diff --git a/java-21-openjdk-portable.spec b/java-21-openjdk-portable.spec
index 3175656..b62b575 100644
--- a/java-21-openjdk-portable.spec
+++ b/java-21-openjdk-portable.spec
@@ -343,7 +343,7 @@
 # but in time of bootstrap of next jdk, it is featurever-1,
 # and this it is better to change it here, on single place
 #global buildjdkver %{featurever}
-%global buildjdkver 17
+%global buildjdkver 20
 # We don't add any LTS designator for STS packages (Fedora and EPEL).
 # We need to explicitly exclude EPEL as it would have the %%{rhel} macro defined.
 %if 0%{?rhel} && !0%{?epel}