diff --git a/tests/bsim/bluetooth/ll/edtt/gatt_test_app/prj_llcp.conf b/tests/bsim/bluetooth/ll/edtt/gatt_test_app/prj_llcp.conf
index 1fdcd1a770f..cf1e71513c9 100644
--- a/tests/bsim/bluetooth/ll/edtt/gatt_test_app/prj_llcp.conf
+++ b/tests/bsim/bluetooth/ll/edtt/gatt_test_app/prj_llcp.conf
@@ -24,3 +24,5 @@ CONFIG_BT_CTLR_RX_BUFFERS=3
 
 # To make DEVICE Name writable...
 CONFIG_BT_DEVICE_NAME_DYNAMIC=y
+
+CONFIG_MBEDTLS_PSA_KEY_SLOT_COUNT=32
diff --git a/tests/bsim/bluetooth/mesh/prj.conf b/tests/bsim/bluetooth/mesh/prj.conf
index bd5c2d2ec47..522a49e2d11 100644
--- a/tests/bsim/bluetooth/mesh/prj.conf
+++ b/tests/bsim/bluetooth/mesh/prj.conf
@@ -73,3 +73,5 @@ CONFIG_BT_TESTING=y
 
 # Needed for RPR tests due to huge amount of retransmitted messages
 CONFIG_BT_MESH_MSG_CACHE_SIZE=64
+
+CONFIG_MBEDTLS_PSA_KEY_SLOT_COUNT=64