diff --git a/build-constraints.yaml b/build-constraints.yaml
index 85c98522..dd844ec3 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -277,7 +277,7 @@ packages:
         - warp-tls
         # - yackage # GHC 8.2.1 via yesod-form
         - yesod
-        # - yesod-auth # GHC 8.2.1 via email-validate
+        - yesod-auth
         - authenticate-oauth
         - yesod-bin
         - yesod-eventsource
@@ -380,8 +380,7 @@ packages:
         # - HaRe # via: ghc-mod
 
     "Alfredo Di Napoli <alfredo.dinapoli@gmail.com> @adinapoli":
-        []
-        # - mandrill # GHC 8.2.1 via email-validate
+        - mandrill
 
     "Jon Schoning <jonschoning@gmail.com> @jonschoning":
         - pinboard
@@ -405,11 +404,11 @@ packages:
         - tldr
         - fb
         - yesod-fb
-        # - yesod-auth-fb # GHC 8.2.1 via yesod-auth
+        - yesod-auth-fb
         - hourglass-orphans
         - wai-slack-middleware
         - sysinfo
-        # - xmonad-extras # GHC 8.2.1 via libmpd
+        - xmonad-extras
 
     "haskell-openal":
         - OpenAL
@@ -469,7 +468,7 @@ packages:
         # - labels # https://github.com/chrisdone/labels/issues/8
         - ace
         - ical
-        # - check-email # GHC 8.2.1 via email-validate
+        - check-email
         - freenect
         - frisby
         - gd
@@ -2091,7 +2090,7 @@ packages:
         - irc
 
     "Dennis Gosnell <cdep.illabout@gmail.com> @cdepillabout":
-        # - emailaddress # GHC 8.2.1 via email-validate
+        - emailaddress
         - envelope
         - from-sum
         # - hailgun # GHC 8.2.1
@@ -2883,8 +2882,7 @@ packages:
         # - dictionaries # GHC 8.2.1
 
     "Joachim Fasting <joachifm@fastmail.fm> @joachifm":
-        []
-        # - libmpd # GHC 8.2.1
+        - libmpd
 
     "Moritz Kiefer <moritz.kiefer@purelyfunctional.org> @cocreature":
         - lrucaching
@@ -3234,8 +3232,7 @@ packages:
         - shikensu
 
     "George Pollard <porges@porg.es> @Porges":
-        []
-        # - email-validate # GHC 8.2.1
+        - email-validate
 
     "Alexander Ignatyev <ignatyev.alexander@gmail.com> @alexander-ignatyev":
         - astro
@@ -3387,7 +3384,7 @@ package-flags:
         containers: true
 
     timezone-series:
-        time_1_6_and_1_7: true
+        time_1_6_and_1_7: false
         time_pre_1_6: false
 
     mintty: