diff --git a/.gitea/workflows/cicd-checks.yaml b/.gitea/workflows/cicd-checks.yaml
index 721ed7b..4cae7d3 100644
--- a/.gitea/workflows/cicd-checks.yaml
+++ b/.gitea/workflows/cicd-checks.yaml
@@ -65,8 +65,8 @@ jobs:
 
   run-check:
     name: ${{ matrix.name }}
-    # Docker-capable runner required: pulls and runs the CICD container image.
-    runs-on: ubuntu-act
+    # Docker-capable 8GB runner required for stable container startup.
+    runs-on: ubuntu-act-8gb
     timeout-minutes: 20
     needs: setup
     strategy:
diff --git a/.gitea/workflows/cicd-tests.yaml b/.gitea/workflows/cicd-tests.yaml
index d799f4b..5a9da70 100644
--- a/.gitea/workflows/cicd-tests.yaml
+++ b/.gitea/workflows/cicd-tests.yaml
@@ -65,8 +65,8 @@ jobs:
 
   backend-tests:
     name: Backend Tests
-    # Docker-capable runner required: pulls and runs the CICD container image.
-    runs-on: ubuntu-act
+    # Docker-capable 8GB runner required for stable container startup.
+    runs-on: ubuntu-act-8gb
     timeout-minutes: 25
     needs: setup
     steps:
@@ -119,8 +119,8 @@ jobs:
 
   frontend-tests:
     name: Frontend Tests
-    # Docker-capable runner required: pulls and runs the CICD container image.
-    runs-on: ubuntu-act
+    # Docker-capable 8GB runner required for stable container startup.
+    runs-on: ubuntu-act-8gb
     timeout-minutes: 25
     needs: setup
     steps:
@@ -137,8 +137,8 @@ jobs:
 
   xdoctest:
     name: Backend Doctests
-    # Docker-capable runner required: pulls and runs the CICD container image.
-    runs-on: ubuntu-act
+    # Docker-capable 8GB runner required for stable container startup.
+    runs-on: ubuntu-act-8gb
     timeout-minutes: 15
     needs: setup
     steps:
@@ -156,8 +156,8 @@ jobs:
 
   integration-tests:
     name: Integration Tests
-    # Docker-capable runner required: pulls and runs the CICD container image.
-    runs-on: ubuntu-act
+    # Docker-capable 8GB runner required for stable container startup.
+    runs-on: ubuntu-act-8gb
     timeout-minutes: 20
     needs: [setup, backend-tests]
     steps:
@@ -179,8 +179,8 @@ jobs:
 
   e2e-tests:
     name: End-to-End Tests
-    # Docker-capable runner required: pulls and runs the CICD container image.
-    runs-on: ubuntu-act
+    # Docker-capable 8GB runner required for stable container startup.
+    runs-on: ubuntu-act-8gb
     timeout-minutes: 30
     needs: [setup, frontend-tests]
     steps: