diff --git a/core/Cargo.toml b/core/Cargo.toml
index 1b5e9c8f..09778be2 100644
--- a/core/Cargo.toml
+++ b/core/Cargo.toml
@@ -11,7 +11,7 @@ edition = "2018"
 
 [dependencies]
 cfg-if = "1.0.0"
-smallvec = "1.4.0"
+smallvec = "1.0"
 petgraph = { version = "0.5.1", optional = true }
 thread-id = { version = "3.3.0", optional = true }
 backtrace = { version = "0.3.49", optional = true }