diff --git a/var/spack/repos/builtin/packages/iq-tree/package.py b/var/spack/repos/builtin/packages/iq-tree/package.py
index 4a5bb01c253..ed403899858 100644
--- a/var/spack/repos/builtin/packages/iq-tree/package.py
+++ b/var/spack/repos/builtin/packages/iq-tree/package.py
@@ -16,6 +16,9 @@ class IqTree(CMakePackage):
 
     license("GPL-2.0-or-later")
 
+    version(
+        "2.3.1", tag="v2.3.1", commit="2914a2f7aac0a1a3c4fadde42c83e5dee315186d", submodules=True
+    )
     version(
         "2.2.2.7",
         tag="v2.2.2.7",