diff --git a/base/pom.xml b/base/pom.xml
index 94041a1..3f80b2d 100644
--- a/base/pom.xml
+++ b/base/pom.xml
@@ -237,6 +237,23 @@ of Jackson: application code should only rely on `jackson-bom`
               </resources>
             </configuration>
           </execution>
+          <!-- 04-May-2024, tatu: For [core#1264] need "cleansed" version
+            -->
+          <execution>
+            <id>regex-property</id>
+            <!-- default phase is "validate" as per https://www.mojohaus.org/build-helper-maven-plugin/usage.html
+              -->
+            <goals>
+              <goal>regex-property</goal>
+            </goals>
+            <configuration>
+              <name>project.version.underscore</name>
+              <value>${project.version}</value>
+              <regex>\.</regex>
+              <replacement>_</replacement>
+              <failIfNoMatch>true</failIfNoMatch>
+            </configuration>
+          </execution>
         </executions>
       </plugin>
       <!-- 27-Nov-2022, tatu: [bom#56] Configure Felix-bundle and maven-jar plugins to
diff --git a/release-notes/VERSION-2.x b/release-notes/VERSION-2.x
index 06feb6f..8f1bdac 100644
--- a/release-notes/VERSION-2.x
+++ b/release-notes/VERSION-2.x
@@ -13,6 +13,8 @@ Jackson components (core, modules)
 
 #68: Remove `junit` 4.x dependency from `jackson-base` 2.18.x to help
   junit5 migration
+- `base/pom.xml` now creates '${project.version.underscore}` for "cleansed"
+  version of `${project.version}`
 
 2.17.0 (12-Mar-2024)