diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 498914e0d6124ea3e11d3895b52d792c9d6b06a2..c947ab6ff2372c5b49d397f512a084c542a74854 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -19,6 +19,7 @@ build:
          - brick
          - composite-base
          - hint
+         - monoidal-containers
          - optics
          - pipes
          - pipes-attoparsec
diff --git a/README.md b/README.md
index c977fa928cda960a8d81388634f9eef475b9ffe2..47f0ad29645e04dc2af31ffe637ce58e3b1a84ab 100644
--- a/README.md
+++ b/README.md
@@ -18,6 +18,7 @@ The following things are always expected to be here:
 * brick
 * composite-base
 * hint
+* monoidal-containers
 * optics
 * polysemy
 * polysemy-plugin
diff --git a/configuration.nix b/configuration.nix
index 0a5ca6b9ebb50d44ec57aaa2c51d9eae1fed609d..ac767626f4ab7d5399978c3f2aaaef7fee3ab980 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -12,8 +12,6 @@ final: prev: {
 
   extensible-effects = null;
 
-  monoidal-containers = null;
-
   persistent-qq = null;
 
   protolude = null;