diff --git a/tools/ReplaceCallbackUrls/build.gradle b/tools/ReplaceCallbackUrls/build.gradle
index 8edfa6d8..9923a3bc 100644
--- a/tools/ReplaceCallbackUrls/build.gradle
+++ b/tools/ReplaceCallbackUrls/build.gradle
@@ -33,5 +33,5 @@ repositories {
 dependencies {
     compile group: 'org.apache.poi', name: 'poi', version: '4.1.0'
     compile group: 'org.apache.poi', name: 'poi-ooxml', version: '4.1.0'
-    compile group: 'org.yaml', name: 'snakeyaml', version: '1.21'
+    compile group: 'org.yaml', name: 'snakeyaml', version: '1.33'
 }