diff --git a/examples/helloworld/BUILD b/examples/helloworld/BUILD
index 43ac6c12da..1e1a749adb 100644
--- a/examples/helloworld/BUILD
+++ b/examples/helloworld/BUILD
@@ -28,5 +28,5 @@ py_test(
     name = "helloworld_test",
     srcs = ["helloworld_test.py"],
     deps = [":helloworld"],
-    python_version = "PY2",
+    python_version = "PY3",
 )
diff --git a/packaging/piptool.py b/packaging/piptool.py
index 2544032ee8..d5aaf7896f 100644
--- a/packaging/piptool.py
+++ b/packaging/piptool.py
@@ -78,7 +78,7 @@ def pip_main(argv):
     atexit.register(lambda: shutil.rmtree(cert_tmpdir, ignore_errors=True))
     with open(cert_path, "wb") as cert:
       cert.write(pkgutil.get_data("pip._vendor.requests", "cacert.pem"))
-    argv = ["--isolated", "--disable-pip-version-check", "--cert", cert_path] + argv
+    argv = ["--isolated", "--python-version=37", "--disable-pip-version-check", "--cert", cert_path] + argv
     return pip.main(argv)
 
 from packaging.whl import Wheel
diff --git a/packaging/whl.py b/packaging/whl.py
index 63a6d62b8f..3ed6e87ebe 100644
--- a/packaging/whl.py
+++ b/packaging/whl.py
@@ -149,6 +149,7 @@ def main():
     name = "pkg",
     srcs = glob(["**/*.py"]),
     data = glob(["**/*"], exclude=["**/*.py", "**/* *", "BUILD", "WORKSPACE"]),
+    python_version = "PY3",
     # This makes this directory a top-level in the python import
     # search path for anything that depends on this.
     imports = ["."],
@@ -163,6 +164,7 @@ def main():
   extras='\n\n'.join([
     """py_library(
     name = "{extra}",
+    python_version = "PY3",
     deps = [
         ":pkg",{deps}
     ],
diff --git a/python/pip.bzl b/python/pip.bzl
index b69eb9366e..3ae33aa06a 100644
--- a/python/pip.bzl
+++ b/python/pip.bzl
@@ -24,7 +24,7 @@ def _pip_import_impl(repository_ctx):
 
     # To see the output, pass: quiet=False
     result = repository_ctx.execute([
-        "python",
+        "python3.7",
         repository_ctx.path(repository_ctx.attr._script),
         "--name",
         repository_ctx.attr.name,
diff --git a/python/whl.bzl b/python/whl.bzl
index 3f869c29ec..4b7f8b259e 100644
--- a/python/whl.bzl
+++ b/python/whl.bzl
@@ -17,7 +17,7 @@ def _whl_impl(repository_ctx):
     """Core implementation of whl_library."""
 
     args = [
-        "python",
+        "python3.7",
         repository_ctx.path(repository_ctx.attr._script),
         "--whl",
         repository_ctx.path(repository_ctx.attr.whl),