diff --git a/.azure-pipelines/azure-pipelines-linux.yml b/.azure-pipelines/azure-pipelines-linux.yml
index 3adf3ac..16a1d32 100755
--- a/.azure-pipelines/azure-pipelines-linux.yml
+++ b/.azure-pipelines/azure-pipelines-linux.yml
@@ -11,15 +11,15 @@ jobs:
       linux_64_python3.7.____cpython:
         CONFIG: linux_64_python3.7.____cpython
         UPLOAD_PACKAGES: 'True'
-        DOCKER_IMAGE: quay.io/condaforge/linux-anvil-comp7
+        DOCKER_IMAGE: quay.io/condaforge/linux-anvil-cos7-x86_64
       linux_64_python3.8.____cpython:
         CONFIG: linux_64_python3.8.____cpython
         UPLOAD_PACKAGES: 'True'
-        DOCKER_IMAGE: quay.io/condaforge/linux-anvil-comp7
+        DOCKER_IMAGE: quay.io/condaforge/linux-anvil-cos7-x86_64
       linux_64_python3.9.____cpython:
         CONFIG: linux_64_python3.9.____cpython
         UPLOAD_PACKAGES: 'True'
-        DOCKER_IMAGE: quay.io/condaforge/linux-anvil-comp7
+        DOCKER_IMAGE: quay.io/condaforge/linux-anvil-cos7-x86_64
   timeoutInMinutes: 360
 
   steps:
@@ -40,6 +40,11 @@ jobs:
         export CI=azure
         export GIT_BRANCH=$BUILD_SOURCEBRANCHNAME
         export FEEDSTOCK_NAME=$(basename ${BUILD_REPOSITORY_NAME})
+        if [[ "${BUILD_REASON:-}" == "PullRequest" ]]; then
+          export IS_PR_BUILD="True"
+        else
+          export IS_PR_BUILD="False"
+        fi
         .scripts/run_docker_build.sh
     displayName: Run docker build
     env:
diff --git a/.azure-pipelines/azure-pipelines-osx.yml b/.azure-pipelines/azure-pipelines-osx.yml
index 46f2d97..7c4c40e 100755
--- a/.azure-pipelines/azure-pipelines-osx.yml
+++ b/.azure-pipelines/azure-pipelines-osx.yml
@@ -26,6 +26,11 @@ jobs:
       export OSX_FORCE_SDK_DOWNLOAD="1"
       export GIT_BRANCH=$BUILD_SOURCEBRANCHNAME
       export FEEDSTOCK_NAME=$(basename ${BUILD_REPOSITORY_NAME})
+      if [[ "${BUILD_REASON:-}" == "PullRequest" ]]; then
+        export IS_PR_BUILD="True"
+      else
+        export IS_PR_BUILD="False"
+      fi
       ./.scripts/run_osx_build.sh
     displayName: Run OSX build
     env:
diff --git a/.ci_support/linux_64_python3.7.____cpython.yaml b/.ci_support/linux_64_python3.7.____cpython.yaml
index 0466c6e..9a71c28 100644
--- a/.ci_support/linux_64_python3.7.____cpython.yaml
+++ b/.ci_support/linux_64_python3.7.____cpython.yaml
@@ -1,3 +1,7 @@
+c_compiler:
+- gcc
+c_compiler_version:
+- '9'
 cdt_name:
 - cos6
 channel_sources:
@@ -9,7 +13,7 @@ cxx_compiler:
 cxx_compiler_version:
 - '9'
 docker_image:
-- quay.io/condaforge/linux-anvil-comp7
+- quay.io/condaforge/linux-anvil-cos7-x86_64
 pin_run_as_build:
   python:
     min_pin: x.x
@@ -19,5 +23,5 @@ python:
 target_platform:
 - linux-64
 zip_keys:
-- - cdt_name
-  - docker_image
+- - c_compiler_version
+  - cxx_compiler_version
diff --git a/.ci_support/linux_64_python3.8.____cpython.yaml b/.ci_support/linux_64_python3.8.____cpython.yaml
index 6271a43..ac26fa9 100644
--- a/.ci_support/linux_64_python3.8.____cpython.yaml
+++ b/.ci_support/linux_64_python3.8.____cpython.yaml
@@ -1,3 +1,7 @@
+c_compiler:
+- gcc
+c_compiler_version:
+- '9'
 cdt_name:
 - cos6
 channel_sources:
@@ -9,7 +13,7 @@ cxx_compiler:
 cxx_compiler_version:
 - '9'
 docker_image:
-- quay.io/condaforge/linux-anvil-comp7
+- quay.io/condaforge/linux-anvil-cos7-x86_64
 pin_run_as_build:
   python:
     min_pin: x.x
@@ -19,5 +23,5 @@ python:
 target_platform:
 - linux-64
 zip_keys:
-- - cdt_name
-  - docker_image
+- - c_compiler_version
+  - cxx_compiler_version
diff --git a/.ci_support/linux_64_python3.9.____cpython.yaml b/.ci_support/linux_64_python3.9.____cpython.yaml
index c7eca7b..cedba7d 100644
--- a/.ci_support/linux_64_python3.9.____cpython.yaml
+++ b/.ci_support/linux_64_python3.9.____cpython.yaml
@@ -1,3 +1,7 @@
+c_compiler:
+- gcc
+c_compiler_version:
+- '9'
 cdt_name:
 - cos6
 channel_sources:
@@ -9,7 +13,7 @@ cxx_compiler:
 cxx_compiler_version:
 - '9'
 docker_image:
-- quay.io/condaforge/linux-anvil-comp7
+- quay.io/condaforge/linux-anvil-cos7-x86_64
 pin_run_as_build:
   python:
     min_pin: x.x
@@ -19,5 +23,5 @@ python:
 target_platform:
 - linux-64
 zip_keys:
-- - cdt_name
-  - docker_image
+- - c_compiler_version
+  - cxx_compiler_version
diff --git a/.ci_support/osx_64_python3.7.____cpython.yaml b/.ci_support/osx_64_python3.7.____cpython.yaml
index 7a5221d..8ac9847 100644
--- a/.ci_support/osx_64_python3.7.____cpython.yaml
+++ b/.ci_support/osx_64_python3.7.____cpython.yaml
@@ -1,5 +1,9 @@
 MACOSX_DEPLOYMENT_TARGET:
 - '10.9'
+c_compiler:
+- clang
+c_compiler_version:
+- '11'
 channel_sources:
 - conda-forge
 channel_targets:
@@ -18,3 +22,6 @@ python:
 - 3.7.* *_cpython
 target_platform:
 - osx-64
+zip_keys:
+- - c_compiler_version
+  - cxx_compiler_version
diff --git a/.ci_support/osx_64_python3.8.____cpython.yaml b/.ci_support/osx_64_python3.8.____cpython.yaml
index 45fc72b..adc468f 100644
--- a/.ci_support/osx_64_python3.8.____cpython.yaml
+++ b/.ci_support/osx_64_python3.8.____cpython.yaml
@@ -1,5 +1,9 @@
 MACOSX_DEPLOYMENT_TARGET:
 - '10.9'
+c_compiler:
+- clang
+c_compiler_version:
+- '11'
 channel_sources:
 - conda-forge
 channel_targets:
@@ -18,3 +22,6 @@ python:
 - 3.8.* *_cpython
 target_platform:
 - osx-64
+zip_keys:
+- - c_compiler_version
+  - cxx_compiler_version
diff --git a/.ci_support/osx_64_python3.9.____cpython.yaml b/.ci_support/osx_64_python3.9.____cpython.yaml
index fbbd469..0401309 100644
--- a/.ci_support/osx_64_python3.9.____cpython.yaml
+++ b/.ci_support/osx_64_python3.9.____cpython.yaml
@@ -1,5 +1,9 @@
 MACOSX_DEPLOYMENT_TARGET:
 - '10.9'
+c_compiler:
+- clang
+c_compiler_version:
+- '11'
 channel_sources:
 - conda-forge
 channel_targets:
@@ -18,3 +22,6 @@ python:
 - 3.9.* *_cpython
 target_platform:
 - osx-64
+zip_keys:
+- - c_compiler_version
+  - cxx_compiler_version
diff --git a/.gitattributes b/.gitattributes
index 9060b27..ce52713 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -18,6 +18,7 @@ bld.bat text eol=crlf
 .gitignore linguist-generated=true
 .travis.yml linguist-generated=true
 .scripts/* linguist-generated=true
+.woodpecker.yml linguist-generated=true
 LICENSE.txt linguist-generated=true
 README.md linguist-generated=true
 azure-pipelines.yml linguist-generated=true
diff --git a/.scripts/build_steps.sh b/.scripts/build_steps.sh
index 71a0686..ff01283 100755
--- a/.scripts/build_steps.sh
+++ b/.scripts/build_steps.sh
@@ -5,6 +5,8 @@
 # changes to this script, consider a proposal to conda-smithy so that other feedstocks can also
 # benefit from the improvement.
 
+# -*- mode: jinja-shell -*-
+
 set -xeuo pipefail
 export FEEDSTOCK_ROOT="${FEEDSTOCK_ROOT:-/home/conda/feedstock_root}"
 source ${FEEDSTOCK_ROOT}/.scripts/logging_utils.sh
@@ -25,9 +27,10 @@ conda-build:
  root-dir: ${FEEDSTOCK_ROOT}/build_artifacts
 
 CONDARC
-BUILD_CMD=build
 
-conda install --yes --quiet "conda-forge-ci-setup=3" conda-build pip ${GET_BOA:-} -c conda-forge
+
+mamba install --update-specs --yes --quiet "conda-forge-ci-setup=3" conda-build pip boa -c conda-forge
+mamba update --update-specs --yes --quiet "conda-forge-ci-setup=3" conda-build pip boa -c conda-forge
 
 # set up the condarc
 setup_conda_rc "${FEEDSTOCK_ROOT}" "${RECIPE_ROOT}" "${CONFIG_FILE}"
@@ -38,6 +41,7 @@ source run_conda_forge_build_setup
 make_build_number "${FEEDSTOCK_ROOT}" "${RECIPE_ROOT}" "${CONFIG_FILE}"
 
 
+
 ( endgroup "Configuring conda" ) 2> /dev/null
 
 if [[ "${BUILD_WITH_CONDA_DEBUG:-0}" == 1 ]]; then
@@ -51,7 +55,7 @@ if [[ "${BUILD_WITH_CONDA_DEBUG:-0}" == 1 ]]; then
     # Drop into an interactive shell
     /bin/bash
 else
-    conda $BUILD_CMD "${RECIPE_ROOT}" -m "${CI_SUPPORT}/${CONFIG}.yaml" \
+    conda mambabuild "${RECIPE_ROOT}" -m "${CI_SUPPORT}/${CONFIG}.yaml" \
         --suppress-variables ${EXTRA_CB_OPTIONS:-} \
         --clobber-file "${CI_SUPPORT}/clobber_${CONFIG}.yaml"
     ( startgroup "Validating outputs" ) 2> /dev/null
@@ -62,7 +66,7 @@ else
 
     ( startgroup "Uploading packages" ) 2> /dev/null
 
-    if [[ "${UPLOAD_PACKAGES}" != "False" ]]; then
+    if [[ "${UPLOAD_PACKAGES}" != "False" ]] && [[ "${IS_PR_BUILD}" == "False" ]]; then
         upload_package --validate --feedstock-name="${FEEDSTOCK_NAME}"  "${FEEDSTOCK_ROOT}" "${RECIPE_ROOT}" "${CONFIG_FILE}"
     fi
 
diff --git a/.scripts/run_docker_build.sh b/.scripts/run_docker_build.sh
index 244ccd1..0c6515f 100755
--- a/.scripts/run_docker_build.sh
+++ b/.scripts/run_docker_build.sh
@@ -75,12 +75,15 @@ fi
 ( startgroup "Start Docker" ) 2> /dev/null
 
 export UPLOAD_PACKAGES="${UPLOAD_PACKAGES:-True}"
+export IS_PR_BUILD="${IS_PR_BUILD:-False}"
+docker pull "${DOCKER_IMAGE}"
 docker run ${DOCKER_RUN_ARGS} \
            -v "${RECIPE_ROOT}":/home/conda/recipe_root:rw,z,delegated \
            -v "${FEEDSTOCK_ROOT}":/home/conda/feedstock_root:rw,z,delegated \
            -e CONFIG \
            -e HOST_USER_ID \
            -e UPLOAD_PACKAGES \
+           -e IS_PR_BUILD \
            -e GIT_BRANCH \
            -e UPLOAD_ON_BRANCH \
            -e CI \
@@ -91,9 +94,9 @@ docker run ${DOCKER_RUN_ARGS} \
            -e BINSTAR_TOKEN \
            -e FEEDSTOCK_TOKEN \
            -e STAGING_BINSTAR_TOKEN \
-           $DOCKER_IMAGE \
+           "${DOCKER_IMAGE}" \
            bash \
-           /home/conda/feedstock_root/${PROVIDER_DIR}/build_steps.sh
+           "/home/conda/feedstock_root/${PROVIDER_DIR}/build_steps.sh"
 
 # verify that the end of the script was reached
 test -f "$DONE_CANARY"
diff --git a/.scripts/run_osx_build.sh b/.scripts/run_osx_build.sh
index 96d0278..d10e0c2 100755
--- a/.scripts/run_osx_build.sh
+++ b/.scripts/run_osx_build.sh
@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+# -*- mode: jinja-shell -*-
+
 source .scripts/logging_utils.sh
 
 set -xe
@@ -9,21 +11,21 @@ MINIFORGE_HOME=${MINIFORGE_HOME:-${HOME}/miniforge3}
 ( startgroup "Installing a fresh version of Miniforge" ) 2> /dev/null
 
 MINIFORGE_URL="https://github.com/conda-forge/miniforge/releases/latest/download"
-MINIFORGE_FILE="Miniforge3-MacOSX-x86_64.sh"
+MINIFORGE_FILE="Mambaforge-MacOSX-$(uname -m).sh"
 curl -L -O "${MINIFORGE_URL}/${MINIFORGE_FILE}"
+rm -rf ${MINIFORGE_HOME}
 bash $MINIFORGE_FILE -b -p ${MINIFORGE_HOME}
 
 ( endgroup "Installing a fresh version of Miniforge" ) 2> /dev/null
 
 ( startgroup "Configuring conda" ) 2> /dev/null
 
-BUILD_CMD=build
-
 source ${MINIFORGE_HOME}/etc/profile.d/conda.sh
 conda activate base
 
 echo -e "\n\nInstalling conda-forge-ci-setup=3 and conda-build."
-conda install -n base --quiet --yes "conda-forge-ci-setup=3" conda-build pip ${GET_BOA:-}
+mamba install -n base --update-specs --quiet --yes "conda-forge-ci-setup=3" conda-build pip boa
+mamba update -n base --update-specs --quiet --yes "conda-forge-ci-setup=3" conda-build pip boa
 
 
 
@@ -53,7 +55,7 @@ source run_conda_forge_build_setup
 echo -e "\n\nMaking the build clobber file"
 make_build_number ./ ./recipe ./.ci_support/${CONFIG}.yaml
 
-conda $BUILD_CMD ./recipe -m ./.ci_support/${CONFIG}.yaml --suppress-variables --clobber-file ./.ci_support/clobber_${CONFIG}.yaml ${EXTRA_CB_OPTIONS:-}
+conda mambabuild ./recipe -m ./.ci_support/${CONFIG}.yaml --suppress-variables --clobber-file ./.ci_support/clobber_${CONFIG}.yaml ${EXTRA_CB_OPTIONS:-}
 ( startgroup "Validating outputs" ) 2> /dev/null
 
 validate_recipe_outputs "${FEEDSTOCK_NAME}"
@@ -62,7 +64,7 @@ validate_recipe_outputs "${FEEDSTOCK_NAME}"
 
 ( startgroup "Uploading packages" ) 2> /dev/null
 
-if [[ "${UPLOAD_PACKAGES}" != "False" ]]; then
+if [[ "${UPLOAD_PACKAGES}" != "False" ]] && [[ "${IS_PR_BUILD}" == "False" ]]; then
   upload_package --validate --feedstock-name="${FEEDSTOCK_NAME}" ./ ./recipe ./.ci_support/${CONFIG}.yaml
 fi
 
diff --git a/LICENSE.txt b/LICENSE.txt
index ed3f451..6ec1401 100644
--- a/LICENSE.txt
+++ b/LICENSE.txt
@@ -1,5 +1,5 @@
 BSD 3-clause license
-Copyright (c) 2015-2021, conda-forge contributors
+Copyright (c) 2015-2022, conda-forge contributors
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
diff --git a/README.md b/README.md
index 5c4feab..4876acc 100644
--- a/README.md
+++ b/README.md
@@ -111,7 +111,8 @@ conda search libsemigroups_pybind11 --channel conda-forge
 About conda-forge
 =================
 
-[![Powered by NumFOCUS](https://img.shields.io/badge/powered%20by-NumFOCUS-orange.svg?style=flat&colorA=E1523D&colorB=007D8A)](http://numfocus.org)
+[![Powered by
+NumFOCUS](https://img.shields.io/badge/powered%20by-NumFOCUS-orange.svg?style=flat&colorA=E1523D&colorB=007D8A)](https://numfocus.org)
 
 conda-forge is a community-led conda channel of installable packages.
 In order to provide high-quality builds, the process has been automated into the
diff --git a/build-locally.py b/build-locally.py
index 00eeb34..8b74348 100755
--- a/build-locally.py
+++ b/build-locally.py
@@ -13,6 +13,7 @@
 def setup_environment(ns):
     os.environ["CONFIG"] = ns.config
     os.environ["UPLOAD_PACKAGES"] = "False"
+    os.environ["IS_PR_BUILD"] = "True"
     if ns.debug:
         os.environ["BUILD_WITH_CONDA_DEBUG"] = "1"
         if ns.output_id:
@@ -21,6 +22,10 @@ def setup_environment(ns):
         os.environ["MINIFORGE_HOME"] = os.path.join(
             os.path.dirname(__file__), "miniforge3"
         )
+    if "OSX_SDK_DIR" not in os.environ:
+        os.environ["OSX_SDK_DIR"] = os.path.join(
+            os.path.dirname(__file__), "SDKs"
+        )
 
 
 def run_docker_build(ns):
diff --git a/recipe/meta.yaml b/recipe/meta.yaml
index 925e1c9..a1fce08 100644
--- a/recipe/meta.yaml
+++ b/recipe/meta.yaml
@@ -1,5 +1,5 @@
 {% set name = "libsemigroups_pybind11" %}
-{% set version = "0.1.1" %}
+{% set version = "0.1.5" %}
 
 package:
   name: libsemigroups_pybind11
@@ -7,7 +7,7 @@ package:
 
 source:
   url: https://github.com/libsemigroups/libsemigroups_pybind11/archive/refs/tags/v{{ version }}.tar.gz
-  sha256: a51878de09443d9e632a0c502aaa47b314a54ee793731c20f1874896890dfecb
+  sha256: c1d931d128439f851cb731cce6e55d2240aa9cf8a1a92599d48b83d287f8b882
 
 build:
   number: 0
@@ -16,7 +16,9 @@ build:
 
 requirements:
   build:
+    - {{ compiler('c') }}
     - {{ compiler('cxx') }}
+    - pkg-config
   host:
     - python
     - pip
@@ -24,6 +26,7 @@ requirements:
     - pkgconfig >=0.29.2
     - packaging >=20.4
     - pybind11 >=2.6
+    - eigen
   run:
     - python
     - libsemigroups >=2.0.2
@@ -32,19 +35,15 @@ requirements:
 test:
   imports:
     - libsemigroups_pybind11
-  requires:
-    - pytest=6.2.4
-  source_files:
-    - tests/
   commands:
-    - pytest -vv tests/test_*.py
+    - pip check
 
 about:
   home: https://libsemigroups.github.io/
   license: GPL-3.0-or-later
   license_family: GPL
   license_file: LICENSE
-  summary: 'Python package for using the C++ library libsemigroups via pybind11'
+  summary: Python package for using the C++ library libsemigroups via pybind11
   dev_url: https://github.com/libsemigroups/libsemigroups_pybind11
 
 extra: