diff --git a/poetry.lock b/poetry.lock
index 0bea9d98..0e71f83f 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -207,6 +207,32 @@ 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"
@@ -296,6 +322,17 @@ 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"
@@ -874,4 +911,4 @@ oldcrypto = ["pycrypto"]
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.7"
-content-hash = "b982d490ba17297b4c73b24bcf75256f1cfc709f56336a9cf5ca2653c72c0572"
+content-hash = "822cadc0134225a385d942104ec1377a7d680d87a354501a18e0ac7426fb03dd"
diff --git a/pyproject.toml b/pyproject.toml
index 3e1cb3a1..694264af 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -36,7 +36,8 @@ httpx = [
   { version = "^0.24.1", python = "~3.7" },
   { version = "^0.25.0", python = "^3.8" },
 ]
-#h2 = "^4.1.0"
+h2 = "^4.1.0" # required for httx package, HTTP2 communication
+
 # Optional dependencies
 pycrypto = { version = "^2.6.1", optional = true }
 pycryptodome = { version = "*", optional = true }
@@ -45,15 +46,10 @@ pyee = [
   { version = "^9.0.4", python = "~3.7" },
   { version = "^11.1.0", python = "^3.8" }
 ]
-#h2 = [
-#  { version = "^3.1.0", python = "~3.7" },
-#  { version = "^4.1.0", python = "^3.8" }
-#]
 
 [tool.poetry.extras]
 oldcrypto = ["pycrypto"]
 crypto = ["pycryptodome"]
-#http2 = ["h2"]
 
 [tool.poetry.dev-dependencies]
 pytest = "^7.1"