diff --git a/pyproject.toml b/pyproject.toml
index 24012413..46adc715 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -81,7 +81,7 @@ optional-dependencies.solana = [
 ]
 optional-dependencies.substrate = [
   "py-sr25519-bindings",
-  "substrate-interface",
+  "substrate-interface<1.8",
 ]
 optional-dependencies.tezos = [
   "pytezos-crypto==3.13.4.1",