diff --git a/addOns/authhelper/CHANGELOG.md b/addOns/authhelper/CHANGELOG.md
index e5c58b0e74..1e0f4a94cf 100644
--- a/addOns/authhelper/CHANGELOG.md
+++ b/addOns/authhelper/CHANGELOG.md
@@ -4,7 +4,8 @@ All notable changes to this add-on will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## Unreleased
-
+### Changed
+- Reduce add-on size.
 
 ## [0.19.0] - 2025-02-04
 ### Added
diff --git a/addOns/authhelper/authhelper.gradle.kts b/addOns/authhelper/authhelper.gradle.kts
index f57e48808d..735a2f7668 100644
--- a/addOns/authhelper/authhelper.gradle.kts
+++ b/addOns/authhelper/authhelper.gradle.kts
@@ -74,7 +74,10 @@ dependencies {
     zapAddOn("client")
     zapAddOn("zest")
 
-    implementation("com.github.bastiaanjansen:otp-java:2.1.0")
+    implementation("com.github.bastiaanjansen:otp-java:2.1.0") {
+        // Provided by ZAP.
+        exclude(group = "commons-codec", module = "commons-codec")
+    }
 
     testImplementation(project(":testutils"))
 }