diff --git a/repo2docker/buildpacks/conda/__init__.py b/repo2docker/buildpacks/conda/__init__.py
index d7056ec3..7130931d 100644
--- a/repo2docker/buildpacks/conda/__init__.py
+++ b/repo2docker/buildpacks/conda/__init__.py
@@ -608,7 +608,7 @@ def get_custom_extension_script(self, post):
         jlab4_ext_script = self._get_jlab_extension_script(
             grdm_jlab4_release_tag,
             grdm_jlab4_filename_body,
-            "v2024.04",
+            "2026.07.0",
             perform_labextension_install=False,
             perform_nbextension_install=False,
             perform_jlpm_cache_clean=False,