diff --git a/poetry.lock b/poetry.lock
index d49b3d85..1510fa0e 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -258,6 +258,7 @@ files = [
 
 [package.dependencies]
 certifi = "*"
+h2 = {version = ">=3,<5", optional = true, markers = "extra == \"http2\""}
 httpcore = ">=0.15.0,<0.18.0"
 idna = "*"
 sniffio = "*"
diff --git a/pyproject.toml b/pyproject.toml
index d62557cf..3cb26fb9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -27,8 +27,7 @@ python = "^3.7"
 # Mandatory dependencies
 methoddispatch = "^3.0.2"
 msgpack = "^1.0.0"
-httpx = "^0.24.1"
-h2 = "^4.0.0"
+httpx = { version = "^0.24.1", extras = ["http2"] }
 
 # Optional dependencies
 pycrypto = { version = "^2.6.1", optional = true }