diff --git a/.github/workflows/sonarcloud.yml b/.github/workflows/sonarcloud.yml
index c7b367340..02a328912 100644
--- a/.github/workflows/sonarcloud.yml
+++ b/.github/workflows/sonarcloud.yml
@@ -8,8 +8,24 @@ on:
       - feature/v2
   pull_request:
     types: [opened, synchronize, reopened]
+
+env:
+  SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
+
 jobs:
+  checksecret:
+    name: check if SONAR_TOKEN is set in github secrets
+    runs-on: ubuntu-latest
+    outputs:
+      is_SONAR_TOKEN_set: ${{ steps.checksecret_job.outputs.is_SONAR_TOKEN_set }}
+    steps:
+      - name: Check whether unity activation requests should be done
+        id: checksecret_job
+        run: |
+          echo "is_SONAR_TOKEN_set=${{ env.SONAR_TOKEN != '' }}" >> $GITHUB_OUTPUT
   build:
+    needs: [checksecret]
+    if: needs.checksecret.outputs.is_SONAR_TOKEN_set == 'true'
     name: Build
     runs-on: ubuntu-latest
     steps:
@@ -37,5 +53,4 @@ jobs:
       - name: Build and analyze
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}  # Needed to get PR information, if any
-          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
         run: ./gradlew build sonarqube --info
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 27061f84c..b040e5bcb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,33 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
+### Changed
+
+## [2.0.21] - 2023-11-08
+
+### Changed
+
+- Changed CoreHttpProvider dependency from OkHttpClient to Call.Factory (parent interface implemented by OkHttpClient). This make usage of OpenTelemetry tracing possible.
+  https://github.com/open-telemetry/opentelemetry-java-instrumentation/blob/main/instrumentation/okhttp/okhttp-3.0/library/README.md
+
+```java
+  private Call.Factory createTracedClient(OpenTelemetry openTelemetry, @Nonnull final IAuthenticationProvider auth) {
+    return OkHttpTelemetry.builder(openTelemetry).build().newCallFactory(createClient(auth));
+  }
+
+  private OkHttpClient createClient(@Nonnull final IAuthenticationProvider auth) {
+    return HttpClients.createDefault(auth);
+  }
+  
+  // then create the GraphServiceClient
+    IAuthenticationProvider authenticationProvider = ...;
+    GraphServiceClient
+    .builder(Call.Factory.class, Request.class)
+    .httpClient(createTracedClient(openTelemetry, authenticationProvider))
+    .authenticationProvider(authenticationProvider)
+    .buildClient();
+```
+
 ## [2.0.20] - 2023-10-23
 
 ### Changed 
diff --git a/gradle.properties b/gradle.properties
index c270067b9..11030eaf9 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -25,7 +25,7 @@ mavenGroupId         = com.microsoft.graph
 mavenArtifactId      = microsoft-graph-core
 mavenMajorVersion    = 2
 mavenMinorVersion    = 0
-mavenPatchVersion    = 20
+mavenPatchVersion    = 21
 mavenArtifactSuffix = 
 
 #These values are used to run functional tests
diff --git a/src/main/java/com/microsoft/graph/core/BaseClient.java b/src/main/java/com/microsoft/graph/core/BaseClient.java
index cbdbac4e7..27382a382 100644
--- a/src/main/java/com/microsoft/graph/core/BaseClient.java
+++ b/src/main/java/com/microsoft/graph/core/BaseClient.java
@@ -41,6 +41,7 @@
 import javax.annotation.Nonnull;
 
 import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
+import okhttp3.Call;
 import okhttp3.OkHttpClient;
 import okhttp3.Request;
 
@@ -185,7 +186,7 @@ private httpClientType getHttpClient() {
         @SuppressWarnings("unchecked")
         private IHttpProvider<nativeRequestType> getHttpProvider() {
             if(httpProvider == null) {
-                return (IHttpProvider<nativeRequestType>)new CoreHttpProvider(getSerializer(), getLogger(), (OkHttpClient)getHttpClient());
+                return (IHttpProvider<nativeRequestType>)new CoreHttpProvider(getSerializer(), getLogger(), (Call.Factory) getHttpClient());
             } else {
                 return httpProvider;
             }
diff --git a/src/main/java/com/microsoft/graph/http/CoreHttpProvider.java b/src/main/java/com/microsoft/graph/http/CoreHttpProvider.java
index 7dea22c18..31f357643 100644
--- a/src/main/java/com/microsoft/graph/http/CoreHttpProvider.java
+++ b/src/main/java/com/microsoft/graph/http/CoreHttpProvider.java
@@ -98,9 +98,9 @@ public class CoreHttpProvider implements IHttpProvider<Request> {
     private final ILogger logger;
 
     /**
-     * The OkHttpClient that handles all requests
+     * The OkHttpClient(Call.Factory) that handles all requests
      */
-    private OkHttpClient corehttpClient;
+    private Call.Factory corehttpClient;
 
     /**
      * Creates the CoreHttpProvider
@@ -112,7 +112,7 @@ public class CoreHttpProvider implements IHttpProvider<Request> {
     @SuppressFBWarnings
     public CoreHttpProvider(@Nonnull final ISerializer serializer,
             @Nonnull final ILogger logger,
-            @Nonnull final OkHttpClient httpClient) {
+            @Nonnull final Call.Factory httpClient) {
         Objects.requireNonNull(logger, "parameter logger cannot be null");
         Objects.requireNonNull(serializer, "parameter serializer cannot be null");
         Objects.requireNonNull(httpClient, "parameter httpClient cannot be null");