diff --git a/.gitea/workflows/cli-level1-tests.yml b/.gitea/workflows/cli-level1-tests.yml
index ebbe6497..9e2554d1 100644
--- a/.gitea/workflows/cli-level1-tests.yml
+++ b/.gitea/workflows/cli-level1-tests.yml
@@ -15,6 +15,11 @@ on:
     - cron: '0 6 * * *'  # Daily at 6 AM UTC
   workflow_dispatch:
 
+# Prevent parallel execution - run workflows serially
+concurrency:
+  group: ci-workflows
+  cancel-in-progress: true
+
 jobs:
   test-cli-level1:
     runs-on: debian 
diff --git a/.gitea/workflows/package-tests.yml b/.gitea/workflows/package-tests.yml
index c0712873..7fcd047b 100644
--- a/.gitea/workflows/package-tests.yml
+++ b/.gitea/workflows/package-tests.yml
@@ -13,6 +13,11 @@ on:
       - '.gitea/workflows/package-tests.yml'
   workflow_dispatch:
 
+# Prevent parallel execution - run workflows serially
+concurrency:
+  group: ci-workflows
+  cancel-in-progress: true
+
 jobs:
   test-python-packages:
     runs-on: debian
diff --git a/.gitea/workflows/python-tests.yml b/.gitea/workflows/python-tests.yml
index bebeef32..4b989ed4 100644
--- a/.gitea/workflows/python-tests.yml
+++ b/.gitea/workflows/python-tests.yml
@@ -3,10 +3,24 @@ name: python-tests
 on:
   push:
     branches: [ main, develop ]
+    paths:
+      - 'apps/blockchain-node/**'
+      - 'apps/coordinator-api/**'
+      - 'packages/py/**'
+      - '.gitea/workflows/python-tests.yml'
   pull_request:
     branches: [ main, develop ]
+    paths:
+      - 'apps/blockchain-node/**'
+      - 'apps/coordinator-api/**'
+      - 'packages/py/**'
+      - '.gitea/workflows/python-tests.yml'
   workflow_dispatch:
 
+concurrency:
+  group: ci-workflows
+  cancel-in-progress: true
+
 jobs:
   test:
     runs-on: debian
diff --git a/.gitea/workflows/security-scanning.yml b/.gitea/workflows/security-scanning.yml
index f5284f40..ff9890d4 100644
--- a/.gitea/workflows/security-scanning.yml
+++ b/.gitea/workflows/security-scanning.yml
@@ -2,8 +2,16 @@ name: security-scanning
 
 on:
   push:
+    branches: [ main, develop ]
+  pull_request:
+    branches: [ main, develop ]
   workflow_dispatch:
 
+# Prevent parallel execution - run workflows serially
+concurrency:
+  group: ci-workflows
+  cancel-in-progress: true
+
 jobs:
   audit:
     runs-on: debian
diff --git a/.gitea/workflows/smart-contract-tests.yml b/.gitea/workflows/smart-contract-tests.yml
index b00d043a..7e504cff 100644
--- a/.gitea/workflows/smart-contract-tests.yml
+++ b/.gitea/workflows/smart-contract-tests.yml
@@ -15,6 +15,11 @@ on:
       - '.gitea/workflows/smart-contract-tests.yml'
   workflow_dispatch:
 
+# Prevent parallel execution - run workflows serially
+concurrency:
+  group: ci-workflows
+  cancel-in-progress: true
+
 jobs:
   test-solidity-contracts:
     runs-on: debian