diff --git a/requirements.txt b/requirements.txt
index 79338f2..d6ac051 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,7 +6,7 @@ numpy>=2.0.0,<3.0.0
 # only raising, and 1.11.1 is the release that shortens over-long cache names.
 datacache>=1.14.0,<2.0.0
 # Public data acquisition and original-read extraction for the osteosarc corpus.
-osteosarc>=0.14.4,<0.15
+osteosarc>=0.15.4,<0.16
 pandas>=2.1.4,<4.0.0
 # Metadata-only Transcript/Gene restore defers annotation DB access (#563).
 pyensembl>=2.22.2,<3.0.0
@@ -16,11 +16,11 @@ pyensembl>=2.22.2,<3.0.0
 # partial proteins and uncertain selenocysteine decoding.
 varcode>=10.10.2,<11.0.0
 # 1.42.1 corrects flanking-indel candidate matching. The fusion consumer
-# validates isovar.fusion_rna.v3 explicitly; audited through 1.44.2. Raw
+# validates isovar.fusion_rna.v3 explicitly; audited through 1.45.0. Raw
 # assembly support remains distinct from opt-in fractional catalog support.
 # Retains matched germline input, directional calibration and run thresholds.
-# 1.45 changes Osteosarc's minor window; coordinate with Topiary first (#571).
-isovar>=1.42.1,<1.45.0
+# 1.45 requires Osteosarc 0.15.4; Topiary 5.93.3 accepts that shared window.
+isovar>=1.45.0,<2.0.0
 # 3.33.5 makes bundled YAML loading independent of the host locale.
 mhcgnomes>=3.64.4,<4.0.0
 # 3.41.0 supplies mhctools.cleavage (CleavageInput/CleavageModel/CleavageResult/
@@ -47,7 +47,8 @@ mhctools>=3.44.64,<4.0.0
 # Native Exacto/mixed report replay requires typed scalar/structured annotations
 # and nullable integer/boolean cells. Public occurrence/reconciliation and
 # additive rescoring APIs are consumed together; 5.93.2 fixes that replay.
-topiary>=5.93.2,<6.0.0
+# 5.93.3 accepts Osteosarc 0.15 alongside 0.14, enabling Isovar 1.45.
+topiary>=5.93.3,<6.0.0
 roman
 jinja2>=3.1
 weasyprint>=62.0
diff --git a/tests/test_declared_dependencies.py b/tests/test_declared_dependencies.py
index 9510211..14a8bae 100644
--- a/tests/test_declared_dependencies.py
+++ b/tests/test_declared_dependencies.py
@@ -155,11 +155,15 @@ def test_shared_data_window_keeps_compatible_sibling_floors():
     """An Osteosarc window change requires reviewing both sibling floors.
 
     Published Isovar 1.39.5 and Topiary 5.82.0 first accept Osteosarc 0.14;
-    earlier admitted releases require incompatible windows (#533).
+    earlier admitted releases require incompatible windows (#533). Isovar
+    1.45.0 and Topiary 5.93.3 enable the audited Osteosarc 0.15 window (#571).
     """
     osteosarc = requirement_named("osteosarc")
     window = floor_of(osteosarc).release[:2]
-    reviewed = {(0, 14): {"isovar": "1.39.5", "topiary": "5.82.0"}}
+    reviewed = {
+        (0, 14): {"isovar": "1.39.5", "topiary": "5.82.0"},
+        (0, 15): {"isovar": "1.45.0", "topiary": "5.93.3"},
+    }
     assert window in reviewed, "Review sibling compatibility for the new Osteosarc window"
     for name, compatible in reviewed[window].items():
         floor = floor_of(requirement_named(name))
diff --git a/vaxrank/version.py b/vaxrank/version.py
index ce8b542..ca04ffa 100644
--- a/vaxrank/version.py
+++ b/vaxrank/version.py
@@ -1,4 +1,4 @@
-__version__ = "3.38.0"
+__version__ = "3.38.1"
 
 
 def print_version():