diff --git a/setup.py b/setup.py
index 027382180cf42707480b4cec272706a254d6d0ab..98241ecec62db742761674f8887a13bcc4cea977 100644
--- a/setup.py
+++ b/setup.py
@@ -13,7 +13,7 @@ setup(
     install_requires=[
         'gdal>=2',
         'pvl',
-        'protobuf=3.0.0b2',
+        'protobuf==3.0.0b2',
         'h5py',
         'pandas',
         'sqlalchemy',