diff --git a/pyproject.toml b/pyproject.toml
index f9ae600..01c4466 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "gym-anm"
-version = "1.1.3"
+version = "1.1.4"
 description = "A framework to build Reinforcement Learning environments for Active Network Management tasks in electricity networks."
 authors = [
     "Robin Henry <robin@robinxhenry.com>",
@@ -19,7 +19,7 @@ python = "^3.8"
 numpy = "^1.23.5"
 pandas = "^1.5.2"
 cvxpy = "^1.2.2"
-gym = "^0.21"
+gym = "^0.26.2"
 websocket-client = "0.56.0"
 websocket-server = "0.4"
 requests = "^2.28.1"