diff --git a/.github/workflows/testpr.yml b/.github/workflows/testpr.yml
index a6c7600f8..f1e345fc7 100644
--- a/.github/workflows/testpr.yml
+++ b/.github/workflows/testpr.yml
@@ -191,7 +191,7 @@ jobs:
           EXTRA_BUILD_ARGS="--no-build-id"
         fi
         # --channel-priority disabled: resolvo would otherwise refuse a just-built local package once any other-channel build of the same name exists.
-        pixi run rattler-build build --recipe-dir recipes --target-platform ${{ matrix.platform }} -m ./conda_build_config.yaml -c conda-forge -c robostack-rolling --skip-existing --channel-priority disabled $EXTRA_BUILD_ARGS 2>&1 | tee rattler-build.log
+        pixi run rattler-build build --recipe-dir recipes --target-platform ${{ matrix.platform }} -m ./conda_build_config.yaml -c https://prefix.dev/conda-forge -c https://prefix.dev/robostack-rolling --skip-existing --channel-priority disabled $EXTRA_BUILD_ARGS 2>&1 | tee rattler-build.log
         build_status=${PIPESTATUS[0]}
         echo "exit-code=${build_status}" >> "$GITHUB_OUTPUT"
         exit "$build_status"
diff --git a/conda_build_config.yaml b/conda_build_config.yaml
index bb40c2561..6926ee5f1 100644
--- a/conda_build_config.yaml
+++ b/conda_build_config.yaml
@@ -819,8 +819,6 @@ lol_html:
   - 3.0.1
 ls_hpack:
   - 2.3.5
-lua:
-  - 5.4
 lwtnn:
   - '2.14'
 lz4_c:
@@ -1013,7 +1011,12 @@ qt:
 qt_main:
   - 5.15
 qt6_main:
-  - '6'
+  - 6.11
+  # conda-forge published sip 6.16.1 on 2026-09-08, which broke ABI targeting for
+  # packages like qt_gui_cpp_sip that build against PyQt-sip's fixed ABI v12
+  # (hit this on humble/jazzy first; rolling also builds qt_gui_cpp via
+  # pyqt6/sip so it's equally exposed). Pin back to the last known-good line
+  # until upstream fixes it.
 qtkeychain:
   - '0.17'
 rav1e:
@@ -1173,10 +1176,14 @@ libzenohc:
   - 1.10.1
 libzenohcxx:
   - 1.10.1
-  # conda-forge published sip 6.16.1 on 2026-09-08, which broke ABI targeting for
-  # packages like qt_gui_cpp_sip that build against PyQt-sip's fixed ABI v12
-  # (hit this on humble/jazzy first; rolling also builds qt_gui_cpp via
-  # pyqt6/sip so it's equally exposed). Pin back to the last known-good line
-  # until upstream fixes it.
+  # cartographer was built with lua 5.4.8, otherwise it pulls in 5.5 which leads to conflicts
+lua:
+  - 5.4
+  # conda-forge's newest pyqt6 (6.11.0) still requires qt6-main <6.12, so
+  # packages built against the newly released qt6-main 6.12 can't be installed
+  # together with python_qt_binding (pyqt6). Pin both to 6.11 until pyqt6 is
+  # rebuilt for qt6-main 6.12.
+pyqt6:
+  - 6.11
 sip:
   - 6.15
diff --git a/pkg_additional_info.yaml b/pkg_additional_info.yaml
index 6f03454ba..fa8738510 100644
--- a/pkg_additional_info.yaml
+++ b/pkg_additional_info.yaml
@@ -46,8 +46,6 @@ gz_dartsim_vendor:
   additional_cmake_args: "-DAMENT_VENDOR_POLICY=NEVER_VENDOR_IGNORE_SATISFIED_CHECK"
 gz_fuel_tools_vendor:
   additional_cmake_args: "-DAMENT_VENDOR_POLICY=NEVER_VENDOR_IGNORE_SATISFIED_CHECK"
-gz_gui_vendor:
-  additional_cmake_args: "-DAMENT_VENDOR_POLICY=NEVER_VENDOR_IGNORE_SATISFIED_CHECK"
 gz_math_vendor:
   additional_cmake_args: "-DAMENT_VENDOR_POLICY=NEVER_VENDOR_IGNORE_SATISFIED_CHECK"
 gz_msgs_vendor:
@@ -64,8 +62,6 @@ gz_ros2_control:
   additional_cmake_args: "-DCMAKE_WINDOWS_EXPORT_ALL_SYMBOLS=ON"
 gz_sensors_vendor:
   additional_cmake_args: "-DAMENT_VENDOR_POLICY=NEVER_VENDOR_IGNORE_SATISFIED_CHECK"
-gz_sim_vendor:
-  additional_cmake_args: "-DAMENT_VENDOR_POLICY=NEVER_VENDOR_IGNORE_SATISFIED_CHECK"
 gz_transport_vendor:
   additional_cmake_args: "-DAMENT_VENDOR_POLICY=NEVER_VENDOR_IGNORE_SATISFIED_CHECK"
 gz_utils_vendor:
@@ -198,3 +194,44 @@ visp:
     override_version: '3.7.0'
 zenoh_cpp_vendor:
   additional_cmake_args: "-DAMENT_VENDOR_POLICY=NEVER_VENDOR_IGNORE_SATISFIED_CHECK -DUSE_SYSTEM_ZENOH=ON"
+gz_gui_vendor:
+  additional_cmake_args: "-DAMENT_VENDOR_POLICY=NEVER_VENDOR_IGNORE_SATISFIED_CHECK"
+  # Rebuild with qt6-main 6.11 (b29 was built against qt6-main 6.12, which pyqt6 6.11 can't install with).
+  build_number: 30
+gz_sim_vendor:
+  additional_cmake_args: "-DAMENT_VENDOR_POLICY=NEVER_VENDOR_IGNORE_SATISFIED_CHECK"
+  # Rebuild with qt6-main 6.11 (b29 was built against qt6-main 6.12, which pyqt6 6.11 can't install with).
+  build_number: 30
+rqt_plot:
+  # Rebuild with qt6-main 6.11 (b29 was built against qt6-main 6.12, which pyqt6 6.11 can't install with).
+  build_number: 30
+rqt_py_common:
+  # Rebuild with qt6-main 6.11 (b29 was built against qt6-main 6.12, which pyqt6 6.11 can't install with).
+  build_number: 30
+rviz2:
+  # Rebuild with qt6-main 6.11 (b29 was built against qt6-main 6.12, which pyqt6 6.11 can't install with).
+  build_number: 30
+rviz_common:
+  # Rebuild with qt6-main 6.11 (b29 was built against qt6-main 6.12, which pyqt6 6.11 can't install with).
+  build_number: 30
+rviz_default_plugins:
+  # Rebuild with qt6-main 6.11 (b29 was built against qt6-main 6.12, which pyqt6 6.11 can't install with).
+  build_number: 30
+rviz_imu_plugin:
+  # Rebuild with qt6-main 6.11 (b29 was built against qt6-main 6.12, which pyqt6 6.11 can't install with).
+  build_number: 30
+rviz_rendering:
+  # Rebuild with qt6-main 6.11 (b29 was built against qt6-main 6.12, which pyqt6 6.11 can't install with).
+  build_number: 30
+rviz_rendering_tests:
+  # Rebuild with qt6-main 6.11 (b29 was built against qt6-main 6.12, which pyqt6 6.11 can't install with).
+  build_number: 30
+rviz_satellite:
+  # Rebuild with qt6-main 6.11 (b29 was built against qt6-main 6.12, which pyqt6 6.11 can't install with).
+  build_number: 30
+rviz_visual_testing_framework:
+  # Rebuild with qt6-main 6.11 (b29 was built against qt6-main 6.12, which pyqt6 6.11 can't install with).
+  build_number: 30
+turtlesim:
+  # Rebuild with qt6-main 6.11 (b29 was built against qt6-main 6.12, which pyqt6 6.11 can't install with).
+  build_number: 30
diff --git a/vinca_pinning.yaml b/vinca_pinning.yaml
index 192dd4e34..67c4a9396 100644
--- a/vinca_pinning.yaml
+++ b/vinca_pinning.yaml
@@ -46,6 +46,14 @@ pinning_overrides:
   # cartographer was built with lua 5.4.8, otherwise it pulls in 5.5 which leads to conflicts
   lua:
     - 5.4
+  # conda-forge's newest pyqt6 (6.11.0) still requires qt6-main <6.12, so
+  # packages built against the newly released qt6-main 6.12 can't be installed
+  # together with python_qt_binding (pyqt6). Pin both to 6.11 until pyqt6 is
+  # rebuilt for qt6-main 6.12.
+  pyqt6:
+    - 6.11
+  qt6_main:
+    - 6.11
   # conda-forge published sip 6.16.1 on 2026-09-08, which broke ABI targeting for
   # packages like qt_gui_cpp_sip that build against PyQt-sip's fixed ABI v12
   # (hit this on humble/jazzy first; rolling also builds qt_gui_cpp via