diff --git a/conda/environments/all_cuda-129_arch-aarch64.yaml b/conda/environments/all_cuda-129_arch-aarch64.yaml
index 36e94865..dca566b0 100644
--- a/conda/environments/all_cuda-129_arch-aarch64.yaml
+++ b/conda/environments/all_cuda-129_arch-aarch64.yaml
@@ -15,7 +15,7 @@ dependencies:
 - cuda-nvcc
 - cuda-version=12.9
 - cudf==26.6.*,>=0.0.0a0
-- cupy>=13.6.0
+- cupy>=13.6.0,!=14.0.0,!=14.1.0
 - cxx-compiler
 - cython>=3.2.2
 - dask-cuda==26.6.*,>=0.0.0a0
diff --git a/conda/environments/all_cuda-129_arch-x86_64.yaml b/conda/environments/all_cuda-129_arch-x86_64.yaml
index 79188310..27dcc188 100644
--- a/conda/environments/all_cuda-129_arch-x86_64.yaml
+++ b/conda/environments/all_cuda-129_arch-x86_64.yaml
@@ -15,7 +15,7 @@ dependencies:
 - cuda-nvcc
 - cuda-version=12.9
 - cudf==26.6.*,>=0.0.0a0
-- cupy>=13.6.0
+- cupy>=13.6.0,!=14.0.0,!=14.1.0
 - cxx-compiler
 - cython>=3.2.2
 - dask-cuda==26.6.*,>=0.0.0a0
diff --git a/conda/environments/all_cuda-132_arch-aarch64.yaml b/conda/environments/all_cuda-132_arch-aarch64.yaml
index 48e0e1b4..53ab7ab1 100644
--- a/conda/environments/all_cuda-132_arch-aarch64.yaml
+++ b/conda/environments/all_cuda-132_arch-aarch64.yaml
@@ -15,7 +15,7 @@ dependencies:
 - cuda-nvcc
 - cuda-version=13.2
 - cudf==26.6.*,>=0.0.0a0
-- cupy>=13.6.0
+- cupy>=13.6.0,!=14.0.0,!=14.1.0
 - cxx-compiler
 - cython>=3.2.2
 - dask-cuda==26.6.*,>=0.0.0a0
diff --git a/conda/environments/all_cuda-132_arch-x86_64.yaml b/conda/environments/all_cuda-132_arch-x86_64.yaml
index e14b7e73..8b2ca75b 100644
--- a/conda/environments/all_cuda-132_arch-x86_64.yaml
+++ b/conda/environments/all_cuda-132_arch-x86_64.yaml
@@ -15,7 +15,7 @@ dependencies:
 - cuda-nvcc
 - cuda-version=13.2
 - cudf==26.6.*,>=0.0.0a0
-- cupy>=13.6.0
+- cupy>=13.6.0,!=14.0.0,!=14.1.0
 - cxx-compiler
 - cython>=3.2.2
 - dask-cuda==26.6.*,>=0.0.0a0
diff --git a/conda/recipes/ucxx/recipe.yaml b/conda/recipes/ucxx/recipe.yaml
index 02ddcce1..e2559b21 100644
--- a/conda/recipes/ucxx/recipe.yaml
+++ b/conda/recipes/ucxx/recipe.yaml
@@ -109,7 +109,7 @@ outputs:
         - ${{ pin_compatible("rmm", upper_bound="x.x") }}
         - libucxx =${{ version }}
       run_constraints:
-        - cupy >=13.6.0
+        - cupy >=13.6.0,!=14.0.0,!=14.1.0
       ignore_run_exports:
         by_name:
           - cuda-cudart
diff --git a/dependencies.yaml b/dependencies.yaml
index 5de994ab..bcef83b8 100644
--- a/dependencies.yaml
+++ b/dependencies.yaml
@@ -436,18 +436,18 @@ dependencies:
     common:
       - output_types: conda
         packages:
-          - cupy>=13.6.0
+          - cupy>=13.6.0,!=14.0.0,!=14.1.0
     specific:
       - output_types: [requirements, pyproject]
         matrices:
           - matrix:
               cuda: "12.*"
             packages:
-              - cupy-cuda12x>=13.6.0
+              - cupy-cuda12x>=13.6.0,!=14.0.0,!=14.1.0
           # fallback to CUDA 13 versions if 'cuda' is '13.*' or not provided
           - matrix:
             packages:
-              - &cupy_cuda13 cupy-cuda13x>=13.6.0
+              - &cupy_cuda13 cupy-cuda13x>=13.6.0,!=14.0.0,!=14.1.0
   depends_on_librmm:
     common:
       - output_types: conda
diff --git a/python/distributed-ucxx/pyproject.toml b/python/distributed-ucxx/pyproject.toml
index bf26ddf9..6270a0aa 100644
--- a/python/distributed-ucxx/pyproject.toml
+++ b/python/distributed-ucxx/pyproject.toml
@@ -46,7 +46,7 @@ docs = [
 ]
 test = [
     "cudf==26.6.*,>=0.0.0a0",
-    "cupy-cuda13x>=13.6.0",
+    "cupy-cuda13x>=13.6.0,!=14.0.0,!=14.1.0",
     "numba-cuda>=0.22.1,<0.29.0",
     "numpy>=1.23,<3.0",
     "pytest",
diff --git a/python/ucxx/pyproject.toml b/python/ucxx/pyproject.toml
index 346b32be..70da8600 100644
--- a/python/ucxx/pyproject.toml
+++ b/python/ucxx/pyproject.toml
@@ -43,7 +43,7 @@ ucxx = "ucxx"
 test = [
     "cloudpickle",
     "cudf==26.6.*,>=0.0.0a0",
-    "cupy-cuda13x>=13.6.0",
+    "cupy-cuda13x>=13.6.0,!=14.0.0,!=14.1.0",
     "numba-cuda>=0.22.1,<0.29.0",
     "pytest",
     "pytest-asyncio>=1.0.0",