diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index eb3558e14cb..f853d5c454f 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -299,8 +299,8 @@ jobs:
           key: ${{ runner.os }}-amd64-target-simd-cache-
       - name: Setup toolchain
         run: |
-          rustup toolchain install nightly
-          rustup default nightly
+          rustup toolchain install nightly-2021-08-30
+          rustup default nightly-2021-08-30
       - name: Run
         run: |
           export CARGO_HOME="/github/home/.cargo"
diff --git a/Cargo.toml b/Cargo.toml
index 8184ebf2be8..d9abdea1c3a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -48,7 +48,7 @@ itertools = { version = "^0.10", optional = true }
 
 base64 = { version = "0.13.0", optional = true }
 
-packed_simd = { version = "0.3.4", optional = true, package = "packed_simd_2" }
+packed_simd = { version = "0.3", optional = true, package = "packed_simd_2" }
 
 # to write to parquet as a stream
 futures = { version = "0.3", optional = true }