diff --git a/checksum/mdbx-0.3.0.gem.sha512 b/checksum/mdbx-0.3.0.gem.sha512
new file mode 100644
index 0000000..7b75354
--- /dev/null
+++ b/checksum/mdbx-0.3.0.gem.sha512
@@ -0,0 +1 @@
+140aecd4ce4b6c0172ae474339e912a1038cd74400bc5664921a17c3fbb2d1844d36ba8d77f74c00c71a0259195befdc551a50d65a4dd5bebb459dea5a3963c3
\ No newline at end of file