diff --git a/.weeder.yaml b/.weeder.yaml
deleted file mode 100644
index bde96e6..0000000
--- a/.weeder.yaml
+++ /dev/null
@@ -1,7 +0,0 @@
-- package:
-  - name: graphula-core
-  - section:
-    - name: test:readme
-    - message:
-      - name: Redundant build-depends entry
-      - depends: markdown-unlit # executable dependency
diff --git a/weeder.dhall b/weeder.dhall
new file mode 100644
index 0000000..8b22d35
--- /dev/null
+++ b/weeder.dhall
@@ -0,0 +1,9 @@
+{ roots =
+  [ "^Main\\.main\$"
+  , "^Paths_.*"
+  , "^Graphula\\.runGraphulaIdempotentT\$"
+  , "^Graphula\\.runGraphulaLoggedT\$"
+  , "^Graphula\\.Key\\.onlyKey\$"
+  ]
+, type-class-roots = True
+}