diff --git a/pyproject.toml b/pyproject.toml
index 20d2bf7..d25f543 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,7 +16,7 @@ dependencies = [
     "httpx==0.28.1",
     "paramiko==3.5.1",
     "pydantic-marc==0.1.0",
-    "pymarc>=5.3",
+    "pymarc>=5.4.0",
     "pysftp==0.2.9",
     "python-dotenv==1.2.2",
     "requests==2.34.2",
diff --git a/uv.lock b/uv.lock
index d002f12..c2e7048 100644
--- a/uv.lock
+++ b/uv.lock
@@ -414,7 +414,7 @@ requires-dist = [
     { name = "httpx", specifier = "==0.28.1" },
     { name = "paramiko", specifier = "==3.5.1" },
     { name = "pydantic-marc", specifier = "==0.1.0" },
-    { name = "pymarc", specifier = ">=5.3" },
+    { name = "pymarc", specifier = ">=5.4.0" },
     { name = "pysftp", specifier = "==0.2.9" },
     { name = "python-dotenv", specifier = "==1.2.2" },
     { name = "requests", specifier = "==2.34.2" },
@@ -577,11 +577,11 @@ wheels = [
 
 [[package]]
 name = "pymarc"
-version = "5.3.1"
+version = "5.4.0"
 source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/e2/28/8cd999db1c4c6d7e855e7596bc17294829e95e818473afbb655cfa167dd0/pymarc-5.3.1.tar.gz", hash = "sha256:d289233d7298aeae45d976081710391cf21e754f73928132508b8adfe8ea0b49", size = 235395, upload-time = "2025-06-18T13:57:51.3Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/19/77/f0e5774845a3c60b26da5dab344e391e9941eeb811a1685fb2ff01ae90c7/pymarc-5.4.0.tar.gz", hash = "sha256:b2016b1674d1956636c99b9bf95b31840c5cb8f22645672a660e66326371b2f3", size = 76224964, upload-time = "2026-07-02T12:12:51.002Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/ca/ba/058498db9945b4f0b1bbf9d2e3095d3c4c21934946953056b1a0751cc5a1/pymarc-5.3.1-py3-none-any.whl", hash = "sha256:3fcc09f9d51ef27c40f8d215e3219d0f3eb29716a0767e689c4923e38182ad73", size = 160259, upload-time = "2025-06-18T13:57:46.869Z" },
+    { url = "https://files.pythonhosted.org/packages/f9/41/ed8ad9925859d66fe7135f64690ecb5c766e2969e9a52c23d1123df9eaf5/pymarc-5.4.0-py3-none-any.whl", hash = "sha256:10549ce513c191f77b081e5e505c02aca76f6b9f1164c47a326bb635b24a77eb", size = 161390, upload-time = "2026-07-02T12:12:55.949Z" },
 ]
 
 [[package]]