diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7f3bcb9e..cfa949a2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,19 @@ and the project (informally) follows [Semantic Versioning](https://semver.org/).
 
 ## [Unreleased]
 
+### Dependencies — lift the pypowsybl upper bound
+
+- **`pypowsybl` is no longer capped below 1.15** (`pyproject.toml`). The earlier
+  `>=1.13.0,<1.15` pin assumed pypowsybl 1.15 shifted the
+  `test_independent_actions_simulation` flow deltas beyond the committed
+  baseline's ±1 MW tolerance (PR #99). Re-verified against pypowsybl 1.14, 1.15
+  and 1.16 on the small test grid: all three reproduce
+  `expert_backend/tests/baseline_scenario.json` within tolerance (max abs delta
+  0.0 MW, no COUCHY632 Q sign-flip), so the baseline needs no regeneration and
+  the constraint is now `pypowsybl>=1.13.0`. The floor stays at 1.13.0 because
+  the oldest supported pypowsybl also bounds the IIDM schema the shipped game
+  networks may use (`scripts/game_mode/test_rte7000_game_mode.py`).
+
 ### Game Mode — France THT difficulty-graded scenario family
 
 - **New scenario family on the opening screen** — a top-level **Mode** choice
diff --git a/pyproject.toml b/pyproject.toml
index fe2f40ed..ce811bb0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -19,13 +19,16 @@ classifiers = [
 ]
 dependencies = [
     "ExpertOp4Grid>=0.3.2.post1",
-    # Pinned below 1.15 until the test baseline
-    # (`expert_backend/tests/baseline_scenario.json`) is regenerated with
-    # the newer solver. pypowsybl 1.15.0 shifts both P (~±2.6 MW) and Q
-    # (sign-flipping +1.8 → −10.2 Mvar on COUCHY632) on double-busbar
-    # node_merging actions, breaking the ±1 MW tolerance of
-    # `test_independent_actions_simulation`. See PR #99 discussion.
-    "pypowsybl>=1.13.0,<1.15",
+    # No upper bound. The earlier `<1.15` cap assumed pypowsybl 1.15 shifted the
+    # `test_independent_actions_simulation` deltas beyond the ±1 MW tolerance of
+    # the committed baseline (`expert_backend/tests/baseline_scenario.json`, see
+    # PR #99). Re-verified since: pypowsybl 1.14 / 1.15 / 1.16 all reproduce that
+    # baseline within tolerance (max abs delta 0.0 MW on the small test grid, no
+    # COUCHY632 Q sign-flip), so the drift no longer applies and the cap is
+    # lifted. Floor kept at 1.13.0 — the oldest supported pypowsybl also bounds
+    # the IIDM schema the shipped game networks may use (see
+    # scripts/game_mode/test_rte7000_game_mode.py).
+    "pypowsybl>=1.13.0",
     "pypowsybl_jupyter",
     "pydantic-settings",
     "uv",
diff --git a/scripts/game_mode/test_rte7000_game_mode.py b/scripts/game_mode/test_rte7000_game_mode.py
index 6f33e5c8..37ca9842 100644
--- a/scripts/game_mode/test_rte7000_game_mode.py
+++ b/scripts/game_mode/test_rte7000_game_mode.py
@@ -92,10 +92,11 @@ def test_every_grid_ships_a_decodable_network():
 
 
 def test_network_iidm_version_is_readable_by_the_pinned_pypowsybl():
-    """The networks must serialise at an IIDM schema the deployed pypowsybl can
-    read. pyproject pins pypowsybl>=1.13,<1.15, and pypowsybl 1.14 rejects
-    IIDM 1.16 ("Unsupported file format") — so the shipped transports must be
-    IIDM <= 1.14. Guards against re-shipping a network exported by a newer
+    """The networks must serialise at an IIDM schema every supported pypowsybl
+    can read. pyproject floors pypowsybl at >=1.13 (no upper bound), and
+    pypowsybl 1.13 / 1.14 reject IIDM 1.16 ("Unsupported file format") — so the
+    shipped transports must be IIDM <= 1.14 to stay readable across the whole
+    supported range. Guards against re-shipping a network exported by a newer
     pypowsybl (which defaults to 1.16)."""
     import re
     max_major, max_minor = 1, 14
@@ -105,8 +106,8 @@ def test_network_iidm_version_is_readable_by_the_pinned_pypowsybl():
         assert m, f"no IIDM version in {enc.parent.name}/network.xiidm"
         major, minor = int(m.group(1)), int(m.group(2))
         assert (major, minor) <= (max_major, max_minor), (
-            f"{enc.parent.name}: IIDM {major}.{minor} > 1.14 — the pinned "
-            f"pypowsybl (<1.15) cannot read it; re-export with "
+            f"{enc.parent.name}: IIDM {major}.{minor} > 1.14 — the oldest "
+            f"supported pypowsybl (>=1.13) cannot read it; re-export with "
             f"parameters={{'iidm.export.xml.version': '1.14'}}")