diff --git a/.github/workflows/benches.yml b/.github/workflows/benches.yml
index e317ba5..dc26f44 100644
--- a/.github/workflows/benches.yml
+++ b/.github/workflows/benches.yml
@@ -5,7 +5,6 @@ jobs:
     runs-on: ubuntu-latest
     env:
       RUSTFLAGS: "-D warnings"
-      CARGO_UNSTABLE_SPARSE_REGISTRY: true
     steps:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@nightly
diff --git a/.github/workflows/format.yml b/.github/workflows/format.yml
index b264fde..6d09821 100644
--- a/.github/workflows/format.yml
+++ b/.github/workflows/format.yml
@@ -3,8 +3,6 @@ name: Formatting on nightly toolchain
 jobs:
   format:
     runs-on: ubuntu-latest
-    env:
-      CARGO_UNSTABLE_SPARSE_REGISTRY: true
     steps:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@nightly
diff --git a/.github/workflows/fuzzing.yml b/.github/workflows/fuzzing.yml
index 85a49b9..e806622 100644
--- a/.github/workflows/fuzzing.yml
+++ b/.github/workflows/fuzzing.yml
@@ -5,7 +5,6 @@ jobs:
     runs-on: ubuntu-latest
     env:
       RUSTFLAGS: "-D warnings"
-      CARGO_UNSTABLE_SPARSE_REGISTRY: true
     steps:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@nightly
diff --git a/.github/workflows/lints.yml b/.github/workflows/lints.yml
index 86d4bd1..5165845 100644
--- a/.github/workflows/lints.yml
+++ b/.github/workflows/lints.yml
@@ -5,7 +5,6 @@ jobs:
     runs-on: ubuntu-latest
     env:
       RUSTFLAGS: "-D warnings"
-      CARGO_UNSTABLE_SPARSE_REGISTRY: true
     steps:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
diff --git a/.github/workflows/rustdoc.yml b/.github/workflows/rustdoc.yml
index ec0548f..35d82ef 100644
--- a/.github/workflows/rustdoc.yml
+++ b/.github/workflows/rustdoc.yml
@@ -5,7 +5,6 @@ jobs:
     runs-on: ubuntu-latest
     env:
       RUSTDOCFLAGS: "-D warnings"
-      CARGO_UNSTABLE_SPARSE_REGISTRY: true
     steps:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@nightly
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index ca4eadf..24ed2f7 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -16,7 +16,6 @@ jobs:
     runs-on: ${{ matrix.os }}
     env:
       RUSTFLAGS: "-D warnings"
-      CARGO_UNSTABLE_SPARSE_REGISTRY: true
     steps:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@master