diff --git a/ci/build_cpp.sh b/ci/build_cpp.sh
index cb6d61b5e..d16225dcb 100755
--- a/ci/build_cpp.sh
+++ b/ci/build_cpp.sh
@@ -22,6 +22,7 @@ RAPIDS_PACKAGE_VERSION=$(rapids-generate-version)
 export RAPIDS_PACKAGE_VERSION
 
 # populates `RATTLER_CHANNELS` array and `RATTLER_ARGS` array
+source ./ci/use_conda_packages_from_prs.sh
 source rapids-rattler-channel-string
 
 
diff --git a/ci/build_docs.sh b/ci/build_docs.sh
index c9fc8a5fe..5607103e9 100755
--- a/ci/build_docs.sh
+++ b/ci/build_docs.sh
@@ -20,6 +20,7 @@ rapids-logger "Downloading artifacts from previous jobs"
 CPP_CHANNEL=$(rapids-download-from-github "$(rapids-artifact-name conda_cpp libcuopt cuopt --cuda "$RAPIDS_CUDA_VERSION")")
 PYTHON_CHANNEL=$(rapids-download-from-github "$(rapids-artifact-name conda_python cuopt cuopt --py "$RAPIDS_PY_VERSION" --cuda "$RAPIDS_CUDA_VERSION")")
 
+source ./ci/use_conda_packages_from_prs.sh
 rapids-logger "Generating conda environment YAML"
 
 rapids-dependency-file-generator \
diff --git a/ci/build_python.sh b/ci/build_python.sh
index 4595e3a82..4f402b58a 100755
--- a/ci/build_python.sh
+++ b/ci/build_python.sh
@@ -27,6 +27,7 @@ for package_name in cuopt cuopt_server; do
 done
 
 # populates `RATTLER_CHANNELS` array and `RATTLER_ARGS` array
+source ./ci/use_conda_packages_from_prs.sh
 source rapids-rattler-channel-string
 
 # Override `rapids-rattler-channelstring` while cuOpt is not on the standard RAPIDS release cycle
diff --git a/ci/build_wheel_cuopt.sh b/ci/build_wheel_cuopt.sh
index f624b2770..5cac4e520 100755
--- a/ci/build_wheel_cuopt.sh
+++ b/ci/build_wheel_cuopt.sh
@@ -29,6 +29,7 @@ RAPIDS_PY_CUDA_SUFFIX="$(rapids-wheel-ctk-name-gen "${RAPIDS_CUDA_VERSION}")"
 RAPIDS_PY_CUDA_SUFFIX="$(rapids-wheel-ctk-name-gen "${RAPIDS_CUDA_VERSION}")"
 LIBCUOPT_WHEELHOUSE=$(rapids-download-from-github "$(rapids-artifact-name wheel_cpp libcuopt cuopt --cuda "$RAPIDS_CUDA_VERSION")")
 
+source ./ci/use_wheels_from_prs.sh
 echo "libcuopt-${RAPIDS_PY_CUDA_SUFFIX} @ file://$(echo ${LIBCUOPT_WHEELHOUSE}/libcuopt_*.whl)" >> "${PIP_CONSTRAINT}"
 
 EXCLUDE_ARGS=(
diff --git a/ci/build_wheel_libcuopt.sh b/ci/build_wheel_libcuopt.sh
index faa28c147..5a958d3fa 100755
--- a/ci/build_wheel_libcuopt.sh
+++ b/ci/build_wheel_libcuopt.sh
@@ -65,6 +65,8 @@ rapids-dependency-file-generator \
   --matrix "cuda=${RAPIDS_CUDA_VERSION%.*};arch=$(arch);py=${RAPIDS_PY_VERSION};cuda_suffixed=true" \
 | tee /tmp/requirements-build.txt
 
+source ./ci/use_wheels_from_prs.sh
+
 rapids-logger "Installing build requirements"
 rapids-pip-retry install \
     -v \
diff --git a/ci/test_cpp.sh b/ci/test_cpp.sh
index f824aabea..780cbedf5 100755
--- a/ci/test_cpp.sh
+++ b/ci/test_cpp.sh
@@ -11,11 +11,15 @@ rapids-logger "Configuring conda strict channel priority"
 conda config --set channel_priority strict
 
 CPP_CHANNEL=$(rapids-download-from-github "$(rapids-artifact-name conda_cpp libcuopt cuopt --cuda "$RAPIDS_CUDA_VERSION")")
+source ./ci/use_conda_packages_from_prs.sh
 
 rapids-logger "Generate C++ testing dependencies"
+source ./ci/use_conda_packages_from_prs.sh
 rapids-dependency-file-generator \
   --output conda \
   --file-key test_cpp \
+  --prepend-channel "${LIBRAFT_CHANNEL}" \
+  --prepend-channel "${RAFT_CHANNEL}" \
   --prepend-channel "${CPP_CHANNEL}" \
   --matrix "cuda=${RAPIDS_CUDA_VERSION%.*};arch=$(arch)" | tee env.yaml
 
diff --git a/ci/test_cpp_memcheck.sh b/ci/test_cpp_memcheck.sh
index 373504a13..5ca48329b 100755
--- a/ci/test_cpp_memcheck.sh
+++ b/ci/test_cpp_memcheck.sh
@@ -15,12 +15,16 @@ set -euo pipefail
 rapids-logger "Configuring conda strict channel priority"
 conda config --set channel_priority strict
 
+source ./ci/use_conda_packages_from_prs.sh
 RAPIDS_VERSION="$(rapids-version)"
 
 rapids-logger "Generate C++ testing dependencies"
+source ./ci/use_conda_packages_from_prs.sh
 rapids-dependency-file-generator \
   --output conda \
   --file-key test_cpp \
+  --prepend-channel "${LIBRAFT_CHANNEL}" \
+  --prepend-channel "${RAFT_CHANNEL}" \
   --matrix "cuda=${RAPIDS_CUDA_VERSION%.*};arch=$(arch)" | tee env.yaml
 
 rapids-mamba-retry env create --yes -f env.yaml -n test
diff --git a/ci/test_notebooks.sh b/ci/test_notebooks.sh
index 461b8092d..9ef8784ce 100755
--- a/ci/test_notebooks.sh
+++ b/ci/test_notebooks.sh
@@ -14,13 +14,17 @@ rapids-logger "Downloading artifacts from previous jobs"
 CPP_CHANNEL=$(rapids-download-from-github "$(rapids-artifact-name conda_cpp libcuopt cuopt --cuda "$RAPIDS_CUDA_VERSION")")
 PYTHON_CHANNEL=$(rapids-download-from-github "$(rapids-artifact-name conda_python cuopt cuopt --py "$RAPIDS_PY_VERSION" --cuda "$RAPIDS_CUDA_VERSION")")
 
+source ./ci/use_conda_packages_from_prs.sh
 rapids-logger "Generate notebook testing dependencies"
 
 ENV_YAML_DIR="$(mktemp -d)"
 
+source ./ci/use_conda_packages_from_prs.sh
 rapids-dependency-file-generator \
   --output conda \
   --file-key test_notebooks \
+  --prepend-channel "${LIBRAFT_CHANNEL}" \
+  --prepend-channel "${RAFT_CHANNEL}" \
   --prepend-channel "${CPP_CHANNEL}" \
   --prepend-channel "${PYTHON_CHANNEL}" \
   --matrix "cuda=${RAPIDS_CUDA_VERSION%.*};arch=$(arch);py=${RAPIDS_PY_VERSION}" | tee "${ENV_YAML_DIR}/env.yaml"
diff --git a/ci/test_python.sh b/ci/test_python.sh
index e346ea5fd..707e99c61 100755
--- a/ci/test_python.sh
+++ b/ci/test_python.sh
@@ -14,10 +14,13 @@ rapids-logger "Downloading artifacts from previous jobs"
 CPP_CHANNEL=$(rapids-download-from-github "$(rapids-artifact-name conda_cpp libcuopt cuopt --cuda "$RAPIDS_CUDA_VERSION")")
 PYTHON_CHANNEL=$(rapids-download-from-github "$(rapids-artifact-name conda_python cuopt cuopt --py "$RAPIDS_PY_VERSION" --cuda "$RAPIDS_CUDA_VERSION")")
 
+source ./ci/use_conda_packages_from_prs.sh
 rapids-logger "Generate Python testing dependencies"
 rapids-dependency-file-generator \
   --output conda \
   --file-key test_python \
+  --prepend-channel "${LIBRAFT_CHANNEL}" \
+  --prepend-channel "${RAFT_CHANNEL}" \
   --prepend-channel "${CPP_CHANNEL}" \
   --prepend-channel "${PYTHON_CHANNEL}" \
   --matrix "cuda=${RAPIDS_CUDA_VERSION%.*};arch=$(arch);py=${RAPIDS_PY_VERSION}" | tee env.yaml
diff --git a/ci/test_self_hosted_service.sh b/ci/test_self_hosted_service.sh
index 85498b16e..20d226afd 100755
--- a/ci/test_self_hosted_service.sh
+++ b/ci/test_self_hosted_service.sh
@@ -12,6 +12,7 @@ LIBCUOPT_WHEELHOUSE=$(rapids-download-from-github "$(rapids-artifact-name wheel_
 CUOPT_WHEELHOUSE=$(rapids-download-from-github "$(rapids-artifact-name wheel_python cuopt cuopt --py "$RAPIDS_PY_VERSION" --cuda "$RAPIDS_CUDA_VERSION")")
 CUOPT_SERVER_WHEELHOUSE=$(rapids-download-from-github "$(rapids-artifact-name wheel_python cuopt-server cuopt --pure --arch any --cuda "$RAPIDS_CUDA_VERSION")")
 
+source ./ci/use_wheels_from_prs.sh
 # generate constraints (possibly pinning to oldest support versions of dependencies)
 rapids-generate-pip-constraints test_python "${PIP_CONSTRAINT}"
 
diff --git a/ci/test_wheel_cuopt.sh b/ci/test_wheel_cuopt.sh
index 12c8d2396..f9e853bd6 100755
--- a/ci/test_wheel_cuopt.sh
+++ b/ci/test_wheel_cuopt.sh
@@ -20,6 +20,7 @@ LIBCUOPT_WHEELHOUSE=$(rapids-download-from-github "$(rapids-artifact-name wheel_
 CUOPT_WHEELHOUSE=$(rapids-download-from-github "$(rapids-artifact-name wheel_python cuopt cuopt --py "$RAPIDS_PY_VERSION" --cuda "$RAPIDS_CUDA_VERSION")")
 CUOPT_SH_CLIENT_WHEELHOUSE=$(rapids-download-from-github "$(rapids-artifact-name wheel_python cuopt-sh-client cuopt --pure --arch any)")
 
+source ./ci/use_wheels_from_prs.sh
 # update pip constraints.txt to ensure all future 'pip install' (including those in ci/thirdparty-testing)
 # use these wheels for cuopt packages
 cat > "${PIP_CONSTRAINT}" <<EOF
diff --git a/ci/test_wheel_cuopt_server.sh b/ci/test_wheel_cuopt_server.sh
index df1749a3b..e86836d92 100755
--- a/ci/test_wheel_cuopt_server.sh
+++ b/ci/test_wheel_cuopt_server.sh
@@ -18,6 +18,7 @@ CUOPT_WHEELHOUSE=$(rapids-download-from-github "$(rapids-artifact-name wheel_pyt
 CUOPT_SERVER_WHEELHOUSE=$(rapids-download-from-github "$(rapids-artifact-name wheel_python cuopt-server cuopt --pure --arch any --cuda "$RAPIDS_CUDA_VERSION")")
 CUOPT_SH_CLIENT_WHEELHOUSE=$(rapids-download-from-github "$(rapids-artifact-name wheel_python cuopt-sh-client cuopt --pure --arch any)")
 
+source ./ci/use_wheels_from_prs.sh
 # generate constraints (possibly pinning to oldest support versions of dependencies)
 rapids-generate-pip-constraints test_python "${PIP_CONSTRAINT}"
 
diff --git a/ci/use_conda_packages_from_prs.sh b/ci/use_conda_packages_from_prs.sh
new file mode 100755
index 000000000..a74879e48
--- /dev/null
+++ b/ci/use_conda_packages_from_prs.sh
@@ -0,0 +1,30 @@
+#!/bin/bash
+# SPDX-FileCopyrightText: Copyright (c) 2025-2026, NVIDIA CORPORATION.
+# SPDX-License-Identifier: Apache-2.0
+
+# download CI artifacts
+LIBRAFT_CHANNEL=$(rapids-get-pr-artifact raft 3052 cpp conda)
+RAFT_CHANNEL=$(rapids-get-pr-artifact raft 3052 python conda)
+
+# For `rattler` builds:
+#
+# Add these channels to the array checked by 'rapids-rattler-channel-string'.
+# This ensures that when conda packages are built with strict channel priority enabled,
+# the locally-downloaded packages will be preferred to remote packages (e.g. nightlies).
+#
+RAPIDS_PREPENDED_CONDA_CHANNELS=(
+    "${LIBRAFT_CHANNEL}"
+    "${RAFT_CHANNEL}"
+)
+export RAPIDS_PREPENDED_CONDA_CHANNELS
+
+# For tests and `conda-build` builds:
+#
+# Add these channels to the system-wide conda configuration.
+# This results in PREPENDING them to conda's channel list, so
+# these packages should be found first if strict channel priority is enabled.
+#
+for _channel in "${RAPIDS_PREPENDED_CONDA_CHANNELS[@]}"
+do
+   conda config --system --add channels "${_channel}"
+done
diff --git a/ci/use_wheels_from_prs.sh b/ci/use_wheels_from_prs.sh
new file mode 100755
index 000000000..42ebec25b
--- /dev/null
+++ b/ci/use_wheels_from_prs.sh
@@ -0,0 +1,18 @@
+#!/bin/bash
+# SPDX-FileCopyrightText: Copyright (c) 2025-2026, NVIDIA CORPORATION.
+# SPDX-License-Identifier: Apache-2.0
+
+# initialize PIP_CONSTRAINT
+source rapids-init-pip
+
+RAPIDS_PY_CUDA_SUFFIX=$(rapids-wheel-ctk-name-gen "${RAPIDS_CUDA_VERSION}")
+
+# download wheels, store the directories holding them in variables
+LIBRAFT_WHEELHOUSE=$(rapids-get-pr-artifact raft 3052 cpp wheel)
+PYLIBRAFT_WHEELHOUSE=$(rapids-get-pr-artifact raft 3052 python wheel --pkg_name pylibraft)
+
+# write a pip constraints file saying e.g. "whenever you encounter a requirement for 'librmm-cu12', use this wheel"
+cat > "${PIP_CONSTRAINT}" <<EOF
+libraft-${RAPIDS_PY_CUDA_SUFFIX} @ file://$(echo "${LIBRAFT_WHEELHOUSE}"/libraft_*.whl)
+raft-${RAPIDS_PY_CUDA_SUFFIX} @ file://$(echo "${PYLIBRAFT_WHEELHOUSE}"/pylibraft_*.whl)
+EOF