diff --git a/pyproject.toml b/pyproject.toml
index 5e58ac1fb..6f5827bf3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -38,7 +38,7 @@ dependencies = [
     "cryptography>=42.0,<45.1",  # relaxed upper bound here to get security fixes
     "flask>=3.0,<=3.1.2",
     "h11>=0.16.0,<=0.16.0",
-    "h2>=4.1,<=4.2.0",
+    "h2>=4.3.0,<=4.3.0",
     "hyperframe>=6.0,<=6.1.0",
     "kaitaistruct>=0.10,<=0.10",
     "ldap3>=2.8,<=2.9.1",
diff --git a/uv.lock b/uv.lock
index d11ea19ff..cc56d092c 100644
--- a/uv.lock
+++ b/uv.lock
@@ -429,15 +429,15 @@ wheels = [
 
 [[package]]
 name = "h2"
-version = "4.1.0"
+version = "4.3.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "hpack" },
     { name = "hyperframe" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/2a/32/fec683ddd10629ea4ea46d206752a95a2d8a48c22521edd70b142488efe1/h2-4.1.0.tar.gz", hash = "sha256:a83aca08fbe7aacb79fec788c9c0bac936343560ed9ec18b82a13a12c28d2abb", size = 2145593 }
+sdist = { url = "https://files.pythonhosted.org/packages/1d/17/afa56379f94ad0fe8defd37d6eb3f89a25404ffc71d4d848893d270325fc/h2-4.3.0.tar.gz", hash = "sha256:6c59efe4323fa18b47a632221a1888bd7fde6249819beda254aeca909f221bf1", size = 2152026 }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/2a/e5/db6d438da759efbb488c4f3fbdab7764492ff3c3f953132efa6b9f0e9e53/h2-4.1.0-py3-none-any.whl", hash = "sha256:03a46bcf682256c95b5fd9e9a99c1323584c3eec6440d379b9903d709476bc6d", size = 57488 },
+    { url = "https://files.pythonhosted.org/packages/69/b2/119f6e6dcbd96f9069ce9a2665e0146588dc9f88f29549711853645e736a/h2-4.3.0-py3-none-any.whl", hash = "sha256:c438f029a25f7945c69e0ccf0fb951dc3f73a5f6412981daee861431b70e2bdd", size = 61779 },
 ]
 
 [[package]]
@@ -780,7 +780,7 @@ requires-dist = [
     { name = "cryptography", specifier = ">=42.0,<45.1" },
     { name = "flask", specifier = ">=3.0,<=3.1.2" },
     { name = "h11", specifier = "<=0.16.0,>=0.16.0" },
-    { name = "h2", specifier = ">=4.1,<=4.2.0" },
+    { name = "h2", specifier = "<=4.3.0,>=4.3.0" },
     { name = "hyperframe", specifier = ">=6.0,<=6.1.0" },
     { name = "kaitaistruct", specifier = "<=0.10,>=0.10" },
     { name = "ldap3", specifier = ">=2.8,<=2.9.1" },