diff --git a/build-constraints.yaml b/build-constraints.yaml
index efa8ec98..41da79a5 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -5561,7 +5561,6 @@ packages:
         - exceptional < 0
         - true-name < 0
         - probability < 0
-        - concurrency < 0
         - cron < 0
         - store-core < 0
         - bitcoin-script < 0
@@ -5610,7 +5609,6 @@ packages:
 
         # Round 2 build failure transitive deps
         - cryptocipher < 0 # via cipher-blowfish
-        - dejafu < 0 # via concurrency
         - cublas < 0 # via cuda
         - cufft < 0 # via cuda
         - cusparse < 0 # via cuda
@@ -5633,8 +5631,6 @@ packages:
 
         # Round 3 build failure transitive deps
         - network-messagepack-rpc < 0 # via data-msgpack
-        - hunit-dejafu < 0 # via dejafu
-        - tasty-dejafu < 0 # via dejafu
 
         # More build failure transitive deps
         - random-source < 0 # via flexible-defaults