diff --git a/pyproject.toml b/pyproject.toml
index 2a34e3d..9184ad2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -13,7 +13,7 @@ dependencies = [
     "certifi==2025.1.31",
     "charset-normalizer==3.4.1",
     "click==8.1.8",
-    "dill==0.3.9",
+    "dill==0.4.0",
     "exceptiongroup==1.2.2",
     "idna==3.10",
     "iniconfig==2.1.0",
diff --git a/uv.lock b/uv.lock
index 258b5c6..ae14508 100644
--- a/uv.lock
+++ b/uv.lock
@@ -182,11 +182,11 @@ wheels = [
 
 [[package]]
 name = "dill"
-version = "0.3.9"
+version = "0.4.0"
 source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/70/43/86fe3f9e130c4137b0f1b50784dd70a5087b911fe07fa81e53e0c4c47fea/dill-0.3.9.tar.gz", hash = "sha256:81aa267dddf68cbfe8029c42ca9ec6a4ab3b22371d1c450abc54422577b4512c", size = 187000 }
+sdist = { url = "https://files.pythonhosted.org/packages/12/80/630b4b88364e9a8c8c5797f4602d0f76ef820909ee32f0bacb9f90654042/dill-0.4.0.tar.gz", hash = "sha256:0633f1d2df477324f53a895b02c901fb961bdbf65a17122586ea7019292cbcf0", size = 186976 }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/46/d1/e73b6ad76f0b1fb7f23c35c6d95dbc506a9c8804f43dda8cb5b0fa6331fd/dill-0.3.9-py3-none-any.whl", hash = "sha256:468dff3b89520b474c0397703366b7b95eebe6303f108adf9b19da1f702be87a", size = 119418 },
+    { url = "https://files.pythonhosted.org/packages/50/3d/9373ad9c56321fdab5b41197068e1d8c25883b3fea29dd361f9b55116869/dill-0.4.0-py3-none-any.whl", hash = "sha256:44f54bf6412c2c8464c14e8243eb163690a9800dbe2c367330883b19c7561049", size = 119668 },
 ]
 
 [[package]]
@@ -265,7 +265,7 @@ requires-dist = [
     { name = "certifi", specifier = "==2025.1.31" },
     { name = "charset-normalizer", specifier = "==3.4.1" },
     { name = "click", specifier = "==8.1.8" },
-    { name = "dill", specifier = "==0.3.9" },
+    { name = "dill", specifier = "==0.4.0" },
     { name = "exceptiongroup", specifier = "==1.2.2" },
     { name = "idna", specifier = "==3.10" },
     { name = "iniconfig", specifier = "==2.1.0" },