diff --git a/proto-google-cloud-texttospeech-v1/src/main/java/com/google/cloud/texttospeech/v1/SynthesisInput.java b/proto-google-cloud-texttospeech-v1/src/main/java/com/google/cloud/texttospeech/v1/SynthesisInput.java
index 327249f7..8cfc897d 100644
--- a/proto-google-cloud-texttospeech-v1/src/main/java/com/google/cloud/texttospeech/v1/SynthesisInput.java
+++ b/proto-google-cloud-texttospeech-v1/src/main/java/com/google/cloud/texttospeech/v1/SynthesisInput.java
@@ -167,6 +167,20 @@ public InputSourceCase getInputSourceCase() {
   }
 
   public static final int TEXT_FIELD_NUMBER = 1;
+  /**
+   *
+   *
+   * <pre>
+   * The raw text to be synthesized.
+   * </pre>
+   *
+   * <code>string text = 1;</code>
+   *
+   * @return Whether the text field is set.
+   */
+  public boolean hasText() {
+    return inputSourceCase_ == 1;
+  }
   /**
    *
    *
@@ -223,6 +237,23 @@ public com.google.protobuf.ByteString getTextBytes() {
   }
 
   public static final int SSML_FIELD_NUMBER = 2;
+  /**
+   *
+   *
+   * <pre>
+   * The SSML document to be synthesized. The SSML document must be valid
+   * and well-formed. Otherwise the RPC will fail and return
+   * [google.rpc.Code.INVALID_ARGUMENT][]. For more information, see
+   * [SSML](https://cloud.google.com/text-to-speech/docs/ssml).
+   * </pre>
+   *
+   * <code>string ssml = 2;</code>
+   *
+   * @return Whether the ssml field is set.
+   */
+  public boolean hasSsml() {
+    return inputSourceCase_ == 2;
+  }
   /**
    *
    *
@@ -666,6 +697,21 @@ public Builder clearInputSource() {
       return this;
     }
 
+    /**
+     *
+     *
+     * <pre>
+     * The raw text to be synthesized.
+     * </pre>
+     *
+     * <code>string text = 1;</code>
+     *
+     * @return Whether the text field is set.
+     */
+    @java.lang.Override
+    public boolean hasText() {
+      return inputSourceCase_ == 1;
+    }
     /**
      *
      *
@@ -785,6 +831,24 @@ public Builder setTextBytes(com.google.protobuf.ByteString value) {
       return this;
     }
 
+    /**
+     *
+     *
+     * <pre>
+     * The SSML document to be synthesized. The SSML document must be valid
+     * and well-formed. Otherwise the RPC will fail and return
+     * [google.rpc.Code.INVALID_ARGUMENT][]. For more information, see
+     * [SSML](https://cloud.google.com/text-to-speech/docs/ssml).
+     * </pre>
+     *
+     * <code>string ssml = 2;</code>
+     *
+     * @return Whether the ssml field is set.
+     */
+    @java.lang.Override
+    public boolean hasSsml() {
+      return inputSourceCase_ == 2;
+    }
     /**
      *
      *
diff --git a/proto-google-cloud-texttospeech-v1/src/main/java/com/google/cloud/texttospeech/v1/SynthesisInputOrBuilder.java b/proto-google-cloud-texttospeech-v1/src/main/java/com/google/cloud/texttospeech/v1/SynthesisInputOrBuilder.java
index 169d1cb5..412be426 100644
--- a/proto-google-cloud-texttospeech-v1/src/main/java/com/google/cloud/texttospeech/v1/SynthesisInputOrBuilder.java
+++ b/proto-google-cloud-texttospeech-v1/src/main/java/com/google/cloud/texttospeech/v1/SynthesisInputOrBuilder.java
@@ -23,6 +23,18 @@ public interface SynthesisInputOrBuilder
     // @@protoc_insertion_point(interface_extends:google.cloud.texttospeech.v1.SynthesisInput)
     com.google.protobuf.MessageOrBuilder {
 
+  /**
+   *
+   *
+   * <pre>
+   * The raw text to be synthesized.
+   * </pre>
+   *
+   * <code>string text = 1;</code>
+   *
+   * @return Whether the text field is set.
+   */
+  boolean hasText();
   /**
    *
    *
@@ -48,6 +60,21 @@ public interface SynthesisInputOrBuilder
    */
   com.google.protobuf.ByteString getTextBytes();
 
+  /**
+   *
+   *
+   * <pre>
+   * The SSML document to be synthesized. The SSML document must be valid
+   * and well-formed. Otherwise the RPC will fail and return
+   * [google.rpc.Code.INVALID_ARGUMENT][]. For more information, see
+   * [SSML](https://cloud.google.com/text-to-speech/docs/ssml).
+   * </pre>
+   *
+   * <code>string ssml = 2;</code>
+   *
+   * @return Whether the ssml field is set.
+   */
+  boolean hasSsml();
   /**
    *
    *
diff --git a/proto-google-cloud-texttospeech-v1beta1/src/main/java/com/google/cloud/texttospeech/v1beta1/SynthesisInput.java b/proto-google-cloud-texttospeech-v1beta1/src/main/java/com/google/cloud/texttospeech/v1beta1/SynthesisInput.java
index 3ab25a4a..2af78ba5 100644
--- a/proto-google-cloud-texttospeech-v1beta1/src/main/java/com/google/cloud/texttospeech/v1beta1/SynthesisInput.java
+++ b/proto-google-cloud-texttospeech-v1beta1/src/main/java/com/google/cloud/texttospeech/v1beta1/SynthesisInput.java
@@ -167,6 +167,20 @@ public InputSourceCase getInputSourceCase() {
   }
 
   public static final int TEXT_FIELD_NUMBER = 1;
+  /**
+   *
+   *
+   * <pre>
+   * The raw text to be synthesized.
+   * </pre>
+   *
+   * <code>string text = 1;</code>
+   *
+   * @return Whether the text field is set.
+   */
+  public boolean hasText() {
+    return inputSourceCase_ == 1;
+  }
   /**
    *
    *
@@ -223,6 +237,23 @@ public com.google.protobuf.ByteString getTextBytes() {
   }
 
   public static final int SSML_FIELD_NUMBER = 2;
+  /**
+   *
+   *
+   * <pre>
+   * The SSML document to be synthesized. The SSML document must be valid
+   * and well-formed. Otherwise the RPC will fail and return
+   * [google.rpc.Code.INVALID_ARGUMENT][]. For more information, see
+   * [SSML](https://cloud.google.com/text-to-speech/docs/ssml).
+   * </pre>
+   *
+   * <code>string ssml = 2;</code>
+   *
+   * @return Whether the ssml field is set.
+   */
+  public boolean hasSsml() {
+    return inputSourceCase_ == 2;
+  }
   /**
    *
    *
@@ -667,6 +698,21 @@ public Builder clearInputSource() {
       return this;
     }
 
+    /**
+     *
+     *
+     * <pre>
+     * The raw text to be synthesized.
+     * </pre>
+     *
+     * <code>string text = 1;</code>
+     *
+     * @return Whether the text field is set.
+     */
+    @java.lang.Override
+    public boolean hasText() {
+      return inputSourceCase_ == 1;
+    }
     /**
      *
      *
@@ -786,6 +832,24 @@ public Builder setTextBytes(com.google.protobuf.ByteString value) {
       return this;
     }
 
+    /**
+     *
+     *
+     * <pre>
+     * The SSML document to be synthesized. The SSML document must be valid
+     * and well-formed. Otherwise the RPC will fail and return
+     * [google.rpc.Code.INVALID_ARGUMENT][]. For more information, see
+     * [SSML](https://cloud.google.com/text-to-speech/docs/ssml).
+     * </pre>
+     *
+     * <code>string ssml = 2;</code>
+     *
+     * @return Whether the ssml field is set.
+     */
+    @java.lang.Override
+    public boolean hasSsml() {
+      return inputSourceCase_ == 2;
+    }
     /**
      *
      *
diff --git a/proto-google-cloud-texttospeech-v1beta1/src/main/java/com/google/cloud/texttospeech/v1beta1/SynthesisInputOrBuilder.java b/proto-google-cloud-texttospeech-v1beta1/src/main/java/com/google/cloud/texttospeech/v1beta1/SynthesisInputOrBuilder.java
index 9ed99112..b8c202e5 100644
--- a/proto-google-cloud-texttospeech-v1beta1/src/main/java/com/google/cloud/texttospeech/v1beta1/SynthesisInputOrBuilder.java
+++ b/proto-google-cloud-texttospeech-v1beta1/src/main/java/com/google/cloud/texttospeech/v1beta1/SynthesisInputOrBuilder.java
@@ -23,6 +23,18 @@ public interface SynthesisInputOrBuilder
     // @@protoc_insertion_point(interface_extends:google.cloud.texttospeech.v1beta1.SynthesisInput)
     com.google.protobuf.MessageOrBuilder {
 
+  /**
+   *
+   *
+   * <pre>
+   * The raw text to be synthesized.
+   * </pre>
+   *
+   * <code>string text = 1;</code>
+   *
+   * @return Whether the text field is set.
+   */
+  boolean hasText();
   /**
    *
    *
@@ -48,6 +60,21 @@ public interface SynthesisInputOrBuilder
    */
   com.google.protobuf.ByteString getTextBytes();
 
+  /**
+   *
+   *
+   * <pre>
+   * The SSML document to be synthesized. The SSML document must be valid
+   * and well-formed. Otherwise the RPC will fail and return
+   * [google.rpc.Code.INVALID_ARGUMENT][]. For more information, see
+   * [SSML](https://cloud.google.com/text-to-speech/docs/ssml).
+   * </pre>
+   *
+   * <code>string ssml = 2;</code>
+   *
+   * @return Whether the ssml field is set.
+   */
+  boolean hasSsml();
   /**
    *
    *
diff --git a/synth.metadata b/synth.metadata
index fa117515..326cc21d 100644
--- a/synth.metadata
+++ b/synth.metadata
@@ -4,23 +4,23 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-texttospeech.git",
-        "sha": "e7c32cb1fbef3d0a5f736d9d6696ad48fbfa0872"
+        "sha": "5278a0bc7ae654596165024e771a0cfa213b3ee7"
       }
     },
     {
       "git": {
         "name": "googleapis",
         "remote": "https://github.com/googleapis/googleapis.git",
-        "sha": "af8f71dae961ee036a0ac52a1965270149a6b2c9",
-        "internalRef": "358516065"
+        "sha": "f6dd7e47620566925a4b3f1ce029e74e1b2f2516",
+        "internalRef": "359781040"
       }
     },
     {
       "git": {
         "name": "googleapis",
         "remote": "https://github.com/googleapis/googleapis.git",
-        "sha": "af8f71dae961ee036a0ac52a1965270149a6b2c9",
-        "internalRef": "358516065"
+        "sha": "f6dd7e47620566925a4b3f1ce029e74e1b2f2516",
+        "internalRef": "359781040"
       }
     },
     {