diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6ccff6e..1db808e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,6 +11,7 @@ env:
   RUSTFLAGS: "-Dwarnings"
   CARGO_INCREMENTAL: 0
   RUST_BACKTRACE: 1
+  CARGO_REGISTRIES_CRATES_IO_PROTOCOL: sparse
 
 jobs:
   set-msrv:
diff --git a/rust-toolchain b/rust-toolchain
index af92bdd..5deab58 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1 +1 @@
-1.63.0
+1.68.2