diff --git a/pom.xml b/pom.xml
index d99c1167d1a..d0bca4a19b4 100644
--- a/pom.xml
+++ b/pom.xml
@@ -6,7 +6,7 @@
     <name>JMRI</name>
     <groupId>org.jmri</groupId>
     <artifactId>jmri</artifactId>
-    <version>4.15.9-SNAPSHOT</version>
+    <version>4.15.10-SNAPSHOT</version>
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <release.build_user>${user.name}</release.build_user>
diff --git a/release.properties b/release.properties
index 8d835b4d8fc..30eddbbc703 100644
--- a/release.properties
+++ b/release.properties
@@ -5,9 +5,9 @@
 # these are the numbers for the NEXT release from this branch
 release.major=4
 release.minor=15
-release.build=9
+release.build=10
 
-# additional release descriptor for a long-running expermimental difference
+# additional release descriptor for a long-running experimental difference
 # from what is produced by building JMRI/master (e.g. "pjc"). Should not contain
 # dashes (-) or plus signs (+) since these are delimiters in the JMRI version
 release.modifier=