diff --git a/build-constraints.yaml b/build-constraints.yaml
index cd20824b..78aafd59 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3344,7 +3344,6 @@ packages:
         - skeletons < 0 # build failure with GHC 8.4
         - sql-words < 0 # build failure with GHC 8.4
         - timespan < 0 # build failure with GHC 8.4
-        - timezone-olson < 0 # build failure with GHC 8.4
         - tinytemplate < 0 # build failure with GHC 8.4
         - transient < 0 # build failure with GHC 8.4
         - tuple < 0 # build failure with GHC 8.4
@@ -4956,10 +4955,6 @@ package-flags:
     functor-classes-compat:
         containers: true
 
-    timezone-series:
-        time_1_6_and_1_7: false
-        time_pre_1_6: false
-
     mintty:
         win32-2-5: true