diff --git a/pyproject.toml b/pyproject.toml
index 694264af..15406a51 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -33,10 +33,10 @@ python = "^3.7"
 methoddispatch = "^3.0.2"
 msgpack = "^1.0.0"
 httpx = [
-  { version = "^0.24.1", python = "~3.7" },
-  { version = "^0.25.0", python = "^3.8" },
+  { version = "^0.24.1", python = "~3.7", extras= ["http2"] },
+  { version = "^0.25.0", python = "^3.8", extras= ["http2"] },
 ]
-h2 = "^4.1.0" # required for httx package, HTTP2 communication
+#h2 = "^4.1.0" # required for httx package, HTTP2 communication
 
 # Optional dependencies
 pycrypto = { version = "^2.6.1", optional = true }