diff --git a/rust b/rust
index 06d846f..4d71257 160000
--- a/rust
+++ b/rust
@@ -1 +1 @@
-Subproject commit 06d846fac241136294e945d5c2a7e482d37a1e64
+Subproject commit 4d71257ed5786bea5d04432fda5d3090eb7f9f58
diff --git a/rust-toolchain b/rust-toolchain
index 4888794..1b56464 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1 +1 @@
-nightly-2018-11-07
+nightly-2019-04-06