diff --git a/.github/workflows/build-test-and-sonar.yml b/.github/workflows/build-test-and-sonar.yml
index a1ee447b..bb51ee24 100644
--- a/.github/workflows/build-test-and-sonar.yml
+++ b/.github/workflows/build-test-and-sonar.yml
@@ -22,6 +22,10 @@ on:
         default: true
         required: true
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
 
   build-python:
@@ -94,6 +98,9 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
         python: ["3.9", "3.10", "3.11", "3.12"]
+        exclude:
+          - os: macos-latest
+            python: "3.9"
       fail-fast: false
     runs-on: ${{ matrix.os }}
 
@@ -125,6 +132,9 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
         python: ["3.9", "3.10", "3.11", "3.12"]
+        exclude:
+          - os: macos-latest
+            python: "3.9"
       fail-fast: false
     runs-on: ${{ matrix.os }}
 
diff --git a/.github/workflows/check-blocking-labels.yml b/.github/workflows/check-blocking-labels.yml
index 10fe7fe3..b571c092 100644
--- a/.github/workflows/check-blocking-labels.yml
+++ b/.github/workflows/check-blocking-labels.yml
@@ -18,6 +18,10 @@ on:
   # run this workflow manually from the Actions tab
   workflow_dispatch:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   check-blocking-labels:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/check-code-quality.yml b/.github/workflows/check-code-quality.yml
index f42ddc97..c0f3c04e 100644
--- a/.github/workflows/check-code-quality.yml
+++ b/.github/workflows/check-code-quality.yml
@@ -14,6 +14,10 @@ on:
   # run pipeline on merge queue
   merge_group:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   check-code-quality:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/citations.yml b/.github/workflows/citations.yml
index c78e3308..269d7d94 100644
--- a/.github/workflows/citations.yml
+++ b/.github/workflows/citations.yml
@@ -11,9 +11,19 @@ on:
       - main
     paths:
       - CITATION.cff
+      - .github/workflows/citations.yml
+
+  pull_request:
+    paths:
+      - CITATION.cff
+      - .github/workflows/citations.yml
 
   workflow_dispatch:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   validate-citations:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/reuse-compliance.yml b/.github/workflows/reuse-compliance.yml
index 57520d2e..c112330f 100644
--- a/.github/workflows/reuse-compliance.yml
+++ b/.github/workflows/reuse-compliance.yml
@@ -14,6 +14,10 @@ on:
   # run pipeline on merge queue
   merge_group:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   reuse-compliance-check:
     runs-on: ubuntu-latest