diff --git a/rubygem-activesupport.spec b/rubygem-activesupport.spec
index b412927..e0ac9e0 100644
--- a/rubygem-activesupport.spec
+++ b/rubygem-activesupport.spec
@@ -32,6 +32,10 @@ Patch3: rubygem-activesupport-7.0.2.3-Fix-tests-for-minitest-5.16.patch
 Requires: rubygem(bigdecimal)
 Requires: rubygem(json)
 
+# Runtime dependency, lot of build failures in other packages.
+# https://fedoraproject.org/wiki/Changes/AllowRemovalOfTzdata
+Requires: tzdata
+
 # Let's keep Requires and BuildRequires sorted alphabeticaly
 BuildRequires: ruby(release)
 BuildRequires: rubygems-devel