diff --git a/.gitignore b/.gitignore
index bd46701a1..18c93971f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,3 +8,4 @@ __pycache__/
 *.egg-info/
 *.egg
 dist/
+*.whl
diff --git a/Cargo.lock b/Cargo.lock
index fa4d72b53..edb7989f0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1108,7 +1108,7 @@ dependencies = [
 
 [[package]]
 name = "pyo3-pack"
-version = "0.7.0-beta.1"
+version = "0.7.0-beta.2"
 dependencies = [
  "base64 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "cargo_metadata 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/Cargo.toml b/Cargo.toml
index 74978d744..7400b4735 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 authors = ["konstin <konstin@mailbox.org>"]
 name = "pyo3-pack"
-version = "0.7.0-beta.1"
+version = "0.7.0-beta.2"
 description = "Build and publish crates with pyo3, rust-cpython and cffi bindings as well as rust binaries as python packages"
 exclude = ["test-crates/**/*", "integration-test/**/*", "sysconfig/*", "test-data/*"]
 readme = "Readme.md"
diff --git a/pyo3_pack/__init__.py b/pyo3_pack/__init__.py
index 5f5cc39c5..97a7c9227 100644
--- a/pyo3_pack/__init__.py
+++ b/pyo3_pack/__init__.py
@@ -53,7 +53,7 @@ def build_wheel(wheel_directory, config_settings=None, metadata_directory=None):
 
     print("Running `{}`".format(" ".join(command)))
     try:
-        output = subprocess.check_output(command, universal_newlines=True)
+        output = subprocess.check_output(command).decode("utf-8", "ignore")
     except subprocess.CalledProcessError as e:
         print("Error: {}".format(e))
         sys.exit(1)
@@ -77,7 +77,7 @@ def build_sdist(sdist_directory, config_settings=None):
 
     print("Running `{}`".format(" ".join(command)))
     try:
-        output = subprocess.check_output(command, universal_newlines=True)
+        output = subprocess.check_output(command).decode("utf-8", "ignore")
     except subprocess.CalledProcessError as e:
         print(e)
         sys.exit(1)
@@ -110,6 +110,6 @@ def prepare_metadata_for_build_wheel(metadata_directory, config_settings=None):
     command.extend(get_config_options())
 
     print("Running `{}`".format(" ".join(command)))
-    output = subprocess.check_output(command, universal_newlines=True)
+    output = subprocess.check_output(command).decode("utf-8", "ignore")
     print(output)
     return output.strip().splitlines()[-1]