diff --git a/requirements/CI/conda.txt b/requirements/CI/conda.txt
index 2aec05853..8327c46cd 100644
--- a/requirements/CI/conda.txt
+++ b/requirements/CI/conda.txt
@@ -1,2 +1,2 @@
-msprime==1.4.0
+msprime==1.4.1
 slim==5.1