diff --git a/pyproject.toml b/pyproject.toml
index 9b34bb3..12048a9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,7 +14,7 @@ classifiers = [
   "Programming Language :: Python :: 3.14",
 ]
 dependencies = [
-  "cosl==1.4.0",
+  "cosl==1.6.1",
   "opentelemetry-api==1.40.0",
   "ops==3.6.0",
   "pydantic==2.12.5",
diff --git a/uv.lock b/uv.lock
index dd36ff5..0c3d072 100644
--- a/uv.lock
+++ b/uv.lock
@@ -345,7 +345,7 @@ unit = [
 
 [package.metadata]
 requires-dist = [
-    { name = "cosl", specifier = "==1.4.0" },
+    { name = "cosl", specifier = "==1.6.1" },
     { name = "opentelemetry-api", specifier = "==1.40.0" },
     { name = "ops", specifier = "==3.6.0" },
     { name = "pydantic", specifier = "==2.12.5" },
@@ -406,7 +406,7 @@ wheels = [
 
 [[package]]
 name = "cosl"
-version = "1.4.0"
+version = "1.6.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "ops" },
@@ -415,9 +415,9 @@ dependencies = [
     { name = "tenacity" },
     { name = "typing-extensions" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/f4/de/c41b6308ce2a6a1523fe1d5cebb831ad779e55008f8d8c0c724fccc4b407/cosl-1.4.0.tar.gz", hash = "sha256:eb6ebf682f76eec24e3c9759fb6fe5185660fcf7bb3dd8adc42e5a74816c8615", size = 46191, upload-time = "2025-11-25T17:16:01.105Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/e5/98/1a1f8aa7965ede9abfeb649b83375baf4e2f523778f90b841281cbe3603a/cosl-1.6.1.tar.gz", hash = "sha256:f96a6a978dfdee4a3b460cc48fa18514663bbc1c3a4f323315e3dbe3e6a2a596", size = 149512, upload-time = "2026-03-09T21:44:46.744Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/ba/9b/716ceb6021530b9cdbbfd681b7f296b660cdc763c365283e82581a71c299/cosl-1.4.0-py3-none-any.whl", hash = "sha256:410042805b17876c19d405ff5bf5c2461a84a7bff389ce3ad928f44e8c09b882", size = 36649, upload-time = "2025-11-25T17:16:00.098Z" },
+    { url = "https://files.pythonhosted.org/packages/f0/8f/3ca0f470fbc7b26ed33b5fe5815e38b6a628b8bb4df961924cae38755c46/cosl-1.6.1-py3-none-any.whl", hash = "sha256:12db85a81317c5b056171642098be91c09e78e04875ed1262b99681dea43b533", size = 37800, upload-time = "2026-03-09T21:44:45.373Z" },
 ]
 
 [[package]]