diff --git a/apptainer_source b/apptainer_source
index 642ccad..fa085d7 160000
--- a/apptainer_source
+++ b/apptainer_source
@@ -1 +1 @@
-Subproject commit 642ccad95d0f3f9bbc16275058c7c19a7b0d14e3
+Subproject commit fa085d7e48af53437ee78d5c01529ee244d74be1
diff --git a/fakeroot.rst b/fakeroot.rst
index 13e71f1..ddc8749 100644
--- a/fakeroot.rst
+++ b/fakeroot.rst
@@ -14,7 +14,8 @@ the appearance of running as root.
 the host:
 
 #. If the host is set up to map the current user via ``/etc/subuid`` and
-   ``/etc/subgid`` mapping files, {Project} will use that method first.
+   ``/etc/subgid`` mapping files (or equivalent through libsubid),
+   {Project} will use that method first.
    This is also commonly referred to as "rootless mode" and is the
    method used for example by Podman.
    This mode requires user namespaces to be enabled.
diff --git a/replacements.py b/replacements.py
index f366e03..3fcfd7b 100644
--- a/replacements.py
+++ b/replacements.py
@@ -12,7 +12,7 @@ def variableReplace(app, docname, source):
 # Add the needed variables to be replaced either on code or on text on the next
 # dictionary structure.
 variable_replacements = {
-    "{InstallationVersion}" : "1.4.0-rc.1",
+    "{InstallationVersion}" : "1.4.0-rc.2",
     "{admindocs}" : "https://apptainer.org/docs/admin/main",
     "{version}": "main",
     "{adminversion}": "main",