update since cache
diff --git a/tool/since/dart_sdk.yaml b/tool/since/dart_sdk.yaml
index 55e9464..a2683c1 100644
--- a/tool/since/dart_sdk.yaml
+++ b/tool/since/dart_sdk.yaml
@@ -1,5 +1,12 @@
+2.6.0-dev.6.0 : 0.1.100
+2.6.0-dev.5.0 : 0.1.99
+2.6.0-dev.4.0 : 0.1.98
+2.6.0-dev.3.0 : 0.1.98
+2.6.0-dev.2.0 : 0.1.97+1
 2.6.0-dev.1.0 : 0.1.97+1
 2.6.0-dev.0.0 : 0.1.97+1
+2.5.2 : 0.1.96
+2.5.1 : 0.1.96
 2.5.0 : 0.1.96
 2.5.0-dev.4.0 : 0.1.96
 2.5.0-dev.3.0 : 0.1.96