diff --git a/pbc_client/__init__.py b/pbc_client/__init__.py
index ddcdd5b..4833b42 100644
--- a/pbc_client/__init__.py
+++ b/pbc_client/__init__.py
@@ -25,7 +25,7 @@ from frozendict import frozendict
 from .pbc_types import (Address, Signature, HashSha256, Transaction,
 SignedTransaction, SignedTransactionInnerPart)
 
-from _version import __version__ #noqa: F401
+from ._version import __version__ #noqa: F401
 
 logger = logging.getLogger(__name__)
 
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..7513522
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1 @@
+python-ecdsa
diff --git a/test/test_init.py b/test/test_init.py
new file mode 100644
index 0000000..95640db
--- /dev/null
+++ b/test/test_init.py
@@ -0,0 +1,2 @@
+def test_init():
+    import pbc_client #noqa: F401