diff --git a/accountsdb-plugin-postgres/src/accountsdb_plugin_postgres.rs b/accountsdb-plugin-postgres/src/accountsdb_plugin_postgres.rs
index 8150f6fc2..950e8b7ed 100644
--- a/accountsdb-plugin-postgres/src/accountsdb_plugin_postgres.rs
+++ b/accountsdb-plugin-postgres/src/accountsdb_plugin_postgres.rs
@@ -17,6 +17,7 @@ use {
     thiserror::Error,
 };
 
+#[allow(clippy::large_enum_variant)]
 enum PostgresClientEnum {
     Simple(SimplePostgresClient),
     Parallel(ParallelPostgresClient),
diff --git a/ci/docker-rust-nightly/Dockerfile b/ci/docker-rust-nightly/Dockerfile
index 469ea91b6..48bec8e70 100644
--- a/ci/docker-rust-nightly/Dockerfile
+++ b/ci/docker-rust-nightly/Dockerfile
@@ -1,4 +1,4 @@
-FROM solanalabs/rust:1.55.0
+FROM solanalabs/rust:1.56.0
 ARG date
 
 RUN set -x \
diff --git a/ci/docker-rust/Dockerfile b/ci/docker-rust/Dockerfile
index ca82879cc..36c2f612d 100644
--- a/ci/docker-rust/Dockerfile
+++ b/ci/docker-rust/Dockerfile
@@ -1,6 +1,6 @@
 # Note: when the rust version is changed also modify
 # ci/rust-version.sh to pick up the new image tag
-FROM rust:1.55.0
+FROM rust:1.56.0
 
 # Add Google Protocol Buffers for Libra's metrics library.
 ENV PROTOC_VERSION 3.8.0
diff --git a/ci/rust-version.sh b/ci/rust-version.sh
index a0b22e78a..0d84b50f0 100644
--- a/ci/rust-version.sh
+++ b/ci/rust-version.sh
@@ -18,13 +18,13 @@
 if [[ -n $RUST_STABLE_VERSION ]]; then
   stable_version="$RUST_STABLE_VERSION"
 else
-  stable_version=1.55.0
+  stable_version=1.56.0
 fi
 
 if [[ -n $RUST_NIGHTLY_VERSION ]]; then
   nightly_version="$RUST_NIGHTLY_VERSION"
 else
-  nightly_version=2021-10-05
+  nightly_version=2021-10-22
 fi