diff --git a/cli/rust-toolchain.toml b/cli/rust-toolchain.toml
new file mode 100644
index 0000000..5198580
--- /dev/null
+++ b/cli/rust-toolchain.toml
@@ -0,0 +1,2 @@
+[toolchain]
+channel = "1.78.0"
diff --git a/program-test/rust-toolchain.toml b/program-test/rust-toolchain.toml
new file mode 100644
index 0000000..5198580
--- /dev/null
+++ b/program-test/rust-toolchain.toml
@@ -0,0 +1,2 @@
+[toolchain]
+channel = "1.78.0"