Pin juju version to 2.8.1

Change-Id: Id40b3eeb698939131faf56fe008be335e6398cef
Signed-off-by: David Garcia <david.garcia@canonical.com>
diff --git a/requirements.txt b/requirements.txt
index a71d369..8cd901a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,6 +13,6 @@
 #     limitations under the License.
 
 git+https://osm.etsi.org/gerrit/osm/common.git#egg=osm-common
-juju
+juju==2.8.1
 paramiko
 pyasn1>=0.4.4
\ No newline at end of file
diff --git a/setup.py b/setup.py
index 6c8d361..96593ba 100644
--- a/setup.py
+++ b/setup.py
@@ -23,7 +23,7 @@
     packages=find_packages(
         exclude=["*.tests", "*.tests.*", "tests.*", "tests"]),
     install_requires=[
-        'juju',
+        'juju==2.8.1',
         'paramiko',
         'pyasn1>=0.4.4',
     ],