diff --git a/gradle.properties b/gradle.properties
index ef469dd..42a9e6c 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -6,7 +6,7 @@ version             = 1.0
 # Note that if --release is added then -target and -source are ignored.
 javacRelease = 8
 
-assertjVersion         = 3.25.1
+assertjVersion         = 3.26.3
 assertjJodaTimeVersion = 2.2.0
 assertjDbVersion       = 2.0.2
 ota4jVersion           = 1.2.0