diff --git a/CMakeLists.txt b/CMakeLists.txt
index 304852f71afd1f094f810c81854585f37511cf68..20f6413dfa7d28582fb5fd0a86e7a68c32616a5a 100755
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -323,7 +323,7 @@ unset(WITH_RECORD_BUILDTIME CACHE)
 
 # PY_VERSION
 if(NOT PY_VERSION)
-  set(PY_VERSION 3.6)
+  set(PY_VERSION 3.7)
 endif()
 set(PYBIND11_PYTHON_VERSION ${PY_VERSION})
 
diff --git a/cmake/external/python.cmake b/cmake/external/python.cmake
index bc58c9d7b6c35f605b28f50d00c556a45ff836af..b8ab55f60418624fc5426b9940062e77c7557066 100644
--- a/cmake/external/python.cmake
+++ b/cmake/external/python.cmake
@@ -14,6 +14,9 @@
 
 include(python_module)
 
+check_py_version(${PY_VERSION})
+
+# Find Python with mnimum PY_VERSION specified or will raise error!
 find_package(PythonInterp ${PY_VERSION} REQUIRED)
 find_package(PythonLibs ${PY_VERSION} REQUIRED)
 
@@ -79,5 +82,6 @@ if(PYTHONINTERP_FOUND)
         "please use pip to upgrade protobuf. pip install -U protobuf")
   endif()
 endif(PYTHONINTERP_FOUND)
+
 include_directories(${PYTHON_INCLUDE_DIR})
 include_directories(${PYTHON_NUMPY_INCLUDE_DIR})
diff --git a/cmake/python_module.cmake b/cmake/python_module.cmake
index 47e449c9dadb15192f0ed269a6f292af4bbdd43c..b4b6fce8cc34fadccac5fa4133f6b9c613232eb2 100644
--- a/cmake/python_module.cmake
+++ b/cmake/python_module.cmake
@@ -48,3 +48,20 @@ function(find_python_module module)
       ${PY_${module_upper}_VERSION}
       PARENT_SCOPE)
 endfunction()
+
+function(check_py_version py_version)
+  string(REPLACE "." ";" version_list ${py_version})
+  list(LENGTH version_list version_list_len)
+  if(version_list_len LESS 2)
+    message(FATAL_ERROR "Please input Python version, eg:3.7 or 3.8 and so on")
+  endif()
+
+  list(GET version_list 0 version_major)
+  list(GET version_list 1 version_minor)
+
+  if((version_major GREATER_EQUAL 3) AND (version_minor GREATER_EQUAL 7))
+
+  else()
+    message(FATAL_ERROR "Paddle only support Python version >=3.7 now!")
+  endif()
+endfunction()
diff --git a/paddle/fluid/inference/api/demo_ci/run_windows_demo.bat b/paddle/fluid/inference/api/demo_ci/run_windows_demo.bat
index d17f516fcca5e8fd3e254e31d3f30a09a717cc5b..6eb932a1906545a925ae3b36eba82475cd1f598e 100644
--- a/paddle/fluid/inference/api/demo_ci/run_windows_demo.bat
+++ b/paddle/fluid/inference/api/demo_ci/run_windows_demo.bat
@@ -101,7 +101,7 @@ if NOT EXIST "%source_path%\%model_name%.tar.gz" (
 
 if EXIST "%source_path%\%model_name%.tar.gz" (
   if NOT EXIST "%source_path%\%model_name%" (
-    SET /P python_path="Please input the path of python.exe, such as C:\Python35\python.exe, C:\Python35\python3.exe   =======>"
+    SET /P python_path="Please input the path of python.exe, such as C:\Python37\python.exe =======>"
     set tmp_var=!python_path!
     call:remove_space
     set python_path=!tmp_var!   
diff --git a/paddle/scripts/fast_install.sh b/paddle/scripts/fast_install.sh
index cacec55d3bc228bb8d3c08c642719b5c0fefb772..d4e30d75c824b65ac9d089e4277142fc3e81434a 100644
--- a/paddle/scripts/fast_install.sh
+++ b/paddle/scripts/fast_install.sh
@@ -920,7 +920,7 @@ function checkMacPip(){
             if [[ "$version_list" != "" ]];then
                return 0
              else
-               red "未找到可用的pip或pip3。PaddlePaddle目前支持：Python2.7/3.5/3.6/3.7及其对应的pip, 请重新输入，或使用ctrl + c退出"
+               red "未找到可用的pip或pip3。PaddlePaddle目前支持：Python >= 3.7及其对应的pip, 请重新输入，或使用ctrl + c退出"
                echo
                clearMacPythonEnv
                return 1
diff --git a/paddle/scripts/paddle_build.sh b/paddle/scripts/paddle_build.sh
index b39a8945eb7135af1a5ee2ab0a3d1d7166db3358..8a61ab633803e0cfee53a5c6e3e84adc61650e37 100755
--- a/paddle/scripts/paddle_build.sh
+++ b/paddle/scripts/paddle_build.sh
@@ -235,7 +235,7 @@ function cmake_base() {
         -DWITH_INFERENCE_API_TEST=${WITH_INFERENCE_API_TEST:-ON}
         -DWITH_INFRT=${WITH_INFRT:-OFF}
         -DINFERENCE_DEMO_INSTALL_DIR=${INFERENCE_DEMO_INSTALL_DIR}
-        -DPY_VERSION=${PY_VERSION:-2.7}
+        -DPY_VERSION=${PY_VERSION:-3.7}
         -DCMAKE_INSTALL_PREFIX=${INSTALL_PREFIX:-/paddle/build}
         -DWITH_PSCORE=${distibuted_flag}
         -DWITH_PSLIB=${WITH_PSLIB:-OFF}
@@ -290,7 +290,7 @@ EOF
         -DWITH_INFERENCE_API_TEST=${WITH_INFERENCE_API_TEST:-ON} \
         -DWITH_INFRT=${WITH_INFRT:-OFF} \
         -DINFERENCE_DEMO_INSTALL_DIR=${INFERENCE_DEMO_INSTALL_DIR} \
-        -DPY_VERSION=${PY_VERSION:-2.7} \
+        -DPY_VERSION=${PY_VERSION:-3.7} \
         -DCMAKE_INSTALL_PREFIX=${INSTALL_PREFIX:-/paddle/build} \
         -DWITH_PSCORE=${distibuted_flag} \
         -DWITH_PSLIB=${WITH_PSLIB:-OFF} \
diff --git a/paddle/scripts/windows_build/config.ini b/paddle/scripts/windows_build/config.ini
index 750d7af8c29266d93bcc8d2049ec1091933285a8..d5bfa548024ceba44ab1c3d29f057a67b7eb9732 100644
--- a/paddle/scripts/windows_build/config.ini
+++ b/paddle/scripts/windows_build/config.ini
@@ -16,4 +16,4 @@ PYTHON3_PATH=C:\Python37
 
 CUDA_PATH="C:/Program Files/NVIDIA GPU Computing Toolkit/CUDA/v10.0" "C:/Program Files/NVIDIA GPU Computing Toolkit/CUDA/v9.0"
 
-PYTHON_PATH=C:\Python27 C:\Python37
\ No newline at end of file
+PYTHON_PATH=C:\Python37
diff --git a/python/setup.py.in b/python/setup.py.in
index 14ebb8749baa68522712787727cdd16393f945cf..0e25a34f801d58e790422bd3a7ff9b8895112b06 100755
--- a/python/setup.py.in
+++ b/python/setup.py.in
@@ -418,22 +418,9 @@ packages=['paddle',
 with open('@PADDLE_SOURCE_DIR@/python/requirements.txt') as f:
     setup_requires = f.read().splitlines()
 
-# Note(wangzhongpu):
-# When compiling paddle under python36, the dependencies belonging to python2.7 will be imported, resulting in errors when installing paddle
-if sys.version_info >= (3,6) and sys.version_info < (3,7):
-    setup_requires_tmp = []
-    for setup_requires_i in setup_requires:
-        if "<\"3.6\"" in setup_requires_i or "<\"3.5\"" in setup_requires_i or "<=\"3.5\"" in setup_requires_i:
-            continue
-        setup_requires_tmp+=[setup_requires_i]
-    setup_requires = setup_requires_tmp
-if sys.version_info >= (3,5) and sys.version_info < (3,6):
-    setup_requires_tmp = []
-    for setup_requires_i in setup_requires:
-        if "<\"3.5\"" in setup_requires_i:
-            continue
-        setup_requires_tmp+=[setup_requires_i]
-    setup_requires = setup_requires_tmp
+if sys.version_info < (3,7):
+    raise RuntimeError("Paddle only support Python version>=3.7 now")
+
 if sys.version_info >= (3,7):
     setup_requires_tmp = []
     for setup_requires_i in setup_requires:
diff --git a/tools/dockerfile/Dockerfile.release16 b/tools/dockerfile/Dockerfile.release16
index 49637a3fee9a4e438626088726cec86d83e50078..8345fb4d966fa87df6cdede9d911937015513112 100644
--- a/tools/dockerfile/Dockerfile.release16
+++ b/tools/dockerfile/Dockerfile.release16
@@ -62,7 +62,7 @@ ENV CPLUS_INCLUDE_PATH=/usr/local/python3.7.0/include/python3.7:$CPLUS_INCLUDE_P
 RUN ln -sf /usr/local/python3.7.0/bin/python3.7 /usr/local/bin/python3 && ln -sf /usr/local/python3.7.0/bin/python3.7 /usr/bin/python3
 RUN mv /usr/bin/python /usr/bin/python.bak && ln -s /usr/local/python3.7.0/bin/python3.7 /usr/local/bin/python && ln -s /usr/local/python3.7.0/bin/python3.7 /usr/bin/python
 
-RUN rm -r /root/python_build
+RUN rm -rf /root/python_build
 
 WORKDIR /home
 RUN python3.7 -m pip uninstall -y pip setuptools
diff --git a/tools/dockerfile/Dockerfile.ubuntu b/tools/dockerfile/Dockerfile.ubuntu
index 7c9636d57ddf541319efb6111ddc73bdd92e92ca..ad64deb8a22843b9327f0a647fab21ed79513989 100644
--- a/tools/dockerfile/Dockerfile.ubuntu
+++ b/tools/dockerfile/Dockerfile.ubuntu
@@ -45,15 +45,6 @@ WORKDIR /home
 RUN wget -q https://cmake.org/files/v3.16/cmake-3.16.0-Linux-x86_64.tar.gz && tar -zxvf cmake-3.16.0-Linux-x86_64.tar.gz && rm cmake-3.16.0-Linux-x86_64.tar.gz
 ENV PATH=/home/cmake-3.16.0-Linux-x86_64/bin:$PATH
 
-# Install Python3.6
-RUN mkdir -p /root/python_build/ && wget -q https://paddle-ci.gz.bcebos.com/sqlite-autoconf-3250300.tar.gz && \
-    tar -zxf sqlite-autoconf-3250300.tar.gz && cd sqlite-autoconf-3250300 && \
-    ./configure -prefix=/usr/local && make -j8 && make install && cd ../ && rm sqlite-autoconf-3250300.tar.gz && \
-    wget -q https://www.python.org/ftp/python/3.6.0/Python-3.6.0.tgz && \
-    tar -xzf Python-3.6.0.tgz && cd Python-3.6.0 && \
-    CFLAGS="-Wformat" ./configure --prefix=/usr/local/ --enable-shared > /dev/null && \
-    make -j8 > /dev/null && make altinstall > /dev/null && ldconfig
-
 # Install Python3.7
 RUN wget -q https://www.python.org/ftp/python/3.7.0/Python-3.7.0.tgz && \
     tar -xzf Python-3.7.0.tgz && cd Python-3.7.0 && \
@@ -78,7 +69,7 @@ ENV LD_LIBRARY_PATH=/usr/local/python3.7.0/lib:${LD_LIBRARY_PATH}
 ENV CPLUS_INCLUDE_PATH=/usr/local/python3.7.0/include/python3.7:$CPLUS_INCLUDE_PATH
 RUN ln -sf /usr/local/python3.7.0/bin/python3.7 /usr/local/bin/python3 && ln -sf /usr/local/python3.7.0/bin/python3.7 /usr/bin/python3
 
-RUN rm -r /root/python_build
+RUN rm -rf /root/python_build
 
 # Install Python2.7.15 to replace original python
 WORKDIR /home
@@ -101,22 +92,21 @@ RUN python setup.py build && python setup.py install
 WORKDIR /home
 RUN python3.9 -m pip uninstall -y pip setuptools && \
   python3.8 -m pip uninstall -y pip setuptools && \
-  python3.7 -m pip uninstall -y pip setuptools && \
-  python3.6 -m pip uninstall -y pip setuptools
+  python3.7 -m pip uninstall -y pip setuptools
+  
 RUN wget https://files.pythonhosted.org/packages/a7/e0/30642b9c2df516506d40b563b0cbd080c49c6b3f11a70b4c7a670f13a78b/setuptools-50.3.2.zip && apt-get -y install unzip && unzip setuptools-50.3.2.zip
 WORKDIR /home/setuptools-50.3.2
 RUN python3.9 setup.py build && python3.9 setup.py install && \
   python3.8 setup.py build && python3.8 setup.py install && \
-  python3.7 setup.py build && python3.7 setup.py install && \
-  python3.6 setup.py build && python3.6 setup.py install
+  python3.7 setup.py build && python3.7 setup.py install
+  
 WORKDIR /home
 RUN wget https://files.pythonhosted.org/packages/28/af/2c76c8aa46ccdf7578b83d97a11a2d1858794d4be4a1610ade0d30182e8b/pip-20.0.1.tar.gz && tar -zxvf pip-20.0.1.tar.gz
 WORKDIR pip-20.0.1
 RUN python setup.py install && \
   python3.9 setup.py install && \
   python3.8 setup.py install && \
-  python3.7 setup.py install && \
-  python3.6 setup.py install
+  python3.7 setup.py install
 
 WORKDIR /home
 RUN rm Python-$version.tgz setuptools-40.6.2.zip setuptools-50.3.2.zip pip-20.0.1.tar.gz && \
@@ -162,10 +152,7 @@ RUN localedef -i en_US -f UTF-8 en_US.UTF-8
 # specify sphinx version as 1.5.6 and remove -U option for [pip install -U
 # sphinx-rtd-theme] since -U option will cause sphinx being updated to newest
 # version(1.7.1 for now), which causes building documentation failed.
-RUN pip3.6 --no-cache-dir install -U wheel py-cpuinfo==5.0.0 && \
-    pip3.6 --no-cache-dir install -U docopt PyYAML sphinx==1.5.6 && \
-    pip3.6 --no-cache-dir install sphinx-rtd-theme==0.1.9 recommonmark && \
-    pip3.7 --no-cache-dir install -U wheel py-cpuinfo==5.0.0 && \
+RUN pip3.7 --no-cache-dir install -U wheel py-cpuinfo==5.0.0 && \
     pip3.7 --no-cache-dir install -U docopt PyYAML sphinx==1.5.6 && \
     pip3.7 --no-cache-dir install sphinx-rtd-theme==0.1.9 recommonmark && \
     pip3.8 --no-cache-dir install -U wheel py-cpuinfo==5.0.0 && \
@@ -177,9 +164,7 @@ RUN pip3.6 --no-cache-dir install -U wheel py-cpuinfo==5.0.0 && \
     pip --no-cache-dir install -U docopt PyYAML sphinx==1.5.6 && \
     pip --no-cache-dir install sphinx-rtd-theme==0.1.9 recommonmark
 
-RUN pip3.6 --no-cache-dir install 'ipython==5.3.0' && \
-    pip3.6 --no-cache-dir install 'ipykernel==4.6.0' 'jupyter==1.0.0' && \
-    pip3.7 --no-cache-dir install 'ipython==5.3.0' && \
+RUN pip3.7 --no-cache-dir install 'ipython==5.3.0' && \
     pip3.7 --no-cache-dir install 'ipykernel==4.6.0' 'jupyter==1.0.0' && \
     pip3.8 --no-cache-dir install 'ipython==5.3.0' && \
     pip3.8 --no-cache-dir install 'ipykernel==4.6.0' 'jupyter==1.0.0' && \
@@ -189,43 +174,36 @@ RUN pip3.6 --no-cache-dir install 'ipython==5.3.0' && \
     pip --no-cache-dir install 'ipykernel==4.6.0' 'jupyter==1.0.0'
 
 #For docstring checker
-RUN pip3.6 --no-cache-dir install pytest astroid isort && \
-    pip3.7 --no-cache-dir install pytest astroid isort && \
+RUN pip3.7 --no-cache-dir install pytest astroid isort && \
     pip3.8 --no-cache-dir install pytest astroid isort && \
     pip3.9 --no-cache-dir install pytest astroid isort && \
     pip --no-cache-dir install pylint pytest astroid isort
 
 #For pre-commit
-RUN pip3.6 --no-cache-dir install --upgrade pip==20.3.3 && \
-    pip3.7 --no-cache-dir install --upgrade pip && \
+RUN pip3.7 --no-cache-dir install --upgrade pip && \
     pip3.8 --no-cache-dir install --upgrade pip && \
     pip3.9 --no-cache-dir install --upgrade pip
 
-RUN pip3.6 --no-cache-dir install pre-commit==2.1.1 pylint==2.12.0 && \
-    pip3.7 --no-cache-dir install pre-commit==2.17.0 pylint==2.12.0 && \
+RUN pip3.7 --no-cache-dir install pre-commit==2.17.0 pylint==2.12.0 && \
     pip3.8 --no-cache-dir install pre-commit==2.17.0 pylint==2.12.0 && \
     pip3.9 --no-cache-dir install pre-commit==2.17.0 pylint==2.12.0 && \
-    pip3.6 --no-cache-dir install cpplint==1.6.0 clang-format==13.0.0 && \
     pip3.7 --no-cache-dir install cpplint==1.6.0 clang-format==13.0.0 && \
     pip3.8 --no-cache-dir install cpplint==1.6.0 clang-format==13.0.0 && \
     pip3.9 --no-cache-dir install cpplint==1.6.0 clang-format==13.0.0
 
-RUN pip3.6 --no-cache-dir install coverage && \
-    pip3.7 --no-cache-dir install coverage && \
+RUN pip3.7 --no-cache-dir install coverage && \
     pip3.8 --no-cache-dir install coverage && \
     pip3.9 --no-cache-dir install coverage && \
     pip --no-cache-dir install coverage
 
 COPY ./python/requirements.txt /root/
-RUN pip3.6 --no-cache-dir install -r /root/requirements.txt && \
-    pip3.7 --no-cache-dir install -r /root/requirements.txt && \
+RUN pip3.7 --no-cache-dir install -r /root/requirements.txt && \
     pip3.8 --no-cache-dir install -r /root/requirements.txt && \
     pip3.9 --no-cache-dir install -r /root/requirements.txt
 
 # To fix https://github.com/PaddlePaddle/Paddle/issues/1954, we use
 # the solution in https://urllib3.readthedocs.io/en/latest/user-guide.html#ssl-py2
 RUN apt-get install -y libssl-dev libffi-dev && apt-get clean -y && \
-    pip3.6 --no-cache-dir install certifi urllib3[secure] && \
     pip3.7 --no-cache-dir install certifi urllib3[secure] && \
     pip3.8 --no-cache-dir install certifi urllib3[secure] && \
     pip3.9 --no-cache-dir install certifi urllib3[secure] && \
diff --git a/tools/dockerfile/Dockerfile.ubuntu18 b/tools/dockerfile/Dockerfile.ubuntu18
index 8ebfd9b8371c20a049669b8bdb8309b764335625..35397967f283f64c0908ea99bee05deb207db564 100644
--- a/tools/dockerfile/Dockerfile.ubuntu18
+++ b/tools/dockerfile/Dockerfile.ubuntu18
@@ -55,9 +55,7 @@ ENV PATH=/home/cmake-3.16.0-Linux-x86_64/bin:$PATH
 
 
 RUN apt-get update && \
-  apt-get install -y python2.7 python2.7-dev \
-  python3.6 python3.6-dev \
-  python3.7 python3.7-dev \
+  apt-get install -y python3.7 python3.7-dev \
   python3.8 python3.8-dev python3.8-distutils \
   python3.9 python3.9-dev python3.9-distutils && \
   rm /usr/bin/python && ln -s /usr/bin/python3.7 /usr/bin/python && \
@@ -69,24 +67,19 @@ RUN wget https://files.pythonhosted.org/packages/a7/e0/30642b9c2df516506d40b563b
 WORKDIR /home/setuptools-50.3.2
 RUN python3.9 setup.py build && python3.9 setup.py install && \
   python3.8 setup.py build && python3.8 setup.py install && \
-  python3.7 setup.py build && python3.7 setup.py install && \
-  python3.6 setup.py build && python3.6 setup.py install
-WORKDIR /home
-RUN wget https://files.pythonhosted.org/packages/b0/d1/8acb42f391cba52e35b131e442e80deffbb8d0676b93261d761b1f0ef8fb/setuptools-40.6.2.zip && apt-get -y install unzip && unzip setuptools-40.6.2.zip
-WORKDIR /home/setuptools-40.6.2
-RUN python2.7 setup.py build && python2.7 setup.py install
+  python3.7 setup.py build && python3.7 setup.py install
+
 WORKDIR /home
 RUN wget https://files.pythonhosted.org/packages/28/af/2c76c8aa46ccdf7578b83d97a11a2d1858794d4be4a1610ade0d30182e8b/pip-20.0.1.tar.gz && tar -zxvf pip-20.0.1.tar.gz
 WORKDIR pip-20.0.1
-RUN python2.7 setup.py install && \
-  python3.9 setup.py install && \
+
+RUN python3.9 setup.py install && \
   python3.8 setup.py install && \
-  python3.7 setup.py install && \
-  python3.6 setup.py install
+  python3.7 setup.py install
 
 WORKDIR /home
-RUN rm setuptools-40.6.2.zip setuptools-50.3.2.zip pip-20.0.1.tar.gz && \
-    rm -r setuptools-40.6.2 setuptools-50.3.2 pip-20.0.1
+RUN rm setuptools-50.3.2.zip pip-20.0.1.tar.gz && \
+    rm -r setuptools-50.3.2 pip-20.0.1
 RUN rm /usr/local/bin/pip && ln -s /usr/local/bin/pip3.7 /usr/local/bin/pip && \
   rm /usr/local/bin/pip3 && ln -s /usr/local/bin/pip3.7 /usr/local/bin/pip3
 
@@ -116,42 +109,32 @@ RUN git config --global credential.helper store
 # Fix locales to en_US.UTF-8
 RUN localedef -i en_US -f UTF-8 en_US.UTF-8
 
-RUN pip3.6 --no-cache-dir install ipython==5.3.0 && \
-    pip3.6 --no-cache-dir install ipykernel==4.6.0 wheel && \
-    pip3.7 --no-cache-dir install ipython==5.3.0 && \
+RUN pip3.7 --no-cache-dir install ipython==5.3.0 && \
     pip3.7 --no-cache-dir install ipykernel==4.6.0 wheel && \
     pip3.8 --no-cache-dir install ipython==5.3.0 && \
     pip3.8 --no-cache-dir install ipykernel==4.6.0 wheel && \
     pip3.9 --no-cache-dir install ipython==5.3.0 && \
-    pip3.9 --no-cache-dir install ipykernel==4.6.0 wheel && \
-    pip2.7 --no-cache-dir install pre-commit==1.10.4 ipython==5.3.0 && \
-    pip2.7 --no-cache-dir install ipykernel==4.6.0 wheel 
+    pip3.9 --no-cache-dir install ipykernel==4.6.0 wheel
 
 #For docstring checker
-RUN pip3.6 --no-cache-dir install pytest astroid isort && \
-    pip3.7 --no-cache-dir install pytest astroid isort && \
+RUN pip3.7 --no-cache-dir install pytest astroid isort && \
     pip3.8 --no-cache-dir install pytest astroid isort && \
-    pip3.9 --no-cache-dir install pytest astroid isort && \
-    pip2.7 --no-cache-dir install pytest astroid isort
+    pip3.9 --no-cache-dir install pytest astroid isort
 
 #For pre-commit
-RUN pip3.6 --no-cache-dir install --upgrade pip==20.3.3 && \
-    pip3.7 --no-cache-dir install --upgrade pip && \
+RUN pip3.7 --no-cache-dir install --upgrade pip && \
     pip3.8 --no-cache-dir install --upgrade pip && \
     pip3.9 --no-cache-dir install --upgrade pip
 
-RUN pip3.6 --no-cache-dir install pre-commit==2.1.1 pylint==2.12.0 && \
-    pip3.7 --no-cache-dir install pre-commit==2.17.0 pylint==2.12.0 && \
+RUN pip3.7 --no-cache-dir install pre-commit==2.17.0 pylint==2.12.0 && \
     pip3.8 --no-cache-dir install pre-commit==2.17.0 pylint==2.12.0 && \
     pip3.9 --no-cache-dir install pre-commit==2.17.0 pylint==2.12.0 && \
-    pip3.6 --no-cache-dir install cpplint==1.6.0 clang-format==13.0.0 && \
     pip3.7 --no-cache-dir install cpplint==1.6.0 clang-format==13.0.0 && \
     pip3.8 --no-cache-dir install cpplint==1.6.0 clang-format==13.0.0 && \
     pip3.9 --no-cache-dir install cpplint==1.6.0 clang-format==13.0.0
 
 COPY ./python/requirements.txt /root/
-RUN pip3.6 --no-cache-dir install -r /root/requirements.txt && \
-    pip3.7 --no-cache-dir install -r /root/requirements.txt && \
+RUN pip3.7 --no-cache-dir install -r /root/requirements.txt && \
     pip3.8 --no-cache-dir install -r /root/requirements.txt && \
     pip3.9 --no-cache-dir install -r /root/requirements.txt