diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 1d27a579e..979833b9d 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -4,6 +4,9 @@ CHANGELOG
 6.0.0b6 (unreleased)
 --------------------
 
+- Use pendulum's parser to deserialize datetime values (if it's installed).
+  Otherwise use current one. [masipcat]
+
 - Undo datetime object renderization on
   guillotina_json_default. [lferran]
 
diff --git a/guillotina/json/deserialize_value.py b/guillotina/json/deserialize_value.py
index beecaae80..9d1e92db9 100644
--- a/guillotina/json/deserialize_value.py
+++ b/guillotina/json/deserialize_value.py
@@ -1,5 +1,16 @@
 # -*- coding: utf-8 -*-
-from dateutil.parser import parse
+
+try:
+    # Pendulum's parser is faster than dateutil.parser for dates with format
+    # RFC 3339/ISO 8601. See GH issue #974 for details.
+    from pendulum.parsing import parse as _parse
+    from functools import partial
+
+    # When parse is called with `strict=False` it calls dateutil.parse() as fallback
+    parse = partial(_parse, strict=False)
+except ImportError:
+    from dateutil.parser import parse
+
 from guillotina import configure
 from guillotina.component import ComponentLookupError
 from guillotina.component import get_adapter