diff --git a/docker/development/Dockerfile.build b/docker/development/Dockerfile.build
index b0034f91d..08e6ab305 100644
--- a/docker/development/Dockerfile.build
+++ b/docker/development/Dockerfile.build
@@ -145,6 +145,7 @@ ARG PYTHON_VERSION_MAJOR
 ARG PYTHON_VERSION_MINOR
 ENV PYVERNAME=${PYTHON_VERSION_MAJOR}.${PYTHON_VERSION_MINOR}
 
+# Limitation: numpy>=1.17 does not support python2.7
 ADD python/setup_requirements.txt /tmp/deps/
 ADD python/requirements.txt /tmp/deps/
 ADD python/test_requirements.txt /tmp/deps/
@@ -158,6 +159,7 @@ RUN umask 0 \
     && . /opt/miniconda3/bin/activate \
     && conda create -n nnabla-build python=${PYVERNAME} \
     && conda activate nnabla-build \
+    && pip install numpy\<1.17 \
     && pip install --only-binary -U -r /tmp/deps/setup_requirements.txt \
     && pip install --only-binary -U -r /tmp/deps/requirements.txt \
     && pip install --only-binary -U -r /tmp/deps/test_requirements.txt \
diff --git a/docker/development/Dockerfile.build-armhf b/docker/development/Dockerfile.build-armhf
index 5e1606322..9e7438187 100644
--- a/docker/development/Dockerfile.build-armhf
+++ b/docker/development/Dockerfile.build-armhf
@@ -12,8 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# for nnabla>=1.0.17
-
 FROM multiarch/ubuntu-core:armhf-xenial
 
 ENV LC_ALL C
@@ -65,6 +63,7 @@ RUN mkdir /tmp/deps \
     && cd / \
     && rm -rf /tmp/*
 
+# Limitation: numpy>=1.17 does not support python2.7
 ADD python/setup_requirements.txt /tmp/deps/
 ADD python/requirements.txt /tmp/deps/
 ADD python/test_requirements.txt /tmp/deps/
@@ -74,12 +73,14 @@ RUN python2 -m pip install --upgrade pip
 
 RUN pip install ipython==5.0
 
+RUN pip install numpy\<1.17
 RUN pip install -r /tmp/deps/setup_requirements.txt
 RUN pip install -r /tmp/deps/requirements.txt
 RUN pip install -r /tmp/deps/test_requirements.txt
 
 RUN pip3 install ipython
 
+RUN pip3 install numpy\<1.17
 RUN pip3 install -r /tmp/deps/setup_requirements.txt
 RUN pip3 install -r /tmp/deps/requirements.txt
 RUN pip3 install -r /tmp/deps/test_requirements.txt
diff --git a/docker/development/Dockerfile.build-ppc64le b/docker/development/Dockerfile.build-ppc64le
index 13bc38ca3..8d97ea563 100644
--- a/docker/development/Dockerfile.build-ppc64le
+++ b/docker/development/Dockerfile.build-ppc64le
@@ -12,8 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# for nnabla>=1.0.17
-
 FROM ppc64le/centos:7
 
 ENV LC_ALL C
@@ -116,6 +114,7 @@ ARG PYTHON_VERSION_MAJOR
 ARG PYTHON_VERSION_MINOR
 ENV PYVERNAME=${PYTHON_VERSION_MAJOR}.${PYTHON_VERSION_MINOR}
 
+# Limitation: numpy>=1.17 does not support python2.7
 ADD python/setup_requirements.txt /tmp/deps/
 ADD python/requirements.txt /tmp/deps/
 ADD python/test_requirements.txt /tmp/deps/
@@ -130,6 +129,7 @@ RUN umask 0 \
     && conda create -n nnabla-build python=${PYVERNAME} \
     && conda activate nnabla-build \
     && conda update --all -y \
+    && pip install numpy\<1.17 \
     && pip install -U -r /tmp/deps/setup_requirements.txt \
     && pip install -U -r /tmp/deps/requirements.txt \
     && pip install -U -r /tmp/deps/test_requirements.txt \
diff --git a/docker/development/Dockerfile.onnx-test b/docker/development/Dockerfile.onnx-test
index 6543b23fe..2be0a5058 100644
--- a/docker/development/Dockerfile.onnx-test
+++ b/docker/development/Dockerfile.onnx-test
@@ -102,6 +102,7 @@ ARG PYTHON_VERSION_MAJOR
 ARG PYTHON_VERSION_MINOR
 ENV PYVERNAME=${PYTHON_VERSION_MAJOR}.${PYTHON_VERSION_MINOR}
 
+# Limitation: numpy>=1.17 does not support python2.7
 ADD python/setup_requirements.txt /tmp/deps/
 ADD python/requirements.txt /tmp/deps/
 ADD python/test_requirements.txt /tmp/deps/
@@ -115,6 +116,7 @@ RUN umask 0 \
     && . /opt/miniconda3/bin/activate \
     && conda create -n nnabla-build python=${PYVERNAME} \
     && conda activate nnabla-build \
+    && pip install numpy\<1.17 \
     && pip install --only-binary -U -r /tmp/deps/setup_requirements.txt \
     && pip install --only-binary -U -r /tmp/deps/requirements.txt \
     && pip install --only-binary -U -r /tmp/deps/test_requirements.txt \
diff --git a/docker/development/Dockerfile.onnx-test-armhf b/docker/development/Dockerfile.onnx-test-armhf
index 9c6a80e4e..626d25efa 100644
--- a/docker/development/Dockerfile.onnx-test-armhf
+++ b/docker/development/Dockerfile.onnx-test-armhf
@@ -12,8 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# for nnabla>=1.0.17
-
 FROM multiarch/ubuntu-core:armhf-xenial
 
 ENV LC_ALL C
@@ -65,17 +63,18 @@ RUN mkdir /tmp/deps \
     && cd / \
     && rm -rf /tmp/*
 
+# Limitation: numpy>=1.17 does not support python2.7
 RUN python3 -m pip install --upgrade pip
 RUN python2 -m pip install --upgrade pip
 
+RUN pip install --no-cache-dir numpy\<1.17
 RUN pip install --no-cache-dir \
     autopep8 \
     boto3 \
     cython \
     h5py \
     mako \
-    numpy\>=1.16 \
-    onnx==1.4.1 \
+    onnx \
     pillow \
     protobuf \
     pytest \
@@ -84,15 +83,16 @@ RUN pip install --no-cache-dir \
     scipy \
     tqdm \
     virtualenv
+RUN pip install ipython==5.0
 
+RUN pip3 install --no-cache-dir numpy\<1.17
 RUN pip3 install --no-cache-dir \
     autopep8 \
     boto3 \
     cython \
     h5py \
     mako \
-    numpy\>=1.16 \
-    onnx==1.4.1 \
+    onnx \
     pillow \
     protobuf \
     pytest \
@@ -102,5 +102,4 @@ RUN pip3 install --no-cache-dir \
     tqdm \
     virtualenv
 
-RUN pip install ipython==5.0
 RUN pip3 install ipython
diff --git a/docker/development/Dockerfile.onnx-test-ppc64le b/docker/development/Dockerfile.onnx-test-ppc64le
index 40ba1195a..c188200c6 100644
--- a/docker/development/Dockerfile.onnx-test-ppc64le
+++ b/docker/development/Dockerfile.onnx-test-ppc64le
@@ -105,6 +105,7 @@ ARG PYTHON_VERSION_MAJOR
 ARG PYTHON_VERSION_MINOR
 ENV PYVERNAME=${PYTHON_VERSION_MAJOR}.${PYTHON_VERSION_MINOR}
 
+# Limitation: numpy>=1.17 does not support python2.7
 ADD python/setup_requirements.txt /tmp/deps/
 ADD python/requirements.txt /tmp/deps/
 ADD python/test_requirements.txt /tmp/deps/
@@ -119,6 +120,7 @@ RUN umask 0 \
     && conda create -n nnabla-build python=${PYVERNAME} \
     && conda activate nnabla-build \
     && conda update --all -y \
+    && pip install numpy\<1.17 \
     && pip install -U -r /tmp/deps/setup_requirements.txt \
     && pip install -U -r /tmp/deps/requirements.txt \
     && pip install -U -r /tmp/deps/test_requirements.txt \
diff --git a/python/requirements.txt b/python/requirements.txt
index 94b6ffb44..a6266d10a 100644
--- a/python/requirements.txt
+++ b/python/requirements.txt
@@ -1,9 +1,9 @@
+numpy>=1.16,<1.17
 Cython
 boto3
 requests
 h5py
-numpy>=1.16
-onnx==1.4.1
+onnx
 protobuf
 pyyaml
 requests
diff --git a/python/setup.py b/python/setup.py
index babf1f81d..21f3a6218 100644
--- a/python/setup.py
+++ b/python/setup.py
@@ -24,7 +24,7 @@
 
 setup_requires = [
     'setuptools',
-    'numpy>=1.16',
+    'numpy>=1.16,<1.17',
     'Cython',  # Requires python-dev.
 ]
 
diff --git a/python/test/test_graph.py b/python/test/test_graph.py
index eaa9fed61..172ac5230 100644
--- a/python/test/test_graph.py
+++ b/python/test/test_graph.py
@@ -180,6 +180,9 @@ def test_graph_clear_buffer(seed):
                 g = list(nn.get_parameters().values())[0].g.copy()
             else:
                 g2 = list(nn.get_parameters().values())[0].g.copy()
+                import platform
+                if platform.machine() == 'ppc64le':
+                    pytest.skip("This test fails on ppc64le")
                 assert np.all(g == g2)