diff --git a/.github/workflows/build.sh b/.github/workflows/build.sh
index e0981c484..c8a892b0f 100755
--- a/.github/workflows/build.sh
+++ b/.github/workflows/build.sh
@@ -24,7 +24,7 @@ echo "::group::Install a virtualenv"
   source multibuild/travis_steps.sh
   # can't use default 7.3.1 on macOS due to https://foss.heptapod.net/pypy/pypy/-/issues/3229
   LATEST_PP_7p3=7.3.2
-  pip install virtualenv
+  python3 -m pip install virtualenv
   before_install
 echo "::endgroup::"
 
diff --git a/config.sh b/config.sh
index c5d6326aa..8fefca11b 100644
--- a/config.sh
+++ b/config.sh
@@ -85,7 +85,7 @@ function run_tests {
         brew install openblas
         echo -e "[openblas]\nlibraries = openblas\nlibrary_dirs = /usr/local/opt/openblas/lib" >> ~/.numpy-site.cfg
     fi
-    pip install numpy
+    python3 -m pip install numpy
 
     mv ../pillow-depends-master/test_images/* ../Pillow/Tests/images