diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7e01f27..21c7084 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,2 +1,4 @@
 - INTERNAL
   - migrate to thegeeklab namespace
+- BUGFIX
+  - pin `parsedatetime` to <2.6 to fix tests on Python 2.7
diff --git a/setup.py b/setup.py
index e8799ea..4b3f901 100644
--- a/setup.py
+++ b/setup.py
@@ -67,8 +67,10 @@ setup(
         "Topic :: System :: Networking",
         "Topic :: Utilities",
     ],
+    # FIXME: https://github.com/bear/parsedatetime/pull/247
     install_requires=[
         "acme",
+        'parsedatetime<2.6; python_version < "3"',
         "certbot>=0.15",
         "setuptools",
         "zope.interface",