diff --git a/requirements/constraints.txt b/requirements/constraints.txt
index 42c506925b..2067594cea 100644
--- a/requirements/constraints.txt
+++ b/requirements/constraints.txt
@@ -70,3 +70,6 @@ python3-saml==1.5.0
 # transifex-client 0.13.5 and 0.13.6 pin six and urllib3 to old versions needlessly
 #   https://github.com/transifex/transifex-client/issues/252
 transifex-client==0.13.4
+
+# freezegun 0.3.13 is breaking a test: https://github.com/spulec/freezegun/issues/326
+freezegun==0.3.12
diff --git a/requirements/edx/development.txt b/requirements/edx/development.txt
index d714f2e5f5..783fa3b771 100644
--- a/requirements/edx/development.txt
+++ b/requirements/edx/development.txt
@@ -148,7 +148,7 @@ faker==4.0.0
 filelock==3.0.12
 flake8-polyfill==1.0.2
 flake8==3.7.9
-freezegun==0.3.13
+freezegun==0.3.12
 fs-s3fs==0.1.8
 fs==2.0.18
 future==0.18.2
diff --git a/requirements/edx/testing.txt b/requirements/edx/testing.txt
index 06248a02d8..7ad142e5fd 100644
--- a/requirements/edx/testing.txt
+++ b/requirements/edx/testing.txt
@@ -144,7 +144,7 @@ faker==4.0.0              # via factory-boy
 filelock==3.0.12          # via tox
 flake8-polyfill==1.0.2    # via radon
 flake8==3.7.9             # via flake8-polyfill
-freezegun==0.3.13
+freezegun==0.3.12
 fs-s3fs==0.1.8
 fs==2.0.18
 future==0.18.2