diff --git a/java/src/org/openqa/selenium/chromium/BUILD.bazel b/java/src/org/openqa/selenium/chromium/BUILD.bazel
index 9b14784d4ec23..2b05e31f1f84b 100644
--- a/java/src/org/openqa/selenium/chromium/BUILD.bazel
+++ b/java/src/org/openqa/selenium/chromium/BUILD.bazel
@@ -1,5 +1,6 @@
 load("//java:defs.bzl", "java_export")
 load("//java:version.bzl", "SE_VERSION")
+load("//java:defs.bzl", "artifact", "java_export", "java_library")
 
 java_export(
     name = "chromium",
@@ -19,5 +20,6 @@ java_export(
         "//java:auto-service",
         "//java/src/org/openqa/selenium/json",
         "//java/src/org/openqa/selenium/remote",
+        artifact("org.jspecify:jspecify:1.0.0"),
     ],
 )
diff --git a/java/src/org/openqa/selenium/chromium/ChromiumDriver.java b/java/src/org/openqa/selenium/chromium/ChromiumDriver.java
index 437d7063801d6..f467403ae3c46 100644
--- a/java/src/org/openqa/selenium/chromium/ChromiumDriver.java
+++ b/java/src/org/openqa/selenium/chromium/ChromiumDriver.java
@@ -20,6 +20,9 @@
 import static org.openqa.selenium.remote.Browser.CHROME;
 import static org.openqa.selenium.remote.Browser.EDGE;
 import static org.openqa.selenium.remote.Browser.OPERA;
+import org.jspecify.annotations.NullMarked;
+import org.jspecify.annotations.Nullable;
+
 
 import java.net.URI;
 import java.net.URISyntaxException;
@@ -67,6 +70,7 @@
  * A {@link WebDriver} implementation that controls a Chromium browser running on the local machine.
  * It is used as the base class for Chromium-based browser drivers (Chrome, Edge).
  */
+@NullMarked
 public class ChromiumDriver extends RemoteWebDriver
     implements HasAuthentication,
         HasBiDi,
@@ -90,8 +94,11 @@ public class ChromiumDriver extends RemoteWebDriver
   private final Optional<DevTools> devTools;
   private final Optional<URI> biDiUri;
   private final Optional<BiDi> biDi;
-  protected HasCasting casting;
-  protected HasCdp cdp;
+  /** May be null when the driver does not support casting; initialized during setup if available. */
+  protected @Nullable HasCasting casting;
+  /** May be null when CDP is unavailable for the current browser/session. */
+  protected @Nullable HasCdp cdp;
+
   private final Map<Integer, ScriptKey> scriptKeys = new HashMap<>();
 
   protected ChromiumDriver(