diff --git a/docs/getting-started/installation.en.md b/docs/getting-started/installation.en.md
index c110000b..ee731b9a 100644
--- a/docs/getting-started/installation.en.md
+++ b/docs/getting-started/installation.en.md
@@ -9,7 +9,7 @@ A focused installation checklist. For the full learning path, start with the
 |---|---|
 | Python | 3.12 or newer |
 | Dependency manager | `uv` |
-| Simulator backend | `genesis-world>=0.4.7` |
+| Simulator backend | `genesis-world>=1.0.0,<1.1.0` (1.1.x changes APIs GeneLab relies on) |
 | PyTorch | `torch>=2.8.0` through one `torch-*` extra |
 
 ## Syncing the environment
diff --git a/docs/getting-started/installation.zh.md b/docs/getting-started/installation.zh.md
index b5ad3783..24c06f2e 100644
--- a/docs/getting-started/installation.zh.md
+++ b/docs/getting-started/installation.zh.md
@@ -8,7 +8,7 @@
 |---|---|
 | Python | 3.12 或更新 |
 | 依赖管理 | `uv` |
-| 仿真后端 | `genesis-world>=0.4.7` |
+| 仿真后端 | `genesis-world>=1.0.0,<1.1.0`（1.1.x 改动了 GeneLab 依赖的 API） |
 | PyTorch | 通过一个 `torch-*` extra 安装 `torch>=2.8.0` |
 
 ## 同步环境
diff --git a/pyproject.toml b/pyproject.toml
index 53004279..93f12b38 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -9,7 +9,8 @@ requires-python = ">=3.12"
 authors = [{ name = "Chenhao Zhang", email = "charles040318@gmail.com" }]
 maintainers = [{ name = "Chenhao Zhang", email = "charles040318@gmail.com" }]
 dependencies = [
-    "genesis-world>=1.0.0,<2.0.0",
+    # Pin to Genesis 1.0.x: 1.1.x changes parts of the API GeneLab relies on.
+    "genesis-world>=1.0.0,<1.1.0",
     "typer>=0.12",
     "rich>=13",
     "questionary>=2",
diff --git a/uv.lock b/uv.lock
index 418cb14b..f2133bf8 100644
--- a/uv.lock
+++ b/uv.lock
@@ -936,7 +936,7 @@ skrl = [
 
 [package.metadata]
 requires-dist = [
-    { name = "genesis-world", specifier = ">=1.0.0,<2.0.0" },
+    { name = "genesis-world", specifier = ">=1.0.0,<1.1.0" },
     { name = "gymnasium", marker = "extra == 'rl'", specifier = ">=1.0" },
     { name = "gymnasium", marker = "extra == 'sb3'", specifier = ">=1.0" },
     { name = "imgui-bundle", marker = "extra == 'imgui'" },
@@ -1310,6 +1310,7 @@ wheels = [
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+    { url = "https://files.pythonhosted.org/packages/82/f3/6c3d3e031169bc07244d212f2ba81c52d9d77e53c56881f2c738bbc9f5ff/imgui_bundle-1.92.801-cp314-cp314-pyemscripten_2026_0_wasm32.whl", hash = "sha256:dbfeb4dcd766d8622f76f0f115fe96021e02435dfc98539516de2af1c93f42ba", size = 4962249, upload-time = "2026-06-12T15:31:12.173Z" },
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 ]