diff --git a/benchmarks/pom.xml b/benchmarks/pom.xml
index 3ca8405..78dd67e 100644
--- a/benchmarks/pom.xml
+++ b/benchmarks/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <artifactId>zipkin-gcp-parent</artifactId>
     <groupId>io.zipkin.gcp</groupId>
-    <version>2.2.1-SNAPSHOT</version>
+    <version>2.2.1</version>
   </parent>
 
   <artifactId>benchmarks</artifactId>
diff --git a/collector-pubsub/pom.xml b/collector-pubsub/pom.xml
index a77cfb9..d91d98a 100644
--- a/collector-pubsub/pom.xml
+++ b/collector-pubsub/pom.xml
@@ -18,7 +18,7 @@
   <parent>
     <artifactId>zipkin-gcp-parent</artifactId>
     <groupId>io.zipkin.gcp</groupId>
-    <version>2.2.1-SNAPSHOT</version>
+    <version>2.2.1</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
 
diff --git a/encoder-stackdriver-brave/pom.xml b/encoder-stackdriver-brave/pom.xml
index 527f6ee..6bc7db1 100644
--- a/encoder-stackdriver-brave/pom.xml
+++ b/encoder-stackdriver-brave/pom.xml
@@ -18,7 +18,7 @@
   <parent>
     <artifactId>zipkin-gcp-parent</artifactId>
     <groupId>io.zipkin.gcp</groupId>
-    <version>2.2.1-SNAPSHOT</version>
+    <version>2.2.1</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
 
diff --git a/encoder-stackdriver-zipkin/pom.xml b/encoder-stackdriver-zipkin/pom.xml
index f5ce853..92a70f5 100644
--- a/encoder-stackdriver-zipkin/pom.xml
+++ b/encoder-stackdriver-zipkin/pom.xml
@@ -18,7 +18,7 @@
   <parent>
     <artifactId>zipkin-gcp-parent</artifactId>
     <groupId>io.zipkin.gcp</groupId>
-    <version>2.2.1-SNAPSHOT</version>
+    <version>2.2.1</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
 
diff --git a/module/pom.xml b/module/pom.xml
index 34faaa2..a25b101 100644
--- a/module/pom.xml
+++ b/module/pom.xml
@@ -19,7 +19,7 @@
   <parent>
     <groupId>io.zipkin.gcp</groupId>
     <artifactId>zipkin-gcp-parent</artifactId>
-    <version>2.2.1-SNAPSHOT</version>
+    <version>2.2.1</version>
   </parent>
 
   <artifactId>zipkin-module-gcp</artifactId>
diff --git a/pom.xml b/pom.xml
index c9d6e69..a704b76 100644
--- a/pom.xml
+++ b/pom.xml
@@ -19,7 +19,7 @@
 
   <groupId>io.zipkin.gcp</groupId>
   <artifactId>zipkin-gcp-parent</artifactId>
-  <version>2.2.1-SNAPSHOT</version>
+  <version>2.2.1</version>
   <packaging>pom</packaging>
 
   <modules>
@@ -162,7 +162,7 @@
     <url>https://github.com/openzipkin/zipkin-gcp</url>
     <connection>scm:git:https://github.com/openzipkin/zipkin-gcp.git</connection>
     <developerConnection>scm:git:https://github.com/openzipkin/zipkin-gcp.git</developerConnection>
-    <tag>HEAD</tag>
+    <tag>2.2.1</tag>
   </scm>
 
   <!-- Developer section is needed for Maven Central, but doesn't need to include each person -->
diff --git a/propagation-stackdriver/pom.xml b/propagation-stackdriver/pom.xml
index 5a85158..ee0b506 100644
--- a/propagation-stackdriver/pom.xml
+++ b/propagation-stackdriver/pom.xml
@@ -18,7 +18,7 @@
   <parent>
     <artifactId>zipkin-gcp-parent</artifactId>
     <groupId>io.zipkin.gcp</groupId>
-    <version>2.2.1-SNAPSHOT</version>
+    <version>2.2.1</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
 
diff --git a/sender-pubsub/pom.xml b/sender-pubsub/pom.xml
index 3c00c18..33d6683 100644
--- a/sender-pubsub/pom.xml
+++ b/sender-pubsub/pom.xml
@@ -18,7 +18,7 @@
     <parent>
         <artifactId>zipkin-gcp-parent</artifactId>
         <groupId>io.zipkin.gcp</groupId>
-        <version>2.2.1-SNAPSHOT</version>
+        <version>2.2.1</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
diff --git a/sender-stackdriver/pom.xml b/sender-stackdriver/pom.xml
index 31bd4b2..be8a151 100644
--- a/sender-stackdriver/pom.xml
+++ b/sender-stackdriver/pom.xml
@@ -18,7 +18,7 @@
   <parent>
     <artifactId>zipkin-gcp-parent</artifactId>
     <groupId>io.zipkin.gcp</groupId>
-    <version>2.2.1-SNAPSHOT</version>
+    <version>2.2.1</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
 
diff --git a/storage-stackdriver/pom.xml b/storage-stackdriver/pom.xml
index eef8234..c2b8a51 100644
--- a/storage-stackdriver/pom.xml
+++ b/storage-stackdriver/pom.xml
@@ -18,7 +18,7 @@
   <parent>
     <artifactId>zipkin-gcp-parent</artifactId>
     <groupId>io.zipkin.gcp</groupId>
-    <version>2.2.1-SNAPSHOT</version>
+    <version>2.2.1</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
 
diff --git a/translation-stackdriver/pom.xml b/translation-stackdriver/pom.xml
index 7f98e5b..6eab306 100644
--- a/translation-stackdriver/pom.xml
+++ b/translation-stackdriver/pom.xml
@@ -18,7 +18,7 @@
   <parent>
     <artifactId>zipkin-gcp-parent</artifactId>
     <groupId>io.zipkin.gcp</groupId>
-    <version>2.2.1-SNAPSHOT</version>
+    <version>2.2.1</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>