diff --git a/requirements.txt b/requirements.txt
index e85772461c25360a61f2f3f06fc8b43cba1b86e7..7b049aeffe72b5a35f68fbd84b56ac3f5cdade7a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -34,6 +34,9 @@ service_identity==17.0.0
 simplejson==3.15.0
 Sphinx==1.7.0
 twilio==6.10.3
+# Updating pyparsing to 2.4.0 breaks queries like
+#   created: yesterday .. now
+pyparsing==2.3.1
 pytest-cov==2.6.1
 pytest-django==3.4.8
 pytz==2018.9