diff --git a/build-constraints.yaml b/build-constraints.yaml
index cb1fc890..2c7facd3 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -8105,6 +8105,7 @@ expected-test-failures:
     - unicode-data # 0.6.0 https://github.com/composewell/unicode-data/issues/137
     - uri-templater # 1.0.0.1 https://github.com/iand675/uri-templater/issues/18
     - vary # 0.1.1.3 doctest-0.4
+    - web3-tools # 0.1.0.0 https://github.com/gtollini/web3-tools/issues/1
 
     # Intermittent failures or unreliable. These tests may pass when
     # re-enabled, but will eventually fail again.