diff --git a/repos.bzl b/repos.bzl
index b413290..857021f 100644
--- a/repos.bzl
+++ b/repos.bzl
@@ -22,7 +22,7 @@
     if not native.existing_rule("com_google_mpact-sim"):
         http_archive(
             name = "com_google_mpact-sim",
-            sha256 = "10bd6f43f6d340535f0eef15bb946c8332e62148458a2dc3b6a412739b4cf253",
-            strip_prefix = "mpact-sim-d958141f3e6f8dfbdc79e35a9beabaea490e479c",
-            url = "https://github.com/google/mpact-sim/archive/d958141f3e6f8dfbdc79e35a9beabaea490e479c.tar.gz",
+            sha256 = "ccf86869155d65bfeed358ab5beaa93689c0b05d4ce8bc542531005261f598f1",
+            strip_prefix = "mpact-sim-312648e0d973352ec380a3796fa9e792c405dbcf",
+            url = "https://github.com/google/mpact-sim/archive/312648e0d973352ec380a3796fa9e792c405dbcf.tar.gz",
         )