diff --git a/.github/workflows/ubuntu-packages-and-docker-image.yml b/.github/workflows/ubuntu-packages-and-docker-image.yml
index c77ba497d..8a78bd7ce 100644
--- a/.github/workflows/ubuntu-packages-and-docker-image.yml
+++ b/.github/workflows/ubuntu-packages-and-docker-image.yml
@@ -5,13 +5,20 @@ on:
     inputs:
       packageVersion:
         default: "2.10.0"
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+      
 jobs:
   #
   # PostgresML extension.
   #
   postgresml-pgml:
+    needs: postgresml-dashboard # REMOVE: testing serialization
     strategy:
       fail-fast: false # Let the other job finish
+      max-parallel: 1  # Only one job at a time from this matrix
       matrix:
         include:
           # Ubuntu 24.04 LTS (Noble)
@@ -108,10 +115,11 @@ jobs:
           ruby \
           lld
 
-        curl -sLO https://github.com/deb-s3/deb-s3/releases/download/0.11.4/deb-s3-0.11.4.gem
-        sudo gem install deb-s3-0.11.4.gem
+        curl -sLO https://github.com/deb-s3/deb-s3/releases/download/0.11.8/deb-s3-0.11.8.gem
+        sudo gem install deb-s3-0.11.8.gem
         sudo dpkg --configure -a
         dpkg-deb --version
+        
     - name: Install pgrx
       uses: postgresml/gh-actions-cargo@master
       with:
@@ -212,15 +220,16 @@ jobs:
   postgresml-dashboard:
     strategy:
       fail-fast: false
+      max-parallel: 1  # Only one job at a time from this matrix
       matrix:
         include:
           # Ubuntu 24.04 LTS (Noble)
-          - os: "ubuntu-24.04"
-            ubuntu_version: "noble"
-            arch: "amd64"
-          - os: "ubuntu-24.04-arm"
-            ubuntu_version: "noble"
-            arch: "arm64"
+          # - os: "ubuntu-24.04"
+          #  ubuntu_version: "noble"
+          #  arch: "amd64"
+          # - os: "ubuntu-24.04-arm"
+          #  ubuntu_version: "noble"
+          #  arch: "arm64"
           # Ubuntu 22.04 LTS (Jammy)
           - os: "ubuntu-22.04"
             ubuntu_version: "jammy"
@@ -236,8 +245,8 @@ jobs:
         toolchain: stable
     - name: Update dependencies
       run: |
-        curl -sLO https://github.com/deb-s3/deb-s3/releases/download/0.11.4/deb-s3-0.11.4.gem
-        sudo gem install deb-s3-0.11.4.gem
+        curl -sLO https://github.com/deb-s3/deb-s3/releases/download/0.11.8/deb-s3-0.11.8.gem
+        sudo gem install deb-s3-0.11.8.gem
         sudo dpkg --configure -a
         dpkg-deb --version
     - name: Build and release package