Update changelog.

Change-Id: Icfdc575a5ad4a1c122d34945577b9d2290042bc3
diff --git a/changelog.txt b/changelog.txt
index 45178ed..de04499 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -1,3 +1,7 @@
+0.5.3
+
+- Fix a crashing bug in PrepareDependenciesTask
+
 0.5.2
 
 - Better error reporting for cmd line tools, especially