diff --git a/.github/workflows/miri.yaml b/.github/workflows/miri.yaml
index b74170ff2537..36ac0a3717cb 100644
--- a/.github/workflows/miri.yaml
+++ b/.github/workflows/miri.yaml
@@ -30,7 +30,7 @@ jobs:
     strategy:
       matrix:
         arch: [amd64]
-        rust: [nightly-2021-03-24]
+        rust: [nightly-2021-07-04]
     steps:
       - uses: actions/checkout@v2
         with:
diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index a041afc8b217..ea561b16e68c 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -126,7 +126,7 @@ jobs:
     strategy:
       matrix:
         arch: [amd64]
-        rust: [nightly-2021-03-24]
+        rust: [nightly-2021-07-04]
     container:
       image: ${{ matrix.arch }}/rust
       env:
@@ -290,7 +290,7 @@ jobs:
     strategy:
       matrix:
         arch: [amd64]
-        rust: [nightly-2021-03-24]
+        rust: [nightly-2021-07-04]
     container:
       image: ${{ matrix.arch }}/rust
       env:
diff --git a/arrow/Cargo.toml b/arrow/Cargo.toml
index 4a1016aab026..9875262c31bc 100644
--- a/arrow/Cargo.toml
+++ b/arrow/Cargo.toml
@@ -45,7 +45,7 @@ num = "0.4"
 csv_crate = { version = "1.1", optional = true, package="csv" }
 regex = "1.3"
 lazy_static = "1.4"
-packed_simd = { version = "0.3.4", optional = true, package = "packed_simd_2" }
+packed_simd = { version = "0.3", optional = true, package = "packed_simd_2" }
 chrono = "0.4"
 flatbuffers = { version = "=2.0.0", optional = true }
 hex = "0.4"