diff --git a/.travis.yml b/.travis.yml
index d0033b1..7776d62 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,12 +11,12 @@ matrix:
     - os: osx
       language: generic
       env:
-        - PYTHON_VERSION=3.7.8
+        - PYTHON_VERSION=3.7.9
 
     - os: osx
       language: generic
       env:
-        - PYTHON_VERSION=2.7.15
+        - PYTHON_VERSION=2.7.18
 
     - os: linux
       arch: arm64-graviton2
@@ -27,34 +27,33 @@ matrix:
       env:
         - PYTHON_VERSION=3.8.5
 
-before_cache:
-  # Cleanup to avoid the cache to grow indefinitely as new package versions are released
-  # see https://stackoverflow.com/questions/39930171/cache-brew-builds-with-travis-ci
-  - brew cleanup
-
 cache:
   directories:
-    # Cache downloaded bottles
-    - $HOME/Library/Caches/Homebrew
-    # pyenv
-    - $HOME/.pyenv_cache
-    - $HOME/.pyenv/versions/3.7.8
-    - $HOME/.pyenv/versions/2.7.15
     # scikit-ci-addons
     - $HOME/downloads
 
 before_install:
   - |
-    # Workaround the following error occuring because python installation is cached but gettext dependency is not
-    #   dyld: Library not loaded: /usr/local/opt/gettext/lib/libintl.8.dylib
-    #     Referenced from: /Users/travis/.pyenv/versions/3.7.2/bin/python
-    #     Reason: Incompatible library version: python requires version 11.0.0 or later, but libintl.8.dylib provides version 10.0.0
-    if [[ "$TRAVIS_OS_NAME" == "osx" && "${PYTHON_VERSION}" == "3.7.8" ]]; then
-      brew install gettext
+    if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then
+      # Install official python distribution
+      curl -fsSLo /tmp/Python.pkg "https://www.python.org/ftp/python/${PYTHON_VERSION}/python-${PYTHON_VERSION}-macosx10.9.pkg"
+      sudo installer -pkg /tmp/Python.pkg -target /
+      PYTHON_VERSION2=${PYTHON_VERSION%.*}
+      PYTHON_VERSION1=${PYTHON_VERSION2%.*}
+      python_executable=/Library/Frameworks/Python.framework/Versions/${PYTHON_VERSION2}/bin/python${PYTHON_VERSION1}
+      # Install SSL certificates
+      curl -fsSLo /tmp/install_certifi.py https://github.com/joerick/cibuildwheel/raw/v1.10.0/cibuildwheel/resources/install_certifi.py
+      sudo ${python_executable} /tmp/install_certifi.py
+      ${python_executable} scripts/ssl-check.py
+      # Install packages
+      ${python_executable} -m pip install --disable-pip-version-check --upgrade pip
+      ${python_executable} -m pip install virtualenv
+      # Create and activate virtual environment
+      ${python_executable} -m virtualenv ${HOME}/.pyenv/versions/${PYTHON_VERSION}
+      source ${HOME}/.pyenv/versions/${PYTHON_VERSION}/bin/activate
     fi
   - |
     if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then
-        mkdir $HOME/bin; ln -s $(which pip2) $HOME/bin/pip; ln -s $(which python2) $HOME/bin/python;
         python -m pip install --disable-pip-version-check --upgrade pip
         pip install -U scikit-ci scikit-ci-addons
         ci_addons --install ../addons
diff --git a/pyproject.toml b/pyproject.toml
index f130777..4f974fc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,2 +1,3 @@
 [build-system]
-requires = ["setuptools", "wheel", "scikit-build"]
+requires = ["setuptools>=42", "wheel", "scikit-build", "cmake"]
+build-backend = "setuptools.build_meta"
diff --git a/requirements-dev.txt b/requirements-dev.txt
index fa1c5ad..f192dbf 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -11,3 +11,8 @@ twine
 virtualenv>=15.0.3
 wheel>=0.34
 wheeltools
+
+# need to pin cryptography for manylinux1 builds
+# cryptography only provides manylinux2010 wheels since 3.4.0
+# because of the lack of a decent rust compiler on manylinux1
+cryptography~=3.3.2 ; sys_platform=="linux" and platform_machine in "i386, i486, i586, i686, x86_64"
diff --git a/scikit-ci.yml b/scikit-ci.yml
index b640311..bc21737 100644
--- a/scikit-ci.yml
+++ b/scikit-ci.yml
@@ -19,8 +19,6 @@ before_install:
       environment:
         PATH: $<HOME>/.pyenv/versions/$<PYTHON_VERSION>/bin:$<PATH>
         SETUP_BDIST_WHEEL_ARGS: --plat-name macosx-10.6-x86_64
-      commands:
-        - python ../addons/travis/install_pyenv.py
 
 install:
   commands:
diff --git a/setup.py b/setup.py
index 9765214..4a5d711 100755
--- a/setup.py
+++ b/setup.py
@@ -1,11 +1,17 @@
 #!/usr/bin/env python
 
+import os
 import sys
-import versioneer
 
 from distutils.text_file import TextFile
 from skbuild import setup
 
+# Add current folder to path
+# This is required to import versioneer in an isolated pip build
+sys.path.append(os.path.dirname(os.path.abspath(__file__)))
+
+import versioneer  # noqa: E402
+
 
 with open('README.rst', 'r') as fp:
     readme = fp.read()
diff --git a/versioneer.py b/versioneer.py
index f250cde..1e28dbf 100644
--- a/versioneer.py
+++ b/versioneer.py
@@ -1283,7 +1283,22 @@ def render_pep440_post(pieces):
     if pieces["closest-tag"]:
         rendered = pieces["closest-tag"]
         if pieces["distance"] or pieces["dirty"]:
-            rendered += ".post%d" % pieces["distance"]
+            if ".post" in rendered:
+                # update the existing post tag
+                start = rendered.index(".post") + 5
+                if len(rendered) == start:
+                    rendered += "%d" % pieces["distance"]
+                else:
+                    end = start + 1
+                    while end <= len(rendered) and rendered[start:end].isdigit():
+                        end += 1
+                    end -= 1
+                    distance = pieces["distance"]
+                    if start != end:
+                        distance += int(rendered[start:end])
+                    rendered = rendered[:start] + "%d" % distance + rendered[end:]
+            else:
+                rendered += ".post%d" % pieces["distance"]
             if pieces["dirty"]:
                 rendered += ".dev0"
             rendered += plus_or_dot(pieces)