Fix pylint in tox

Change-Id: Ifef8f7516df33e48d6df8e38414fe96a3ad30e73
Signed-off-by: David Garcia <david.garcia@canonical.com>
diff --git a/tox.ini b/tox.ini
index a0f0503..2ca433c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -34,7 +34,7 @@
 [testenv:pylint]
 basepython = python3
 deps =
-  pylint
+  pylint==2.5.3
   -rrequirements.txt
 commands =
   pylint -E n2vc --ignore=tests
@@ -42,7 +42,7 @@
 [testenv:pylint-tests]
 basepython = python3
 deps =
-  pylint
+  pylint==2.5.3
   -rrequirements.txt
   -rtest-requirements.txt
 commands =