diff --git a/lib/interscript/ml/imf.rb b/lib/interscript/ml/imf.rb
index 6e8b9dd3..85e09dc7 100644
--- a/lib/interscript/ml/imf.rb
+++ b/lib/interscript/ml/imf.rb
@@ -14,7 +14,7 @@ module IMF
     EOS_ID = 1
     UNK_ID = 2
 
-    DEFAULT_INDEX_URL = "https://github.com/interscript/interscript-models/releases/download/index-v8/models-index.yaml"
+    DEFAULT_INDEX_URL = "https://github.com/interscript/interscript-models/releases/download/index-v9/models-index.yaml"
 
     class FormatError < StandardError; end
     class RegistryError < StandardError; end
diff --git a/spec/interscript/ml/imf_spec.rb b/spec/interscript/ml/imf_spec.rb
index 3e09cd12..b14e65b4 100644
--- a/spec/interscript/ml/imf_spec.rb
+++ b/spec/interscript/ml/imf_spec.rb
@@ -185,7 +185,7 @@
       # the distribution contract has shipped, incl. static-int8 (v6).
       # Bump this spec WITH the constant, never ahead of it.
       expect(Interscript::ML::IMF::DEFAULT_INDEX_URL).to eq(
-        "https://github.com/interscript/interscript-models/releases/download/index-v8/models-index.yaml"
+        "https://github.com/interscript/interscript-models/releases/download/index-v9/models-index.yaml"
       )
       expect(Interscript::ML::IMF::DEFAULT_INDEX_URL).not_to include("raw.githubusercontent")
     end