diff --git a/CHANGELOG.md b/CHANGELOG.md
index 384792e0..d00e77b1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [1.0.0](https://www.github.com/googleapis/java-workflows/compare/v0.4.2...v1.0.0) (2021-05-26)
+
+
+### Features
+
+* promote to 1.0.0 ([#267](https://www.github.com/googleapis/java-workflows/issues/267)) ([91404ce](https://www.github.com/googleapis/java-workflows/commit/91404cef3b9cef16c0e0c1e322a9eda0d4f80b24))
+
 ### [0.4.2](https://www.github.com/googleapis/java-workflows/compare/v0.4.1...v0.4.2) (2021-05-19)
 
 
diff --git a/google-cloud-workflows-bom/pom.xml b/google-cloud-workflows-bom/pom.xml
index 593d6653..ba4cd440 100644
--- a/google-cloud-workflows-bom/pom.xml
+++ b/google-cloud-workflows-bom/pom.xml
@@ -3,7 +3,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-workflows-bom</artifactId>
-  <version>0.4.3-SNAPSHOT</version><!-- {x-version-update:google-cloud-workflows:current} -->
+  <version>1.0.0</version><!-- {x-version-update:google-cloud-workflows:current} -->
   <packaging>pom</packaging>
   <parent>
     <groupId>com.google.cloud</groupId>
@@ -67,27 +67,27 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-workflows</artifactId>
-        <version>0.4.3-SNAPSHOT</version><!-- {x-version-update:google-cloud-workflows:current} -->
+        <version>1.0.0</version><!-- {x-version-update:google-cloud-workflows:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>grpc-google-cloud-workflows-v1beta</artifactId>
-        <version>0.4.3-SNAPSHOT</version><!-- {x-version-update:grpc-google-cloud-workflows-v1beta:current} -->
+        <version>0.5.0</version><!-- {x-version-update:grpc-google-cloud-workflows-v1beta:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>grpc-google-cloud-workflows-v1</artifactId>
-        <version>0.4.3-SNAPSHOT</version><!-- {x-version-update:grpc-google-cloud-workflows-v1:current} -->
+        <version>1.0.0</version><!-- {x-version-update:grpc-google-cloud-workflows-v1:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>proto-google-cloud-workflows-v1beta</artifactId>
-        <version>0.4.3-SNAPSHOT</version><!-- {x-version-update:proto-google-cloud-workflows-v1beta:current} -->
+        <version>0.5.0</version><!-- {x-version-update:proto-google-cloud-workflows-v1beta:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>proto-google-cloud-workflows-v1</artifactId>
-        <version>0.4.3-SNAPSHOT</version><!-- {x-version-update:proto-google-cloud-workflows-v1:current} -->
+        <version>1.0.0</version><!-- {x-version-update:proto-google-cloud-workflows-v1:current} -->
       </dependency>
     </dependencies>
   </dependencyManagement>
diff --git a/google-cloud-workflows/pom.xml b/google-cloud-workflows/pom.xml
index 5e3f0698..7c34523d 100644
--- a/google-cloud-workflows/pom.xml
+++ b/google-cloud-workflows/pom.xml
@@ -3,7 +3,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-workflows</artifactId>
-  <version>0.4.3-SNAPSHOT</version><!-- {x-version-update:google-cloud-workflows:current} -->
+  <version>1.0.0</version><!-- {x-version-update:google-cloud-workflows:current} -->
   <packaging>jar</packaging>
   <name>Google Cloud Workflows</name>
   <url>https://github.com/googleapis/java-workflows</url>
@@ -11,7 +11,7 @@
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-workflows-parent</artifactId>
-    <version>0.4.3-SNAPSHOT</version><!-- {x-version-update:google-cloud-workflows:current} -->
+    <version>1.0.0</version><!-- {x-version-update:google-cloud-workflows:current} -->
   </parent>
   <properties>
     <site.installationModule>google-cloud-workflows</site.installationModule>
diff --git a/grpc-google-cloud-workflows-v1/pom.xml b/grpc-google-cloud-workflows-v1/pom.xml
index 91d02491..074b7e55 100644
--- a/grpc-google-cloud-workflows-v1/pom.xml
+++ b/grpc-google-cloud-workflows-v1/pom.xml
@@ -4,13 +4,13 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.api.grpc</groupId>
   <artifactId>grpc-google-cloud-workflows-v1</artifactId>
-  <version>0.4.3-SNAPSHOT</version><!-- {x-version-update:grpc-google-cloud-workflows-v1:current} -->
+  <version>1.0.0</version><!-- {x-version-update:grpc-google-cloud-workflows-v1:current} -->
   <name>grpc-google-cloud-workflows-v1</name>
   <description>GRPC library for google-cloud-workflows</description>
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-workflows-parent</artifactId>
-    <version>0.4.3-SNAPSHOT</version><!-- {x-version-update:google-cloud-workflows:current} -->
+    <version>1.0.0</version><!-- {x-version-update:google-cloud-workflows:current} -->
   </parent>
   <dependencies>
     <dependency>
diff --git a/grpc-google-cloud-workflows-v1beta/pom.xml b/grpc-google-cloud-workflows-v1beta/pom.xml
index d380870a..85865926 100644
--- a/grpc-google-cloud-workflows-v1beta/pom.xml
+++ b/grpc-google-cloud-workflows-v1beta/pom.xml
@@ -4,13 +4,13 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.api.grpc</groupId>
   <artifactId>grpc-google-cloud-workflows-v1beta</artifactId>
-  <version>0.4.3-SNAPSHOT</version><!-- {x-version-update:grpc-google-cloud-workflows-v1beta:current} -->
+  <version>0.5.0</version><!-- {x-version-update:grpc-google-cloud-workflows-v1beta:current} -->
   <name>grpc-google-cloud-workflows-v1beta</name>
   <description>GRPC library for google-cloud-workflows</description>
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-workflows-parent</artifactId>
-    <version>0.4.3-SNAPSHOT</version><!-- {x-version-update:google-cloud-workflows:current} -->
+    <version>1.0.0</version><!-- {x-version-update:google-cloud-workflows:current} -->
   </parent>
   <dependencies>
     <dependency>
diff --git a/pom.xml b/pom.xml
index a7e87ae5..0b964fad 100644
--- a/pom.xml
+++ b/pom.xml
@@ -4,7 +4,7 @@
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-workflows-parent</artifactId>
   <packaging>pom</packaging>
-  <version>0.4.3-SNAPSHOT</version><!-- {x-version-update:google-cloud-workflows:current} -->
+  <version>1.0.0</version><!-- {x-version-update:google-cloud-workflows:current} -->
   <name>Google Cloud Workflows Parent</name>
   <url>https://github.com/googleapis/java-</url>
   <description>
@@ -70,27 +70,27 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-workflows</artifactId>
-        <version>0.4.3-SNAPSHOT</version><!-- {x-version-update:google-cloud-workflows:current} -->
+        <version>1.0.0</version><!-- {x-version-update:google-cloud-workflows:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>proto-google-cloud-workflows-v1</artifactId>
-        <version>0.4.3-SNAPSHOT</version><!-- {x-version-update:proto-google-cloud-workflows-v1:current} -->
+        <version>1.0.0</version><!-- {x-version-update:proto-google-cloud-workflows-v1:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>grpc-google-cloud-workflows-v1</artifactId>
-        <version>0.4.3-SNAPSHOT</version><!-- {x-version-update:grpc-google-cloud-workflows-v1:current} -->
+        <version>1.0.0</version><!-- {x-version-update:grpc-google-cloud-workflows-v1:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>proto-google-cloud-workflows-v1beta</artifactId>
-        <version>0.4.3-SNAPSHOT</version><!-- {x-version-update:proto-google-cloud-workflows-v1beta:current} -->
+        <version>0.5.0</version><!-- {x-version-update:proto-google-cloud-workflows-v1beta:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>grpc-google-cloud-workflows-v1beta</artifactId>
-        <version>0.4.3-SNAPSHOT</version><!-- {x-version-update:grpc-google-cloud-workflows-v1beta:current} -->
+        <version>0.5.0</version><!-- {x-version-update:grpc-google-cloud-workflows-v1beta:current} -->
       </dependency>
 
       <dependency>
diff --git a/proto-google-cloud-workflows-v1/pom.xml b/proto-google-cloud-workflows-v1/pom.xml
index 0364a71b..58237951 100644
--- a/proto-google-cloud-workflows-v1/pom.xml
+++ b/proto-google-cloud-workflows-v1/pom.xml
@@ -4,13 +4,13 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.api.grpc</groupId>
   <artifactId>proto-google-cloud-workflows-v1</artifactId>
-  <version>0.4.3-SNAPSHOT</version><!-- {x-version-update:proto-google-cloud-workflows-v1:current} -->
+  <version>1.0.0</version><!-- {x-version-update:proto-google-cloud-workflows-v1:current} -->
   <name>proto-google-cloud-workflows-v1</name>
   <description>Proto library for google-cloud-workflows</description>
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-workflows-parent</artifactId>
-    <version>0.4.3-SNAPSHOT</version><!-- {x-version-update:google-cloud-workflows:current} -->
+    <version>1.0.0</version><!-- {x-version-update:google-cloud-workflows:current} -->
   </parent>
   <dependencies>
     <dependency>
diff --git a/proto-google-cloud-workflows-v1beta/pom.xml b/proto-google-cloud-workflows-v1beta/pom.xml
index bb9a5999..d7ca30b2 100644
--- a/proto-google-cloud-workflows-v1beta/pom.xml
+++ b/proto-google-cloud-workflows-v1beta/pom.xml
@@ -4,13 +4,13 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.api.grpc</groupId>
   <artifactId>proto-google-cloud-workflows-v1beta</artifactId>
-  <version>0.4.3-SNAPSHOT</version><!-- {x-version-update:proto-google-cloud-workflows-v1beta:current} -->
+  <version>0.5.0</version><!-- {x-version-update:proto-google-cloud-workflows-v1beta:current} -->
   <name>proto-google-cloud-workflows-v1beta</name>
   <description>Proto library for google-cloud-workflows</description>
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-workflows-parent</artifactId>
-    <version>0.4.3-SNAPSHOT</version><!-- {x-version-update:google-cloud-workflows:current} -->
+    <version>1.0.0</version><!-- {x-version-update:google-cloud-workflows:current} -->
   </parent>
   <dependencies>
     <dependency>
diff --git a/samples/snapshot/pom.xml b/samples/snapshot/pom.xml
index 0d443628..734f6bbe 100644
--- a/samples/snapshot/pom.xml
+++ b/samples/snapshot/pom.xml
@@ -28,7 +28,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-workflows</artifactId>
-      <version>0.4.3-SNAPSHOT</version>
+      <version>1.0.0</version>
     </dependency>
     <!-- {x-version-update-end} -->
 
diff --git a/versions.txt b/versions.txt
index 78a40e5f..216d4b13 100644
--- a/versions.txt
+++ b/versions.txt
@@ -1,8 +1,8 @@
 # Format:
 # module:released-version:current-version
 
-google-cloud-workflows:0.4.2:0.4.3-SNAPSHOT
-grpc-google-cloud-workflows-v1beta:0.4.2:0.4.3-SNAPSHOT
-grpc-google-cloud-workflows-v1:0.4.2:0.4.3-SNAPSHOT
-proto-google-cloud-workflows-v1beta:0.4.2:0.4.3-SNAPSHOT
-proto-google-cloud-workflows-v1:0.4.2:0.4.3-SNAPSHOT
+google-cloud-workflows:1.0.0:1.0.0
+grpc-google-cloud-workflows-v1beta:0.5.0:0.5.0
+grpc-google-cloud-workflows-v1:1.0.0:1.0.0
+proto-google-cloud-workflows-v1beta:0.5.0:0.5.0
+proto-google-cloud-workflows-v1:1.0.0:1.0.0