diff --git a/delaunayNd.cabal b/delaunayNd.cabal
index 0483c55..28b3954 100644
--- a/delaunayNd.cabal
+++ b/delaunayNd.cabal
@@ -30,7 +30,6 @@ library
   build-depends:       base >= 4.9 && < 5
                      , containers >= 0.6.4.1 && < 0.8
                      , extra >= 1.7.7 && < 1.8
-                     , ilist >= 0.4.0.1 && < 0.5
                      , hashable >= 1.3.5.0 && < 1.5
                      , insert-ordered-containers >= 0.2.5.3 && < 0.3
                      , Unique >= 0.4.7.9 && < 0.5
diff --git a/stack.yaml b/stack.yaml
index c75dbe7..b192b82 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -7,5 +7,4 @@ packages:
 
 extra-deps:
 - Unique-0.4.7.9@sha256:7c37e22b7bb9df935c22112e67043177461aedcebe3a958854f6c0e9ecb54083,2155
-- ilist-0.4.0.1@sha256:126019faf3d02f305c5762ae9602be1cbf76291153a1a7461270ad1429678111,3305
 - insert-ordered-containers-0.2.5.3@sha256:40b1454477141796d9647904c09d1a03ca792e6111161d854c2e806156c4cf37,2384
diff --git a/stack.yaml.lock b/stack.yaml.lock
index 5940195..16211f6 100644
--- a/stack.yaml.lock
+++ b/stack.yaml.lock
@@ -11,13 +11,6 @@ packages:
       size: 1366
   original:
     hackage: Unique-0.4.7.9@sha256:7c37e22b7bb9df935c22112e67043177461aedcebe3a958854f6c0e9ecb54083,2155
-- completed:
-    hackage: ilist-0.4.0.1@sha256:126019faf3d02f305c5762ae9602be1cbf76291153a1a7461270ad1429678111,3305
-    pantry-tree:
-      sha256: 1e45ec9d7d543f0689da97b6de57b9a729c605660af73e15848c10b37640a888
-      size: 438
-  original:
-    hackage: ilist-0.4.0.1@sha256:126019faf3d02f305c5762ae9602be1cbf76291153a1a7461270ad1429678111,3305
 - completed:
     hackage: insert-ordered-containers-0.2.5.3@sha256:40b1454477141796d9647904c09d1a03ca792e6111161d854c2e806156c4cf37,2384
     pantry-tree: