diff --git a/Cargo.toml b/Cargo.toml
index 2288b5f..9301cf9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -43,7 +43,7 @@ macros = ["mlua_derive/macros"]
 [dependencies]
 mlua_derive = { version = "=0.6.0", optional = true, path = "mlua_derive" }
 bstr = { version = "0.2", features = ["std"], default_features = false }
-once_cell = { version = "1.7" }
+once_cell = { version = "1.0" }
 num-traits = { version = "0.2.14" }
 futures-core = { version = "0.3.5", optional = true }
 futures-task = { version = "0.3.5", optional = true }