diff --git a/build_library/catalyst.sh b/build_library/catalyst.sh
index fab4a947c1..4706007c40 100644
--- a/build_library/catalyst.sh
+++ b/build_library/catalyst.sh
@@ -3,6 +3,11 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+# Before doing anything, ensure we have at least Catalyst 4.
+if catalyst --version | grep -q "Catalyst [0-3]\."; then
+    sudo emerge -v1 ">=dev-util/catalyst-4" || exit 1
+fi
+
 # common.sh should be sourced first
 [[ -n "${DEFAULT_BUILD_ROOT}" ]] || exit 1
 . "${SCRIPTS_DIR}/sdk_lib/sdk_util.sh" || exit 1