diff --git a/envs/requirements.txt b/envs/requirements.txt
index eeb72bbe..77e0b31a 100644
--- a/envs/requirements.txt
+++ b/envs/requirements.txt
@@ -13,7 +13,7 @@ imageio==2.34.0
 importlib_metadata==7.1.0
 importlib_resources==6.4.0
 itk==5.4rc3
-itk-core==5.4rc3
+itk-core==6.0a1
 itk-elastix==0.19.2
 itk-filtering==5.4rc3
 itk-io==5.4rc3