --git a/src/Extension/Propagator/B3/_register.php b/src/Extension/Propagator/B3/_register.php
index 7537e8fc4..72e30cee0 100644
--- a/src/Extension/Propagator/B3/_register.php
+++ b/src/Extension/Propagator/B3/_register.php
@@ -3,14 +3,17 @@
 declare(strict_types=1);
 
 use OpenTelemetry\Extension\Propagator\B3\B3Propagator;
-use OpenTelemetry\SDK\Common\Configuration\KnownValues;
 use OpenTelemetry\SDK\Registry;
 
+if (!class_exists(Registry::class)) {
+    return;
+}
+
 Registry::registerTextMapPropagator(
-    KnownValues::VALUE_B3,
+    'b3',
     B3Propagator::getB3SingleHeaderInstance()
 );
 Registry::registerTextMapPropagator(
-    KnownValues::VALUE_B3_MULTI,
+    'b3multi',
     B3Propagator::getB3MultiHeaderInstance()
 );
diff --git a/src/Extension/Propagator/CloudTrace/_register.php b/src/Extension/Propagator/CloudTrace/_register.php
index 0643f389c..5fcac7243 100644
--- a/src/Extension/Propagator/CloudTrace/_register.php
+++ b/src/Extension/Propagator/CloudTrace/_register.php
@@ -3,15 +3,18 @@
 declare(strict_types=1);
 
 use OpenTelemetry\Extension\Propagator\CloudTrace\CloudTracePropagator;
-use OpenTelemetry\SDK\Common\Configuration\KnownValues;
 use OpenTelemetry\SDK\Registry;
 
+if (!class_exists(Registry::class)) {
+    return;
+}
+
 Registry::registerTextMapPropagator(
-    KnownValues::VALUE_CLOUD_TRACE,
+    'cloudtrace',
     CloudTracePropagator::getInstance()
 );
 
 Registry::registerTextMapPropagator(
-    KnownValues::VALUE_CLOUD_TRACE_ONEWAY,
+    'cloudtrace-oneway',
     CloudTracePropagator::getOneWayInstance()
 );
diff --git a/src/Extension/Propagator/Jaeger/_register.php b/src/Extension/Propagator/Jaeger/_register.php
index edad7b5b1..f1b7eb2c6 100644
--- a/src/Extension/Propagator/Jaeger/_register.php
+++ b/src/Extension/Propagator/Jaeger/_register.php
@@ -4,15 +4,18 @@
 
 use OpenTelemetry\Extension\Propagator\Jaeger\JaegerBaggagePropagator;
 use OpenTelemetry\Extension\Propagator\Jaeger\JaegerPropagator;
-use OpenTelemetry\SDK\Common\Configuration\KnownValues;
 use OpenTelemetry\SDK\Registry;
 
+if (!class_exists(Registry::class)) {
+    return;
+}
+
 Registry::registerTextMapPropagator(
-    KnownValues::VALUE_JAEGER,
+    'jaeger',
     JaegerPropagator::getInstance()
 );
 
 Registry::registerTextMapPropagator(
-    KnownValues::VALUE_JAEGER_BAGGAGE,
+    'jaeger-baggage',
     JaegerBaggagePropagator::getInstance()
 );