diff --git a/guava/README.md b/guava/README.md
index e8a68a61..12e42ea2 100644
--- a/guava/README.md
+++ b/guava/README.md
@@ -28,7 +28,8 @@ Following table shows the tested working ranges for recent module versions.
 
 | Module version | Min Guava | Default Guava | Max Guava |
 | -------------- | --------- | ------------- | --------- |
-| 2.14           | 14.0      | 21.0          | 30.1-jre  |
+| 2.15           | 14.0      | 23.6.1        | 31.1-jre  |
+| 2.14           | 14.0      | 21.0          | 31.1-jre  |
 | 2.13           | 14.0      | 21.0          | 30.1-jre  |
 | 2.12           | 14.0      | 21.0          | 30.1-jre  |
 | 2.11           | 14.0      | 20.0          | 30.1-jre  |
@@ -37,7 +38,7 @@ Following table shows the tested working ranges for recent module versions.
 
 Notes:
 
-* At the point of testing, `30.1-jre` was the latest available Guava library
+* At the point of testing, `31.1-jre` was the latest available Guava library
 version, so all versions work with the latest Guava
 * "Min Guava" means the earliest version that integration tests pass with
 * "Default Guava" is the dependency specified in module's `pom.xml`: it is used for build, unit tests
diff --git a/guava/pom.xml b/guava/pom.xml
index c8151725..c82cb7b0 100644
--- a/guava/pom.xml
+++ b/guava/pom.xml
@@ -35,14 +35,15 @@ Guava (https://github.com/google/guava) types (currently mostly just collection
   <properties>
     <!-- 19-Jul-2019, tatu: and for 2.10, 18.0 to 20.0 (last pre-Java8 version) -->
     <!-- 02-Aug-2020, tatu: 2.12 raises baseline from 20.0 to 21.0 -->
-    <version.guava>21.0</version.guava>
+    <!-- 28-Feb-2023, tatu: 2.15 raises baseline from 21.x to 23.x -->
+    <version.guava>23.6.1-jre</version.guava>
 
     <!-- Guava 21.0 and later are Java 8 (JRE variant; android one not)
       -->
     <javac.src.version>1.8</javac.src.version>
     <javac.target.version>1.8</javac.target.version>
 
-    <!-- 31-Jul-2020, tatu: remove upper limit for Jackson 2.12; tested up to 29.0-jre -->
+    <!-- 31-Jul-2020, tatu: remove upper limit for Jackson 2.12; tested up to 30.x -->
     <version.guava.osgi>[${version.guava}.0,99)</version.guava.osgi>
 
     <!-- Generate PackageVersion.java into this directory. -->
diff --git a/release-notes/VERSION-2.x b/release-notes/VERSION-2.x
index d44a7360..7d96de93 100644
--- a/release-notes/VERSION-2.x
+++ b/release-notes/VERSION-2.x
@@ -18,7 +18,7 @@ Active Maintainers:
 
 2.15.0 (not yet released)
 
--
+#105: (guava) Update Guava dependency to 23.6.1-jre (from 21.0)
 
 2.14.2 (28-Jan-2023)
 2.14.1 (21-Nov-2022)