diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index 221f368..9f9d061 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -6,6 +6,12 @@ on:
       - main
   pull_request:
 
+# Only one pull-request triggered run should be executed at a time
+# (head_ref is only set for PR events, otherwise fallback to run_id which differs for every run).
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
 jobs:
   # completely stolen from https://github.com/jonhoo/inferno/blob/8c0a28cab440fd00cd42cfbca403dde895cc67e3/.github/workflows/check.yml#L86-L107
   msrv:
@@ -34,7 +40,7 @@ jobs:
         with:
           profile: minimal
           toolchain: ${{matrix.msrv}}
-          defualt: true
+          default: true
           components: rustfmt, clippy
 
       - name: cargo +${{ matrix.msrv }} check
diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
index 3c36e35..3cf7d04 100644
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -7,6 +7,12 @@ on:
   pull_request:
   workflow_dispatch:
 
+# Only one pull-request triggered run should be executed at a time
+# (head_ref is only set for PR events, otherwise fallback to run_id which differs for every run).
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
 jobs:
   coverage:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
deleted file mode 100644
index 354cc26..0000000
--- a/.github/workflows/release.yml
+++ /dev/null
@@ -1,45 +0,0 @@
-name: Open a release PR
-on:
-  workflow_dispatch:
-    inputs:
-      crate:
-        description: Crate to release
-        required: true
-        type: choice
-        options:
-          - fitsio
-          - fitsio-sys
-          - fitsio-derive
-      version:
-        description: Version to release
-        required: true
-        type: string
-
-jobs:
-  make-release-pr:
-    permissions:
-      id-token: write
-      pull-requests: write
-      contents: write
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - uses: chainguard-dev/actions/setup-gitsign@main
-      - name: Install cargo-release
-        uses: taiki-e/install-action@v2
-        with:
-          tool: cargo-release
-      - name: Install ubuntu dependencies
-        run: |
-          sudo apt-get update && sudo apt-get install --no-install-recommends -y \
-            llvm-dev \
-            libcfitsio-dev \
-            pkg-config \
-            libssl-dev \
-            python3
-      - uses: cargo-bins/release-pr@v2
-        with:
-          github-token: ${{ secrets.PIPELINE_TOKEN }}
-          version: ${{ inputs.version }}
-          crate-name: ${{ inputs.crate }}
-          pr-merge-strategy: merge
diff --git a/.github/workflows/schedule.yml b/.github/workflows/schedule.yml
index 9eb8ab3..deea131 100644
--- a/.github/workflows/schedule.yml
+++ b/.github/workflows/schedule.yml
@@ -8,6 +8,12 @@ on:
   schedule:
     - cron: "7 7 * * *"
 
+# Only one pull-request triggered run should be executed at a time
+# (head_ref is only set for PR events, otherwise fallback to run_id which differs for every run).
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
 jobs:
   nightly:
     runs-on: ubuntu-latest
@@ -33,4 +39,4 @@ jobs:
           components: rustfmt, clippy
 
       - name: Test the code
-        run: python3 ./bin/test --rust-version nightly --test all --extra-clippy-flags "-A clippy::arc_with_non_send_sync"  # extra clippy args since lint is nightly only for now
+        run: python3 ./bin/test --rust-version nightly --test all --extra-clippy-flags "-A clippy::arc_with_non_send_sync" # extra clippy args since lint is nightly only for now
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index c3f2c12..d33970e 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -6,6 +6,12 @@ on:
       - main
   pull_request:
 
+# Only one pull-request triggered run should be executed at a time
+# (head_ref is only set for PR events, otherwise fallback to run_id which differs for every run).
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
 jobs:
   ci-test:
     runs-on: ubuntu-latest