diff --git a/pleco/Cargo.toml b/pleco/Cargo.toml
index 41c20bb..abd34de 100644
--- a/pleco/Cargo.toml
+++ b/pleco/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "pleco"
-version = "0.3.11"
+version = "0.4.0"
 authors = ["Stephen Fleischman <stephenf@cs.washington.edu>"]
 description = "A blazingly-fast chess library."
 homepage = "https://github.com/sfleischman105/Pleco"
diff --git a/pleco_engine/Cargo.toml b/pleco_engine/Cargo.toml
index 3c0d909..ae631e1 100644
--- a/pleco_engine/Cargo.toml
+++ b/pleco_engine/Cargo.toml
@@ -67,7 +67,7 @@ path = "src/lib.rs"
 doctest = true
 
 [dependencies]
-pleco = { path = "../pleco", version = "0.3.11" }
+pleco = { path = "../pleco", version = "0.4.0" }
 clippy = {version = "0.0.191", optional = true}
 chrono = "0.4.1"
 rand = "0.4.2"