diff --git a/poetry.lock b/poetry.lock
index 7fd581c..b81435f 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -756,8 +756,8 @@ files = [
 [package.dependencies]
 numpy = [
     {version = ">=1.22.4", markers = "python_version < \"3.11\""},
-    {version = ">=1.26.0", markers = "python_version >= \"3.12\""},
     {version = ">=1.23.2", markers = "python_version == \"3.11\""},
+    {version = ">=1.26.0", markers = "python_version >= \"3.12\""},
 ]
 python-dateutil = ">=2.8.2"
 pytz = ">=2020.1"
@@ -919,8 +919,8 @@ astroid = ">=3.2.4,<=3.3.0-dev0"
 colorama = {version = ">=0.4.5", markers = "sys_platform == \"win32\""}
 dill = [
     {version = ">=0.2", markers = "python_version < \"3.11\""},
-    {version = ">=0.3.7", markers = "python_version >= \"3.12\""},
     {version = ">=0.3.6", markers = "python_version >= \"3.11\" and python_version < \"3.12\""},
+    {version = ">=0.3.7", markers = "python_version >= \"3.12\""},
 ]
 isort = ">=4.2.5,<5.13.0 || >5.13.0,<6"
 mccabe = ">=0.6,<0.8"
@@ -1119,13 +1119,13 @@ files = [
 
 [[package]]
 name = "splink"
-version = "4.0.1"
+version = "4.0.4"
 description = "Fast probabilistic data linkage at scale"
 optional = false
 python-versions = "<4.0.0,>=3.8.0"
 files = [
-    {file = "splink-4.0.1-py3-none-any.whl", hash = "sha256:30c281f8bd738085bf758b4a35b9ad18a30c6512fb165111b71a72b82eacc93f"},
-    {file = "splink-4.0.1.tar.gz", hash = "sha256:0d15b9848ff44692368cc883c8d6c77db23d7200d035879dda97c829d3989f9e"},
+    {file = "splink-4.0.4-py3-none-any.whl", hash = "sha256:fc151b2eaa8e4b0e835512fe1b1fc1e6d4333dae36c89f4c9b0595e7cb53df02"},
+    {file = "splink-4.0.4.tar.gz", hash = "sha256:b9604d120bdbba2ac2da9571b8f28102805539daae50fe7c32a0d51c48c98aef"},
 ]
 
 [package.dependencies]
@@ -1242,4 +1242,4 @@ files = [
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.10"
-content-hash = "693e2a5765cdcd6beb7b2b1c1c42a2a956e55892b0692fc69617dda7b44203e1"
+content-hash = "7578db89f1dd99e7385711dbf3bb85796d1b671f4b1e2f1d19404538f0b41cec"
diff --git a/pyproject.toml b/pyproject.toml
index f871460..bdcb447 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,7 +7,7 @@ authors = ["Pat Sier <patrick.sier@cms.hhs.gov>",
 
 [tool.poetry.dependencies]
 python = "^3.10"
-splink = "^4.0.1"
+splink = "^4.0.4"
 click = "^8.1.7"
 pandas = "^2.2.2"
 pytest = "^8.3.3"