diff --git a/requirements/constraints.txt b/requirements/constraints.txt
index 2067594cea..61b3289a98 100644
--- a/requirements/constraints.txt
+++ b/requirements/constraints.txt
@@ -31,6 +31,9 @@ drf-yasg==1.16
 # acceptance.tests.lms.test_lms_course_discovery.CourseDiscoveryTest.test_search
 edx-search==1.2.2
 
+# Version 0.3.13 broke the timing returned by python3-saml OneLogin_Saml2_Utils.now()
+freezegun==0.3.12
+
 # 4.0.0 dropped support for Python 3.5
 inflect<4.0.0