diff --git a/inspire_json_merger/postprocess.py b/inspire_json_merger/postprocess.py
index 7bdf9a2..79b1d68 100644
--- a/inspire_json_merger/postprocess.py
+++ b/inspire_json_merger/postprocess.py
@@ -23,7 +23,11 @@
 
 import itertools
 import json
-from collections import Iterable
+
+try:
+    from collections.abc import Iterable
+except ImportError:
+    from collections import Iterable
 
 from json_merger.conflict import Conflict
 from pyrsistent import thaw
diff --git a/setup.py b/setup.py
index 4f48cca..1e51bc0 100644
--- a/setup.py
+++ b/setup.py
@@ -50,8 +50,9 @@
     'decorator~=4.0,>=4.1.2',
     'flake8-future-import~=0.0,>=0.4.3',
     'mock~=2.0,>=2.0.0',
-    'pytest-cov~=2.0,>=2.6.1',
-    'pytest~=3.0,>=3.6.0',
+    'pytest-cov~=2.0,>=2.5.1',
+    'pytest~=4.0,>=4.6.0;python_version <= "2.7"',
+    'pytest~=8.0,>=8.0.2;python_version >= "3.6"',
 ]
 
 extras_require = {