diff --git a/java-iam/google-iam-policy/pom.xml b/java-iam/google-iam-policy/pom.xml
index 629df0286a06..a849e3637b88 100644
--- a/java-iam/google-iam-policy/pom.xml
+++ b/java-iam/google-iam-policy/pom.xml
@@ -3,7 +3,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-iam-policy</artifactId>
-  <version>1.6.3</version><!-- {x-version-update:google-iam-policy:current} -->
+  <version>1.6.4-SNAPSHOT</version><!-- {x-version-update:google-iam-policy:current} -->
   <packaging>jar</packaging>
   <name>Google IAM Policy</name>
   <url>https://github.com/googleapis/java-eventarc</url>
@@ -11,7 +11,7 @@
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-iam-parent</artifactId>
-    <version>1.6.3</version><!-- {x-version-update:proto-google-iam-v1:current} -->
+    <version>1.6.4-SNAPSHOT</version><!-- {x-version-update:proto-google-iam-v1:current} -->
   </parent>
   <properties>
     <site.installationModule>google-iam-policy</site.installationModule>
diff --git a/java-iam/grpc-google-iam-v1/pom.xml b/java-iam/grpc-google-iam-v1/pom.xml
index 43b5254b0817..013356b1ccd3 100644
--- a/java-iam/grpc-google-iam-v1/pom.xml
+++ b/java-iam/grpc-google-iam-v1/pom.xml
@@ -4,13 +4,13 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.api.grpc</groupId>
   <artifactId>grpc-google-iam-v1</artifactId>
-  <version>1.6.3</version><!-- {x-version-update:proto-google-iam-v1:current} -->
+  <version>1.6.4-SNAPSHOT</version><!-- {x-version-update:proto-google-iam-v1:current} -->
   <name>grpc-google-iam-v1</name>
   <description>GRPC library for grpc-google-iam-v1</description>
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-iam-parent</artifactId>
-    <version>1.6.3</version><!-- {x-version-update:proto-google-iam-v1:current} -->
+    <version>1.6.4-SNAPSHOT</version><!-- {x-version-update:proto-google-iam-v1:current} -->
   </parent>
   <dependencies>
     <dependency>
diff --git a/java-iam/grpc-google-iam-v2/pom.xml b/java-iam/grpc-google-iam-v2/pom.xml
index c78bd1c464af..0a4f7352964e 100644
--- a/java-iam/grpc-google-iam-v2/pom.xml
+++ b/java-iam/grpc-google-iam-v2/pom.xml
@@ -4,13 +4,13 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.api.grpc</groupId>
   <artifactId>grpc-google-iam-v2</artifactId>
-  <version>1.6.3</version><!-- {x-version-update:grpc-google-iam-v2:current} -->
+  <version>1.6.4-SNAPSHOT</version><!-- {x-version-update:grpc-google-iam-v2:current} -->
   <name>grpc-google-iam-v2</name>
   <description>GRPC library for proto-google-iam-v2</description>
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-iam-parent</artifactId>
-    <version>1.6.3</version><!-- {x-version-update:proto-google-iam-v1:current} -->
+    <version>1.6.4-SNAPSHOT</version><!-- {x-version-update:proto-google-iam-v1:current} -->
   </parent>
   <dependencies>
     <dependency>
diff --git a/java-iam/grpc-google-iam-v2beta/pom.xml b/java-iam/grpc-google-iam-v2beta/pom.xml
index b640ffcc53cc..eac3e76c9ba3 100644
--- a/java-iam/grpc-google-iam-v2beta/pom.xml
+++ b/java-iam/grpc-google-iam-v2beta/pom.xml
@@ -4,13 +4,13 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.api.grpc</groupId>
   <artifactId>grpc-google-iam-v2beta</artifactId>
-  <version>1.6.3</version><!-- {x-version-update:grpc-google-iam-v2beta:current} -->
+  <version>1.6.4-SNAPSHOT</version><!-- {x-version-update:grpc-google-iam-v2beta:current} -->
   <name>grpc-google-iam-v2beta</name>
   <description>GRPC library for proto-google-iam-v1</description>
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-iam-parent</artifactId>
-    <version>1.6.3</version><!-- {x-version-update:proto-google-iam-v1:current} -->
+    <version>1.6.4-SNAPSHOT</version><!-- {x-version-update:proto-google-iam-v1:current} -->
   </parent>
   <dependencies>
     <dependency>
diff --git a/java-iam/pom.xml b/java-iam/pom.xml
index 09aa166fa0a7..665c9baeacc7 100644
--- a/java-iam/pom.xml
+++ b/java-iam/pom.xml
@@ -4,7 +4,7 @@
   <groupId>com.google.cloud</groupId>
   <artifactId>google-iam-parent</artifactId>
   <packaging>pom</packaging>
-  <version>1.6.3</version><!-- {x-version-update:proto-google-iam-v1:current} -->
+  <version>1.6.4-SNAPSHOT</version><!-- {x-version-update:proto-google-iam-v1:current} -->
   <name>Google IAM Parent</name>
   <url>https://github.com/googleapis/java-iam</url>
   <description>
@@ -87,37 +87,37 @@
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>proto-google-iam-v2</artifactId>
-        <version>1.6.3</version><!-- {x-version-update:proto-google-iam-v2:current} -->
+        <version>1.6.4-SNAPSHOT</version><!-- {x-version-update:proto-google-iam-v2:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>grpc-google-iam-v2</artifactId>
-        <version>1.6.3</version><!-- {x-version-update:grpc-google-iam-v2:current} -->
+        <version>1.6.4-SNAPSHOT</version><!-- {x-version-update:grpc-google-iam-v2:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-iam-policy</artifactId>
-        <version>1.6.3</version><!-- {x-version-update:google-iam-policy:current} -->
+        <version>1.6.4-SNAPSHOT</version><!-- {x-version-update:google-iam-policy:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>proto-google-iam-v2beta</artifactId>
-        <version>1.6.3</version><!-- {x-version-update:proto-google-iam-v2beta:current} -->
+        <version>1.6.4-SNAPSHOT</version><!-- {x-version-update:proto-google-iam-v2beta:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>grpc-google-iam-v1</artifactId>
-        <version>1.6.3</version><!-- {x-version-update:grpc-google-iam-v1:current} -->
+        <version>1.6.4-SNAPSHOT</version><!-- {x-version-update:grpc-google-iam-v1:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>grpc-google-iam-v2beta</artifactId>
-        <version>1.6.3</version><!-- {x-version-update:grpc-google-iam-v2beta:current} -->
+        <version>1.6.4-SNAPSHOT</version><!-- {x-version-update:grpc-google-iam-v2beta:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>proto-google-iam-v1</artifactId>
-        <version>1.6.3</version><!-- {x-version-update:proto-google-iam-v1:current} -->
+        <version>1.6.4-SNAPSHOT</version><!-- {x-version-update:proto-google-iam-v1:current} -->
       </dependency>
 
       <dependency>
diff --git a/java-iam/proto-google-iam-v1/pom.xml b/java-iam/proto-google-iam-v1/pom.xml
index e736a98c77d5..454140e6613e 100644
--- a/java-iam/proto-google-iam-v1/pom.xml
+++ b/java-iam/proto-google-iam-v1/pom.xml
@@ -3,13 +3,13 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.api.grpc</groupId>
   <artifactId>proto-google-iam-v1</artifactId>
-  <version>1.6.3</version><!-- {x-version-update:proto-google-iam-v1:current} -->
+  <version>1.6.4-SNAPSHOT</version><!-- {x-version-update:proto-google-iam-v1:current} -->
   <name>proto-google-iam-v1</name>
   <description>PROTO library for proto-google-iam-v1</description>
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-iam-parent</artifactId>
-    <version>1.6.3</version><!-- {x-version-update:proto-google-iam-v1:current} -->
+    <version>1.6.4-SNAPSHOT</version><!-- {x-version-update:proto-google-iam-v1:current} -->
   </parent>
   <dependencies>
     <dependency>
diff --git a/java-iam/proto-google-iam-v2/pom.xml b/java-iam/proto-google-iam-v2/pom.xml
index 63d3527db654..b889e473b525 100644
--- a/java-iam/proto-google-iam-v2/pom.xml
+++ b/java-iam/proto-google-iam-v2/pom.xml
@@ -4,13 +4,13 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.api.grpc</groupId>
   <artifactId>proto-google-iam-v2</artifactId>
-  <version>1.6.3</version><!-- {x-version-update:proto-google-iam-v2:current} -->
+  <version>1.6.4-SNAPSHOT</version><!-- {x-version-update:proto-google-iam-v2:current} -->
   <name>proto-google-iam-v2</name>
   <description>Proto library for proto-google-iam-v1</description>
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-iam-parent</artifactId>
-    <version>1.6.3</version><!-- {x-version-update:proto-google-iam-v1:current} -->
+    <version>1.6.4-SNAPSHOT</version><!-- {x-version-update:proto-google-iam-v1:current} -->
   </parent>
   <dependencies>
     <dependency>
diff --git a/java-iam/proto-google-iam-v2beta/pom.xml b/java-iam/proto-google-iam-v2beta/pom.xml
index cca00d33733d..86619e87abd5 100644
--- a/java-iam/proto-google-iam-v2beta/pom.xml
+++ b/java-iam/proto-google-iam-v2beta/pom.xml
@@ -4,13 +4,13 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.api.grpc</groupId>
   <artifactId>proto-google-iam-v2beta</artifactId>
-  <version>1.6.3</version><!-- {x-version-update:proto-google-iam-v2beta:current} -->
+  <version>1.6.4-SNAPSHOT</version><!-- {x-version-update:proto-google-iam-v2beta:current} -->
   <name>proto-google-iam-v2beta</name>
   <description>Proto library for proto-google-iam-v1</description>
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-iam-parent</artifactId>
-    <version>1.6.3</version><!-- {x-version-update:proto-google-iam-v1:current} -->
+    <version>1.6.4-SNAPSHOT</version><!-- {x-version-update:proto-google-iam-v1:current} -->
   </parent>
   <dependencies>
     <dependency>
diff --git a/java-iam/versions.txt b/java-iam/versions.txt
index 85e9350d0828..41e9439d261a 100644
--- a/java-iam/versions.txt
+++ b/java-iam/versions.txt
@@ -1,10 +1,10 @@
 # Format:
 # module:released-version:current-version
 
-proto-google-iam-v1:1.6.3:1.6.3
-grpc-google-iam-v1:1.6.3:1.6.3
-proto-google-iam-v2beta:1.6.3:1.6.3
-grpc-google-iam-v2beta:1.6.3:1.6.3
-google-iam-policy:1.6.3:1.6.3
-proto-google-iam-v2:1.6.3:1.6.3
-grpc-google-iam-v2:1.6.3:1.6.3
+proto-google-iam-v1:1.6.3:1.6.4-SNAPSHOT
+grpc-google-iam-v1:1.6.3:1.6.4-SNAPSHOT
+proto-google-iam-v2beta:1.6.3:1.6.4-SNAPSHOT
+grpc-google-iam-v2beta:1.6.3:1.6.4-SNAPSHOT
+google-iam-policy:1.6.3:1.6.4-SNAPSHOT
+proto-google-iam-v2:1.6.3:1.6.4-SNAPSHOT
+grpc-google-iam-v2:1.6.3:1.6.4-SNAPSHOT