diff --git a/pyproject.toml b/pyproject.toml
index 2e6f4b8..52cd442 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -30,7 +30,7 @@ dependencies = [
 test = [
     "coverage[toml] >=5.2.1, ==5.*",
     "cram >=0.7, ==0.*",
-    "deepdiff[cli] >=7.0.0, ==7.*",
+    "deepdiff[cli] >=8.0.0, ==8.*",
     "flake8 >=3.9.0, ==3.*",
     "pylint >=2.14.5, ==2.*",
 ]
diff --git a/tests/functional/forecast.t b/tests/functional/forecast.t
index ba4b89a..a14a918 100644
--- a/tests/functional/forecast.t
+++ b/tests/functional/forecast.t
@@ -9,7 +9,7 @@ Forecast frequencies with a model trained on simulated data.
   >   --model data/simulated_sample_1/normalized_fitness.json \
   >   --delta-months 12 \
   >   --output-table "$TMP/forecasts.tsv" > /dev/null
-  $ deep diff --math-epsilon 0.000001 --significant-digits 6 "data/simulated_sample_1/forecasts.tsv" "$TMP/forecasts.tsv"
+  $ deep diff --significant-digits 6 "data/simulated_sample_1/forecasts.tsv" "$TMP/forecasts.tsv"
   {}
   $ rm -f "$TMP/forecasts.tsv"