diff --git a/avatica/core/pom.xml b/avatica/core/pom.xml
index 2dc0bcc..3650e8e 100644
--- a/avatica/core/pom.xml
+++ b/avatica/core/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.calcite.avatica</groupId>
     <artifactId>avatica-parent</artifactId>
-    <version>1.9.0-SNAPSHOT</version>
+    <version>1.9.0</version>
   </parent>
 
   <artifactId>avatica-core</artifactId>
diff --git a/avatica/metrics-dropwizardmetrics3/pom.xml b/avatica/metrics-dropwizardmetrics3/pom.xml
index f9dcb2f..2c9189c 100644
--- a/avatica/metrics-dropwizardmetrics3/pom.xml
+++ b/avatica/metrics-dropwizardmetrics3/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.calcite.avatica</groupId>
     <artifactId>avatica-parent</artifactId>
-    <version>1.9.0-SNAPSHOT</version>
+    <version>1.9.0</version>
   </parent>
 
   <artifactId>avatica-metrics-dropwizardmetrics3</artifactId>
diff --git a/avatica/metrics/pom.xml b/avatica/metrics/pom.xml
index 30e0a5e..7b93abd 100644
--- a/avatica/metrics/pom.xml
+++ b/avatica/metrics/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.calcite.avatica</groupId>
     <artifactId>avatica-parent</artifactId>
-    <version>1.9.0-SNAPSHOT</version>
+    <version>1.9.0</version>
   </parent>
 
   <artifactId>avatica-metrics</artifactId>
diff --git a/avatica/noop-driver/pom.xml b/avatica/noop-driver/pom.xml
index 3ecfb0d..8372ef9 100644
--- a/avatica/noop-driver/pom.xml
+++ b/avatica/noop-driver/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.calcite.avatica</groupId>
     <artifactId>avatica-parent</artifactId>
-    <version>1.9.0-SNAPSHOT</version>
+    <version>1.9.0</version>
   </parent>
 
   <artifactId>avatica-noop-driver</artifactId>
diff --git a/avatica/pom.xml b/avatica/pom.xml
index faf4ef0..f3303c6 100644
--- a/avatica/pom.xml
+++ b/avatica/pom.xml
@@ -29,7 +29,7 @@
   <groupId>org.apache.calcite.avatica</groupId>
   <artifactId>avatica-parent</artifactId>
   <packaging>pom</packaging>
-  <version>1.9.0-SNAPSHOT</version>
+  <version>1.9.0</version>
 
   <!-- More project information. -->
   <name>Apache Calcite Avatica Project</name>
@@ -97,7 +97,7 @@
     <connection>scm:git:https://git-wip-us.apache.org/repos/asf/calcite.git</connection>
     <developerConnection>scm:git:https://git-wip-us.apache.org/repos/asf/calcite.git</developerConnection>
     <url>https://github.com/apache/calcite</url>
-    <tag>HEAD</tag>
+    <tag>calcite-avatica-1.9.0-rc1</tag>
   </scm>
 
   <modules>
diff --git a/avatica/server/pom.xml b/avatica/server/pom.xml
index 7cc600d..567debf 100644
--- a/avatica/server/pom.xml
+++ b/avatica/server/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.calcite.avatica</groupId>
     <artifactId>avatica-parent</artifactId>
-    <version>1.9.0-SNAPSHOT</version>
+    <version>1.9.0</version>
   </parent>
 
   <artifactId>avatica-server</artifactId>
diff --git a/avatica/shaded/core/pom.xml b/avatica/shaded/core/pom.xml
index 45bfbc9..483210f 100644
--- a/avatica/shaded/core/pom.xml
+++ b/avatica/shaded/core/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.calcite.avatica</groupId>
     <artifactId>avatica-parent</artifactId>
-    <version>1.9.0-SNAPSHOT</version>
+    <version>1.9.0</version>
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/avatica/standalone-server/pom.xml b/avatica/standalone-server/pom.xml
index ab36a00..bee15c7 100644
--- a/avatica/standalone-server/pom.xml
+++ b/avatica/standalone-server/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.calcite.avatica</groupId>
     <artifactId>avatica-parent</artifactId>
-    <version>1.9.0-SNAPSHOT</version>
+    <version>1.9.0</version>
   </parent>
   <artifactId>avatica-standalone-server</artifactId>
   <name>Avatica Standalone Server</name>
diff --git a/avatica/tck/pom.xml b/avatica/tck/pom.xml
index 13db75b..d0fdb19 100644
--- a/avatica/tck/pom.xml
+++ b/avatica/tck/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.calcite.avatica</groupId>
     <artifactId>avatica-parent</artifactId>
-    <version>1.9.0-SNAPSHOT</version>
+    <version>1.9.0</version>
   </parent>
 
   <artifactId>avatica-tck</artifactId>