diff --git a/Earthfile b/Earthfile
index cf37b70..d9bc05d 100644
--- a/Earthfile
+++ b/Earthfile
@@ -20,8 +20,8 @@ ARG LUET_PROJECT=luet-repo
 
 
 # Spectro Cloud and Kairos tags.
-ARG PE_VERSION=v4.5.0-rc2
-ARG SPECTRO_LUET_VERSION=v1.3.8-alpha4
+ARG PE_VERSION=v4.5.0-rc4
+ARG SPECTRO_LUET_VERSION=v1.3.8-alpha5
 ARG KAIROS_VERSION=v3.1.3
 ARG K3S_FLAVOR_TAG=k3s1
 ARG RKE2_FLAVOR_TAG=rke2r1