diff --git a/mistraldashboard/default/utils.py b/mistraldashboard/default/utils.py
index e69fe53..da6d63a 100644
--- a/mistraldashboard/default/utils.py
+++ b/mistraldashboard/default/utils.py
@@ -12,8 +12,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+from dateutil import parser
 from django.template.loader import render_to_string
-import iso8601
 import json
 
 TYPES = {
@@ -53,7 +53,7 @@ def booleanfield(x):
 
 def humantime(x):
     return render_to_string("mistral/default/_humantime.html",
-                            {"datetime": iso8601.parse_date(x)})
+                            {"datetime": parser.parse(x)})
 
 
 def prettyprint(x):
diff --git a/requirements.txt b/requirements.txt
index b9cb2b1..e37aa64 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@
 # process, which may cause wedges in the gate later.
 
 pbr!=2.1.0,>=2.0.0 # Apache-2.0
-iso8601>=0.1.11 # MIT
 python-mistralclient>=4.3.0 # Apache-2.0
 PyYAML>=3.12 # MIT
-horizon>=17.1.0  # Apache-2.0
+
+horizon>=23.1.1 # Apache-2.0
diff --git a/test-requirements.txt b/test-requirements.txt
index 9bebdfc..a6b541e 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -6,6 +6,3 @@ nodeenv>=0.9.4 # BSD
 selenium>=2.50.1 # Apache-2.0
 xvfbwrapper>=0.1.3 #license: MIT
 stestr>=2.0.0 # Apache-2.0
-
-# Horizon requirements
-django-compressor>=2.0 # MIT