diff --git a/.github/workflows/o2-full-deps.yml b/.github/workflows/o2-full-deps.yml
index bbf00ea3..f0e1194f 100644
--- a/.github/workflows/o2-full-deps.yml
+++ b/.github/workflows/o2-full-deps.yml
@@ -27,16 +27,16 @@ jobs:
         include:
           - el_version: el7
             container: centos:7
-            alibuild_tag: v1.17.13
+            alibuild_tag: v1.17.15
           - el_version: el8
             container: almalinux:8
-            alibuild_tag: v1.17.13
+            alibuild_tag: v1.17.15
           - el_version: el9
             container: almalinux:9
-            alibuild_tag: v1.17.13
+            alibuild_tag: v1.17.15
           - el_version: fedora
             container: fedora:40
-            alibuild_tag: v1.17.13
+            alibuild_tag: v1.17.15
 
     name: "RPM (${{ matrix.el_version }})"
     container: ${{ matrix.container }}
@@ -103,7 +103,7 @@ jobs:
     name: DEB (${{ matrix.ubuntu_codename }})
     container: ubuntu:${{ matrix.ubuntu_codename }}
     env:
-      ALIBUILD_TAG: v1.17.13
+      ALIBUILD_TAG: v1.17.15
       ALIBUILD_DISTRO: ${{ matrix.ubuntu_codename }}
       DEBIAN_FRONTEND: noninteractive
     steps:
diff --git a/ci/repo-config/mesosci/slc9-gpu/DEFAULTS.env b/ci/repo-config/mesosci/slc9-gpu/DEFAULTS.env
new file mode 100644
index 00000000..ba53f96b
--- /dev/null
+++ b/ci/repo-config/mesosci/slc9-gpu/DEFAULTS.env
@@ -0,0 +1 @@
+INSTALL_ALIBUILD='alisw/alibuild@v1.17.15#egg=alibuild'