diff --git a/conda/environments/all_cuda-121_arch-x86_64.yaml b/conda/environments/all_cuda-121_arch-x86_64.yaml
index c9f1a9e53..720abfe65 100644
--- a/conda/environments/all_cuda-121_arch-x86_64.yaml
+++ b/conda/environments/all_cuda-121_arch-x86_64.yaml
@@ -37,6 +37,7 @@ dependencies:
 - libgrpc=1.59
 - libhwloc=2.9.2
 - librmm=24.02
+- libxml2=2.11.6
 - llvmdev=16
 - ninja=1.11
 - nlohmann_json=3.9
diff --git a/conda/environments/ci_cuda-121_arch-x86_64.yaml b/conda/environments/ci_cuda-121_arch-x86_64.yaml
index c531be3e9..66affd1c5 100644
--- a/conda/environments/ci_cuda-121_arch-x86_64.yaml
+++ b/conda/environments/ci_cuda-121_arch-x86_64.yaml
@@ -28,6 +28,7 @@ dependencies:
 - libgrpc=1.59
 - libhwloc=2.9.2
 - librmm=24.02
+- libxml2=2.11.6
 - ninja=1.11
 - nlohmann_json=3.9
 - numactl-libs-cos7-x86_64
diff --git a/dependencies.yaml b/dependencies.yaml
index 182c2eedf..6446284ec 100644
--- a/dependencies.yaml
+++ b/dependencies.yaml
@@ -70,6 +70,7 @@ dependencies:
           - pybind11-stubgen=0.10
           - scikit-build=0.17
           - ucx=1.15
+          - libxml2=2.11.6 # pin to prevent libhwloc round-trip serialization bug
 
   checks:
     common: