diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 3eea53f6..12b014ad 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -34,7 +34,7 @@ jobs:
       - uses: actions-rs/toolchain@v1
         with:
           components: clippy
-          toolchain: nightly
+          toolchain: nightly-2021-09-30
           profile: minimal
           target: x86_64-unknown-linux-musl
           override: true
@@ -64,7 +64,7 @@ jobs:
       - uses: actions-rs/toolchain@v1
         with:
           components: clippy
-          toolchain: nightly
+          toolchain: nightly-2021-09-30
           profile: minimal
           target: x86_64-unknown-linux-musl
           override: true
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 05f5a67d..e84ecfc0 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -13,7 +13,7 @@ jobs:
       - uses: actions-rs/toolchain@v1
         with:
           target: x86_64-unknown-linux-musl
-          toolchain: nightly
+          toolchain: nightly-2021-09-30
           override: true
       - uses: actions-rs/cargo@v1
         with:
@@ -39,7 +39,7 @@ jobs:
       - uses: actions-rs/toolchain@v1
         with:
           target: x86_64-unknown-linux-musl
-          toolchain: nightly
+          toolchain: nightly-2021-09-30
           override: true
       - run: cargo test ${{ matrix.profile.flag }}
         working-directory: internal/${{ matrix.crate }}
diff --git a/build.rs b/build.rs
index 2a8d7fe0..eb7b3a2b 100644
--- a/build.rs
+++ b/build.rs
@@ -77,9 +77,7 @@ fn build_rs_tests(in_path: &Path, out_path: &Path) {
             .status()
             .unwrap_or_else(|_| panic!("failed to compile {:#?}", &in_source));
 
-        if !status.success() {
-            panic!("Failed to compile {:?}", &in_source);
-        }
+        assert!(status.success(), "Failed to compile {:?}", &in_source);
     }
 }
 
@@ -105,9 +103,7 @@ fn build_cc_tests(in_path: &Path, out_path: &Path) {
             .status()
             .unwrap_or_else(|_| panic!("failed to compile {:#?}", &in_source));
 
-        if !status.success() {
-            panic!("Failed to compile {:?}", &in_source);
-        }
+        assert!(status.success(), "Failed to compile {:?}", &in_source);
     }
 }
 
@@ -231,7 +227,7 @@ fn main() {
             .envs(&filtered_env)
             .stdout(stdout)
             .stderr(stderr)
-            .arg("+nightly")
+            .arg("+nightly-2021-09-30")
             .arg("build")
             .args(profile)
             .arg("--target-dir")