diff --git a/build-constraints.yaml b/build-constraints.yaml
index 6d9053da..2bdd2c42 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3236,7 +3236,6 @@ packages:
 
         # WIP: Issues are coming ...
         - base < 4.10
-        - containers < 0.5.9.1
         - ghc < 8.2.1
         - ghc-boot < 8.2
         - ghc-boot-th < 8.1
@@ -3343,7 +3342,7 @@ package-flags:
         ghc_8_0: true
 
     functor-classes-compat:
-        containers: false
+        containers: true
 
     timezone-series:
         time_1_6_and_1_7: true