diff --git a/java/src/org/openqa/selenium/remote/HttpSessionId.java b/java/src/org/openqa/selenium/remote/HttpSessionId.java
index 930f2efae20cd..9e092e683503e 100644
--- a/java/src/org/openqa/selenium/remote/HttpSessionId.java
+++ b/java/src/org/openqa/selenium/remote/HttpSessionId.java
@@ -18,7 +18,9 @@
 package org.openqa.selenium.remote;
 
 import java.util.Optional;
+import org.jspecify.annotations.NullMarked;
 
+@NullMarked
 public class HttpSessionId {
 
   private HttpSessionId() {
diff --git a/java/src/org/openqa/selenium/remote/Response.java b/java/src/org/openqa/selenium/remote/Response.java
index e4ba97c0bc21e..1dbd25c6d81c7 100644
--- a/java/src/org/openqa/selenium/remote/Response.java
+++ b/java/src/org/openqa/selenium/remote/Response.java
@@ -20,14 +20,17 @@
 import java.util.Map;
 import java.util.Objects;
 import java.util.Optional;
+import org.jspecify.annotations.NullMarked;
+import org.jspecify.annotations.Nullable;
 
+@NullMarked
 public class Response {
 
-  private volatile Object value;
-  private volatile String sessionId;
+  private volatile @Nullable Object value;
+  private volatile @Nullable String sessionId;
   @Deprecated // (forRemoval = true)
-  private volatile Integer status;
-  private volatile String state;
+  private volatile @Nullable Integer status;
+  private volatile @Nullable String state;
 
   public Response() {}
 
@@ -36,36 +39,36 @@ public Response(SessionId sessionId) {
   }
 
   @Deprecated // (forRemoval = true)
-  public Integer getStatus() {
+  public @Nullable Integer getStatus() {
     return status;
   }
 
   @Deprecated // (forRemoval = true)
-  public void setStatus(Integer status) {
+  public void setStatus(@Nullable Integer status) {
     this.status = status;
   }
 
-  public String getState() {
+  public @Nullable String getState() {
     return state;
   }
 
-  public void setState(String state) {
+  public void setState(@Nullable String state) {
     this.state = state;
   }
 
-  public void setValue(Object value) {
+  public void setValue(@Nullable Object value) {
     this.value = value;
   }
 
-  public Object getValue() {
+  public @Nullable Object getValue() {
     return value;
   }
 
-  public void setSessionId(String sessionId) {
+  public void setSessionId(@Nullable String sessionId) {
     this.sessionId = sessionId;
   }
 
-  public String getSessionId() {
+  public @Nullable String getSessionId() {
     return sessionId;
   }
 
@@ -76,7 +79,7 @@ public String toString() {
   }
 
   @Override
-  public boolean equals(Object o) {
+  public boolean equals(@Nullable Object o) {
     if (!(o instanceof Response)) {
       return false;
     }
diff --git a/java/src/org/openqa/selenium/remote/SessionId.java b/java/src/org/openqa/selenium/remote/SessionId.java
index da0ae7dfe0e69..707b69bc0876b 100644
--- a/java/src/org/openqa/selenium/remote/SessionId.java
+++ b/java/src/org/openqa/selenium/remote/SessionId.java
@@ -20,9 +20,12 @@
 import java.io.Serializable;
 import java.util.Map;
 import java.util.UUID;
+import org.jspecify.annotations.NullMarked;
+import org.jspecify.annotations.Nullable;
 import org.openqa.selenium.internal.Require;
 import org.openqa.selenium.json.JsonException;
 
+@NullMarked
 public class SessionId implements Serializable {
 
   private final String opaqueKey;
@@ -46,7 +49,7 @@ public int hashCode() {
   }
 
   @Override
-  public boolean equals(Object obj) {
+  public boolean equals(@Nullable Object obj) {
     return obj instanceof SessionId && opaqueKey.equals(((SessionId) obj).opaqueKey);
   }