diff --git a/versions/2021.06/init/Magic_Castle/bash b/versions/2021.06/init/Magic_Castle/bash
new file mode 100644
index 0000000000..5f149c817f
--- /dev/null
+++ b/versions/2021.06/init/Magic_Castle/bash
@@ -0,0 +1,3 @@
+/cvmfs/pilot.eessi-hpc.org/versions/2021.06/init/print_deprecation_warning.sh
+
+source /cvmfs/pilot.eessi-hpc.org/versions/2021.12/init/Magic_Castle/bash
diff --git a/versions/2021.06/init/bash b/versions/2021.06/init/bash
new file mode 100644
index 0000000000..82a078849a
--- /dev/null
+++ b/versions/2021.06/init/bash
@@ -0,0 +1,3 @@
+/cvmfs/pilot.eessi-hpc.org/versions/2021.06/init/print_deprecation_warning.sh
+
+source /cvmfs/pilot.eessi-hpc.org/versions/2021.12/init/bash
diff --git a/versions/2021.06/init/print_deprecation_warning.sh b/versions/2021.06/init/print_deprecation_warning.sh
new file mode 100755
index 0000000000..b721ed2f71
--- /dev/null
+++ b/versions/2021.06/init/print_deprecation_warning.sh
@@ -0,0 +1,19 @@
+#!/bin/bash
+function echo_yellow_stderr() {
+    echo -e "\e[33m${1}\e[0m" >&2
+}
+
+echo_yellow_stderr
+echo_yellow_stderr "WARNING: Version 2021.06 of the EESSI pilot repository has been removed since 16 May 2023."
+echo_yellow_stderr
+echo_yellow_stderr "Version 2021.12 of the EESSI pilot repository can be used as a drop-in replacement, "
+echo_yellow_stderr "so we have prepared your environment to use that instead."
+echo_yellow_stderr
+echo_yellow_stderr "In the future, please run"
+echo_yellow_stderr
+echo_yellow_stderr "    source /cvmfs/pilot.eessi-hpc.org/latest/init/bash"
+echo_yellow_stderr
+echo_yellow_stderr "to prepare your start using the EESSI pilot repository."
+echo_yellow_stderr
+echo_yellow_stderr "See also https://eessi.github.io/docs/using_eessi/setting_up_environment ."
+echo_yellow_stderr