diff --git a/CHANGELOG.md b/CHANGELOG.md
index 05ab56b..c667623 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 
 - Use `publixsuffix2` (closes issue #4)
 - Add Elasticsearch to automated testing
+- Lock `elasticsearch-dsl` required version to `6.2.1` (closes issue #25)
 
 
 5.0.0
diff --git a/requirements.txt b/requirements.txt
index 998d1b8..4a15041 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,7 +10,7 @@ imapclient
 mail-parser
 dateparser
 elasticsearch>=6.3.0,<7.0.0
-elasticsearch-dsl>=6.2.1,<7.0.0
+elasticsearch-dsl==6.2.1
 kafka-python
 flake8
 sphinx
diff --git a/setup.py b/setup.py
index 1009cc2..20b3cd2 100644
--- a/setup.py
+++ b/setup.py
@@ -96,7 +96,7 @@ setup(
                       'xmltodict', 'geoip2', 'urllib3<1.24,>=1.21.1',
                       'requests', 'imapclient', 'mail-parser', 'dateparser',
                       'elasticsearch>=6.3.0,<7.0.0',
-                      'elasticsearch-dsl>=6.2.1,<7.0.0', 'kafka-python'
+                      'elasticsearch-dsl==6.2.1', 'kafka-python'
                       ],
 
     entry_points={