diff --git a/src/humulus/_version.py b/src/humulus/_version.py
index 0926597..d7c2416 100644
--- a/src/humulus/_version.py
+++ b/src/humulus/_version.py
@@ -12,9 +12,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import os
-
 __version__ = "0.0.1"
-
-if os.environ.get("DRONE_BUILD_NUMBER", default=None) is not None:
-    __version__ += "dev{}".format(os.environ["DRONE_BUILD_NUMBER"])