diff --git a/poetry.lock b/poetry.lock
index bd07ad73..68170577 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -185,6 +185,32 @@ files = [
 [package.dependencies]
 typing-extensions = {version = "*", markers = "python_version < \"3.8\""}
 
+[[package]]
+name = "h2"
+version = "4.1.0"
+description = "HTTP/2 State-Machine based protocol implementation"
+optional = false
+python-versions = ">=3.6.1"
+files = [
+    {file = "h2-4.1.0-py3-none-any.whl", hash = "sha256:03a46bcf682256c95b5fd9e9a99c1323584c3eec6440d379b9903d709476bc6d"},
+    {file = "h2-4.1.0.tar.gz", hash = "sha256:a83aca08fbe7aacb79fec788c9c0bac936343560ed9ec18b82a13a12c28d2abb"},
+]
+
+[package.dependencies]
+hpack = ">=4.0,<5"
+hyperframe = ">=6.0,<7"
+
+[[package]]
+name = "hpack"
+version = "4.0.0"
+description = "Pure-Python HPACK header compression"
+optional = false
+python-versions = ">=3.6.1"
+files = [
+    {file = "hpack-4.0.0-py3-none-any.whl", hash = "sha256:84a076fad3dc9a9f8063ccb8041ef100867b1878b25ef0ee63847a5d53818a6c"},
+    {file = "hpack-4.0.0.tar.gz", hash = "sha256:fc41de0c63e687ebffde81187a948221294896f6bdc0ae2312708df339430095"},
+]
+
 [[package]]
 name = "httpcore"
 version = "0.17.3"
@@ -229,6 +255,17 @@ cli = ["click (==8.*)", "pygments (==2.*)", "rich (>=10,<14)"]
 http2 = ["h2 (>=3,<5)"]
 socks = ["socksio (==1.*)"]
 
+[[package]]
+name = "hyperframe"
+version = "6.0.1"
+description = "HTTP/2 framing layer for Python"
+optional = false
+python-versions = ">=3.6.1"
+files = [
+    {file = "hyperframe-6.0.1-py3-none-any.whl", hash = "sha256:0ec6bafd80d8ad2195c4f03aacba3a8265e57bc4cff261e802bf39970ed02a15"},
+    {file = "hyperframe-6.0.1.tar.gz", hash = "sha256:ae510046231dc8e9ecb1a6586f63d2347bf4c8905914aa84ba585ae85f28a914"},
+]
+
 [[package]]
 name = "idna"
 version = "3.6"
@@ -794,4 +831,4 @@ oldcrypto = ["pycrypto"]
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.7"
-content-hash = "ecb2c6b5087729a169458ca2dde1e6a48563de39abcd8b3bbda5f81879042fe3"
+content-hash = "355ed5057624b3c2a2e5113a3a95adf60ed78001a494c671f285545ab9bdf042"
diff --git a/pyproject.toml b/pyproject.toml
index f4bcf275..79003623 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -33,6 +33,7 @@ python = "^3.7"
 methoddispatch = "^3.0.2"
 msgpack = "^1.0.0"
 httpx = ">= 0.24.1, < 1.0"
+h2 = "^4.1.0" # required for httx package, HTTP2 communication
 websockets = ">= 10.0, < 13.0"
 pyee = ">= 9.0.4, < 12.0"