diff --git a/aws_lambda_builders/__init__.py b/aws_lambda_builders/__init__.py
index f38463afc..f9b942ea8 100644
--- a/aws_lambda_builders/__init__.py
+++ b/aws_lambda_builders/__init__.py
@@ -1,5 +1,5 @@
 """
 AWS Lambda Builder Library
 """
-__version__ = '0.0.2'
+__version__ = '0.0.3-dev'
 RPC_PROTOCOL_VERSION = "0.1"
diff --git a/aws_lambda_builders/workflows/python_pip/packager.py b/aws_lambda_builders/workflows/python_pip/packager.py
index d9c78cd74..9cda81084 100644
--- a/aws_lambda_builders/workflows/python_pip/packager.py
+++ b/aws_lambda_builders/workflows/python_pip/packager.py
@@ -5,6 +5,7 @@
 import sys
 import re
 import subprocess
+import logging
 from email.parser import FeedParser
 
 
@@ -14,6 +15,8 @@
 from .compat import pip_no_compile_c_shim
 from .utils import OSUtils
 
+LOG = logging.getLogger(__name__)
+
 
 # TODO update the wording here
 MISSING_DEPENDENCIES_TEMPLATE = r"""
@@ -229,6 +232,9 @@ def _download_dependencies(self, directory, requirements_filename):
                 else:
                     incompatible_wheels.add(package)
 
+        LOG.debug("initial compatible: %s", compatible_wheels)
+        LOG.debug("initial incompatible: %s", incompatible_wheels | sdists)
+
         # Next we need to go through the downloaded packages and pick out any
         # dependencies that do not have a compatible wheel file downloaded.
         # For these packages we need to explicitly try to download a
@@ -242,6 +248,10 @@ def _download_dependencies(self, directory, requirements_filename):
         # file ourselves.
         compatible_wheels, incompatible_wheels = self._categorize_wheel_files(
             directory)
+        LOG.debug(
+            "compatible wheels after second download pass: %s",
+            compatible_wheels
+        )
         missing_wheels = sdists - compatible_wheels
         self._build_sdists(missing_wheels, directory, compile_c=True)
 
@@ -255,6 +265,10 @@ def _download_dependencies(self, directory, requirements_filename):
         # compiler.
         compatible_wheels, incompatible_wheels = self._categorize_wheel_files(
             directory)
+        LOG.debug(
+            "compatible after building wheels (no C compiling): %s",
+            compatible_wheels
+        )
         missing_wheels = sdists - compatible_wheels
         self._build_sdists(missing_wheels, directory, compile_c=False)
 
@@ -264,6 +278,10 @@ def _download_dependencies(self, directory, requirements_filename):
         # compatible version directly and building from source.
         compatible_wheels, incompatible_wheels = self._categorize_wheel_files(
             directory)
+        LOG.debug(
+            "compatible after building wheels (C compiling): %s",
+            compatible_wheels
+        )
 
         # Now there is still the case left over where the setup.py has been
         # made in such a way to be incompatible with python's setup tools,
@@ -273,6 +291,9 @@ def _download_dependencies(self, directory, requirements_filename):
         compatible_wheels, incompatible_wheels = self._apply_wheel_whitelist(
             compatible_wheels, incompatible_wheels)
         missing_wheels = deps - compatible_wheels
+        LOG.debug("Final compatible: %s", compatible_wheels)
+        LOG.debug("Final incompatible: %s", incompatible_wheels)
+        LOG.debug("Final missing wheels: %s", missing_wheels)
 
         return compatible_wheels, missing_wheels
 
@@ -285,14 +306,18 @@ def _download_all_dependencies(self, requirements_filename, directory):
         self._pip.download_all_dependencies(requirements_filename, directory)
         deps = {Package(directory, filename) for filename
                 in self._osutils.get_directory_contents(directory)}
+        LOG.debug("Full dependency closure: %s", deps)
         return deps
 
     def _download_binary_wheels(self, packages, directory):
         # Try to get binary wheels for each package that isn't compatible.
+        LOG.debug("Downloading missing wheels: %s", packages)
         self._pip.download_manylinux_wheels(
             [pkg.identifier for pkg in packages], directory)
 
     def _build_sdists(self, sdists, directory, compile_c=True):
+        LOG.debug("Build missing wheels from sdists "
+                  "(C compiling %s): %s", compile_c, sdists)
         for sdist in sdists:
             path_to_sdist = self._osutils.joinpath(directory, sdist.filename)
             self._pip.build_wheel(path_to_sdist, directory, compile_c)
@@ -537,6 +562,7 @@ def __init__(self, pip, osutils=None):
     def _execute(self, command, args, env_vars=None, shim=None):
         """Execute a pip command with the given arguments."""
         main_args = [command] + args
+        LOG.debug("calling pip %s", ' '.join(main_args))
         rc, out, err = self._wrapped_pip.main(main_args, env_vars=env_vars,
                                               shim=shim)
         return rc, out, err