diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 4cf51a0dba64..13785713f8aa 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -31,7 +31,7 @@ jobs:
     strategy:
       matrix:
         arch: [amd64]
-        rust: [nightly-2022-03-08]
+        rust: [nightly-2022-03-22]
     container:
       image: ${{ matrix.arch }}/rust
       env:
@@ -74,7 +74,7 @@ jobs:
     strategy:
       matrix:
         arch: [amd64]
-        rust: [nightly-2022-03-08]
+        rust: [nightly-2022-03-22]
     container:
       image: ${{ matrix.arch }}/rust
       env:
@@ -188,7 +188,7 @@ jobs:
     strategy:
       matrix:
         os: [windows-latest, macos-latest]
-        rust: [nightly-2022-03-08]
+        rust: [nightly-2022-03-22]
     steps:
       - uses: actions/checkout@v2
         with:
@@ -216,7 +216,7 @@ jobs:
     strategy:
       matrix:
         arch: [amd64]
-        rust: [nightly-2022-03-08]
+        rust: [nightly-2022-03-22]
     container:
       image: ${{ matrix.arch }}/rust
       env:
@@ -256,7 +256,7 @@ jobs:
     strategy:
       matrix:
         arch: [amd64]
-        rust: [nightly-2022-03-08]
+        rust: [nightly-2022-03-22]
     container:
       image: ${{ matrix.arch }}/rust
       env:
@@ -299,8 +299,8 @@ jobs:
       - uses: actions/checkout@v2
       - name: Setup toolchain
         run: |
-          rustup toolchain install nightly-2022-03-08
-          rustup default nightly-2022-03-08
+          rustup toolchain install nightly-2022-03-22
+          rustup default nightly-2022-03-22
           rustup component add rustfmt
       - name: Run
         run: cargo fmt --all -- --check
@@ -446,7 +446,7 @@ jobs:
     strategy:
       matrix:
         arch: [amd64]
-        rust: [nightly-2022-03-08]
+        rust: [nightly-2022-03-22]
     container:
       image: ${{ matrix.arch }}/rust
       env:
diff --git a/arrow/src/ipc/convert.rs b/arrow/src/ipc/convert.rs
index 97ed9ed78829..b9553847af2b 100644
--- a/arrow/src/ipc/convert.rs
+++ b/arrow/src/ipc/convert.rs
@@ -413,7 +413,7 @@ pub(crate) fn build_field<'a>(
 /// Get the IPC type of a data type
 pub(crate) fn get_fb_field_type<'a>(
     data_type: &DataType,
-    is_nullable: bool,
+    _is_nullable: bool,
     fbb: &mut FlatBufferBuilder<'a>,
 ) -> FBFieldType<'a> {
     // some IPC implementations expect an empty list for child data, instead of a null value.
@@ -653,7 +653,7 @@ pub(crate) fn get_fb_field_type<'a>(
             // In this library, the dictionary "type" is a logical construct. Here we
             // pass through to the value type, as we've already captured the index
             // type in the DictionaryEncoding metadata in the parent field
-            get_fb_field_type(value_type, is_nullable, fbb)
+            get_fb_field_type(value_type, _is_nullable, fbb)
         }
         Decimal(precision, scale) => {
             let mut builder = ipc::DecimalBuilder::new(fbb);
diff --git a/rust-toolchain b/rust-toolchain
index f367a50f005e..181ead84c689 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1 +1 @@
-nightly-2022-03-08
+nightly-2022-03-22