diff --git a/CHANGELOG.md b/CHANGELOG.md
index 31e59a20..3aa26feb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Optimizely Android X SDK Changelog
 
+## 5.1.1
+January 20th, 2025
+
+### Enhancements and fixes
+* Upgrade Java Core SDK to 4.3.1 from 4.3.0.
+* Excludes CMAB from UserProfileService.
+* Fixes missing bucketing reasons in CMAB decision path.
+
 ## 5.1.0
 December 19th, 2025
 
diff --git a/build.gradle b/build.gradle
index 014eba00..e40636d0 100644
--- a/build.gradle
+++ b/build.gradle
@@ -97,7 +97,7 @@ ext {
     build_tools_version = "35.0.0"
     min_sdk_version = 21
     target_sdk_version = 35
-    java_core_ver = "4.3.0"
+    java_core_ver = "4.3.1"
     android_logger_ver = "1.3.6"
     jacksonversion= "2.11.2"
     annotations_ver = "1.2.0"