diff --git a/.github/workflows/netbench.yml b/.github/workflows/netbench.yml
index 28d43926be..b76cdf96b4 100644
--- a/.github/workflows/netbench.yml
+++ b/.github/workflows/netbench.yml
@@ -80,7 +80,7 @@ jobs:
       - uses: actions-rs/toolchain@v1.0.7
         id: toolchain
         with:
-          toolchain: 1.63.0
+          toolchain: 1.64.0
           override: true
 
       - uses: camshaft/rust-cache@v1
@@ -112,7 +112,7 @@ jobs:
       - uses: actions-rs/toolchain@v1.0.7
         id: toolchain
         with:
-          toolchain: 1.63.0
+          toolchain: 1.64.0
           override: true
 
       - uses: camshaft/rust-cache@v1
diff --git a/netbench/rust-toolchain b/netbench/rust-toolchain
index af92bdd9f5..9405730420 100644
--- a/netbench/rust-toolchain
+++ b/netbench/rust-toolchain
@@ -1 +1 @@
-1.63.0
+1.64.0
diff --git a/quic/s2n-quic-sim/Cargo.toml b/quic/s2n-quic-sim/Cargo.toml
index 7fdcbb1fde..ded768794c 100644
--- a/quic/s2n-quic-sim/Cargo.toml
+++ b/quic/s2n-quic-sim/Cargo.toml
@@ -27,3 +27,6 @@ structopt = "0.3"
 toml = "0.7"
 tracing = "0.1"
 tracing-subscriber = { version = "0.3", features = ["env-filter"] }
+# >0.4.1 breaks compatibility with 1.63
+# See https://github.com/aws/s2n-quic/issues/1735
+winnow = "=0.4.1"