diff --git a/build.gradle b/build.gradle
index 21ed0d6..cdac160 100644
--- a/build.gradle
+++ b/build.gradle
@@ -19,7 +19,7 @@ def VERSIONS = [
     SCALA3        : "3.7.2",
     MAGNUM        : "1.3.1",
     STTP          : "3.11.0",
-    ZIO           : "2.1.20",
+    ZIO           : "2.1.21",
     REST_ASSURED  : "5.5.6",
 ]