diff --git a/.fern/metadata.json b/.fern/metadata.json
index 83dc364..836c12f 100644
--- a/.fern/metadata.json
+++ b/.fern/metadata.json
@@ -1,14 +1,14 @@
 {
-  "cliVersion": "5.68.0",
+  "cliVersion": "5.75.0",
   "generatorName": "fernapi/fern-java-sdk",
-  "generatorVersion": "4.13.3",
+  "generatorVersion": "4.14.4",
   "generatorConfig": {
     "client-class-name": "Lattice",
     "package-prefix": "com.anduril"
   },
-  "originGitCommit": "8321bd837c4be3b7b8cb046c8c7e8b0e898ce550",
+  "originGitCommit": "4999fd7a01ac9b12158b89b220c932e4149a13ba",
   "originGitCommitIsDirty": false,
   "invokedBy": "manual",
-  "requestedVersion": "5.18.0",
-  "sdkVersion": "5.18.0"
+  "requestedVersion": "5.19.0",
+  "sdkVersion": "5.19.0"
 }
\ No newline at end of file
diff --git a/README.md b/README.md
index 9e7da5b..a873c77 100644
--- a/README.md
+++ b/README.md
@@ -41,7 +41,7 @@ Add the dependency in your `build.gradle` file:
 
 ```groovy
 dependencies {
-  implementation 'com.anduril:lattice-sdk:5.18.0'
+  implementation 'com.anduril:lattice-sdk:5.19.0'
 }
 ```
 
@@ -53,7 +53,7 @@ Add the dependency in your `pom.xml` file:
 <dependency>
   <groupId>com.anduril</groupId>
   <artifactId>lattice-sdk</artifactId>
-  <version>5.18.0</version>
+  <version>5.19.0</version>
 </dependency>
 ```
 
diff --git a/build.gradle b/build.gradle
index 3deb296..dca81d6 100644
--- a/build.gradle
+++ b/build.gradle
@@ -57,7 +57,7 @@ java {
 
 group = 'com.anduril'
 
-version = '5.18.0'
+version = '5.19.0'
 
 jar {
     dependsOn(":generatePomFileForMavenPublication")
@@ -88,7 +88,7 @@ publishing {
         maven(MavenPublication) {
             groupId = 'com.anduril'
             artifactId = 'lattice-sdk'
-            version = '5.18.0'
+            version = '5.19.0'
             from components.java
             pom {
                 name = 'Anduril Industries, Inc.'
diff --git a/changelog.md b/changelog.md
new file mode 100644
index 0000000..bcda61b
--- /dev/null
+++ b/changelog.md
@@ -0,0 +1,4 @@
+# Changelog
+
+## [5.19.0] - 2026-07-16
+
diff --git a/src/main/java/com/anduril/core/ClientOptions.java b/src/main/java/com/anduril/core/ClientOptions.java
index b46f87f..fafa637 100644
--- a/src/main/java/com/anduril/core/ClientOptions.java
+++ b/src/main/java/com/anduril/core/ClientOptions.java
@@ -47,10 +47,10 @@ private ClientOptions(
         this.headers.putAll(headers);
         this.headers.putAll(new HashMap<String, String>() {
             {
-                put("User-Agent", "com.anduril.lattice-sdk/5.18.0");
+                put("User-Agent", "com.anduril.lattice-sdk/5.19.0");
                 put("X-Fern-Language", "JAVA");
                 put("X-Fern-SDK-Name", "com.anduril:lattice-sdk");
-                put("X-Fern-SDK-Version", "5.18.0");
+                put("X-Fern-SDK-Version", "5.19.0");
             }
         });
         this.headerSuppliers = headerSuppliers;
@@ -153,7 +153,9 @@ public Builder environment(Environment environment) {
         }
 
         public Builder addHeader(String key, String value) {
-            this.headers.put(key, value);
+            if (value != null) {
+                this.headers.put(key, value);
+            }
             return this;
         }