diff --git a/pyproject.toml b/pyproject.toml
index 45e96064..56a466fc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -32,7 +32,11 @@ python = "^3.7"
 # Mandatory dependencies
 methoddispatch = "^3.0.2"
 msgpack = "^1.0.0"
-httpx = { version = "< 1.0, >= 0.24.1", extras = ["http2"] }
+httpx = [
+  { version = "^0.24.1", python = "~3.7" },
+  { version = ">=0.25.0, < 1.0", python = "^3.8" },
+]
+h2 = "^4.1.0" # required for httx package, HTTP2 communication
 websockets = ">= 10.0, < 13.0"
 pyee = [
   { version = "^9.0.4", python = "~3.7" },