diff --git a/pyproject.toml b/pyproject.toml
index 87816bac5..7593dd914 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -43,7 +43,7 @@ dev = [
     "flake8==7.0.0",
     "flake8-docstrings==1.7.0",
     "pandas==2.3.0",
-    "pytest==8.4.2",
+    "pytest==9.0.3",
     "pytest-cov==7.0.0",
     "derp==0.1.1",
     "tomli>=2.2.1",
diff --git a/src/citrine/__version__.py b/src/citrine/__version__.py
index 064c0b35b..c7a18d13e 100644
--- a/src/citrine/__version__.py
+++ b/src/citrine/__version__.py
@@ -1 +1 @@
-__version__ = "4.0.2"
+__version__ = "4.0.3"
diff --git a/test_requirements.txt b/test_requirements.txt
index 68fdbe5bb..4f7f50ece 100644
--- a/test_requirements.txt
+++ b/test_requirements.txt
@@ -3,7 +3,7 @@ factory-boy==3.3.3
 flake8==7.0.0
 flake8-docstrings==1.7.0
 mock==5.2.0
-pytest==8.4.2
+pytest==9.0.3
 pytest-cov==7.0.0
 requests-mock==1.12.1
 pandas>=2.0.3,<3