diff --git a/constraints.txt b/constraints.txt
index 0a128a7..bd1684b 100644
--- a/constraints.txt
+++ b/constraints.txt
@@ -25,7 +25,7 @@
 # inference path used by this project (all-MiniLM-L6-v2 via from_pretrained).
 # Risk verdict: UNREACHABLE for this project's use case.
 
-sentence-transformers==3.4.1
+sentence-transformers==5.6.0
 scikit-learn==1.6.1
 pyyaml==6.0.2
 pydantic==2.11.0
diff --git a/pyproject.toml b/pyproject.toml
index cec8081..a85dc5b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -41,7 +41,7 @@ classifiers = [
 # - accelerate floor raised to >=1.3.0 — transformers==4.53.0's trainer module imports
 #   TorchTensorParallelPlugin from accelerate.utils, absent before accelerate 1.3.0.
 dependencies = [
-    "sentence-transformers>=3.4.1,<4.0.0",
+    "sentence-transformers>=5.6.0,<6.0.0",
     "scikit-learn>=1.5.0",
     "pyyaml>=6.0",
     "pydantic>=2.0",
diff --git a/requirements.txt b/requirements.txt
index a0ff971..2146b4c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -15,7 +15,7 @@
 #   not just on model load)
 # - sentence-transformers: 3.4.1 is the latest 3.x stable, tested against transformers 4.53+
 
-sentence-transformers>=3.4.1,<4.0.0
+sentence-transformers>=5.6.0,<6.0.0
 scikit-learn>=1.5.0
 pyyaml>=6.0
 pydantic>=2.0