diff --git a/sphinx_json_schema/compat.py b/sphinx_json_schema/compat.py
new file mode 100644
index 0000000..26eed00
--- /dev/null
+++ b/sphinx_json_schema/compat.py
@@ -0,0 +1,7 @@
+
+try:
+    # Python >= 3.8
+    from collections.abc import Mapping
+except ImportError:
+    # Python < 3.8
+    from collections import Mapping
diff --git a/sphinx_json_schema/mergers.py b/sphinx_json_schema/mergers.py
index dd68abd..718550c 100644
--- a/sphinx_json_schema/mergers.py
+++ b/sphinx_json_schema/mergers.py
@@ -2,8 +2,7 @@
 JSON schema loader helpers
 """
 
-from collections import Mapping
-from copy import deepcopy
+from .compat import Mapping
 
 
 def merge(base, to_merge, mode):