diff --git a/dev-requirements.txt b/dev-requirements.txt
index 9ca7aa6..96a12c4 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -64,7 +64,7 @@ coverage==7.6.1
     # via pytest-cov
 cycler==0.12.1
     # via matplotlib
-cytoolz==0.12.3
+cytoolz==1.0.1
     # via swmmanywhere
 dill==0.3.9
     # via multiprocess
diff --git a/requirements.txt b/requirements.txt
index 8e189b6..60ab088 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -54,7 +54,7 @@ contourpy==1.3.0
     # via matplotlib
 cycler==0.12.1
     # via matplotlib
-cytoolz==0.12.3
+cytoolz==1.0.1
     # via swmmanywhere
 dill==0.3.9
     # via multiprocess