diff --git a/changelog b/changelog
--- a/changelog
+++ b/changelog
@@ -1,3 +1,6 @@
+1.2.1
+* Explicitly mark modules as Safe or Trustworthy
+
 1.2
 * Use universe-some-1.2, which uses a Some-type from the some-package.
 
diff --git a/src/Data/Universe.hs b/src/Data/Universe.hs
--- a/src/Data/Universe.hs
+++ b/src/Data/Universe.hs
@@ -1,5 +1,10 @@
 {-# LANGUAGE CPP #-}
 {-# LANGUAGE NoImplicitPrelude #-}
+#if __GLASGOW_HASKELL__ >=704
+{-# LANGUAGE Safe #-}
+#elif __GLASGOW_HASKELL__ >=702
+{-# LANGUAGE Trustworthy #-}
+#endif
 -- | A convenience module that imports the submodules @Instances.Base@, @Instances.Containers@,
 -- @Instances.Extended@, and @Instances.Trans@ to provide instances of
 -- 'Universe' and 'Finite' for a wide variety of types.
diff --git a/src/Data/Universe/Instances/Reverse.hs b/src/Data/Universe/Instances/Reverse.hs
--- a/src/Data/Universe/Instances/Reverse.hs
+++ b/src/Data/Universe/Instances/Reverse.hs
@@ -1,4 +1,10 @@
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE NoImplicitPrelude #-}
+#if __GLASGOW_HASKELL__ >=704
+{-# LANGUAGE Safe #-}
+#elif __GLASGOW_HASKELL__ >=702
+{-# LANGUAGE Trustworthy #-}
+#endif
 -- | A convenience module that imports the sibling modules @Eq@, @Ord@,
 -- @Show@, @Read@, and @Traversable@ to provide instances of these classes
 -- for functions over finite inputs.
diff --git a/universe.cabal b/universe.cabal
--- a/universe.cabal
+++ b/universe.cabal
@@ -1,5 +1,5 @@
 name:               universe
-version:            1.2
+version:            1.2.1
 synopsis:           A class for finite and recursively enumerable types.
 description:
   A class for finite and recursively enumerable types and some helper functions for enumerating them
@@ -22,7 +22,17 @@
 cabal-version:      >=1.10
 extra-source-files: changelog
 tested-with:
-  GHC ==8.8.1 || ==8.6.5 || ==8.4.4 || ==8.2.2 || ==8.0.2 || ==7.10.3 || ==7.8.4 || ==7.6.3 || ==7.4.2 || ==7.0.4
+  GHC ==7.0.4
+   || ==7.4.2
+   || ==7.6.3
+   || ==7.8.4
+   || ==7.10.3
+   || ==8.0.2
+   || ==8.2.2
+   || ==8.4.4
+   || ==8.6.5
+   || ==8.8.4
+   || ==8.10.3
 
 source-repository head
   type:     git
@@ -31,17 +41,24 @@
 source-repository this
   type:     git
   location: https://github.com/dmwit/universe
-  tag:      1.1
+  tag:      universe-1.2.1
 
 library
-  default-language: Haskell2010
-  hs-source-dirs:   src
+  default-language:         Haskell2010
+  hs-source-dirs:           src
   exposed-modules:
     Data.Universe
     Data.Universe.Instances.Reverse
 
   build-depends:
-      universe-base                >=1.1   && <1.1.2
-    , universe-instances-extended  >=1.1.1 && <1.1.2
-    , universe-reverse-instances   >=1.1   && <1.1.1
-    , universe-some                >=1.2   && <1.2.1
+      universe-base                >=1.1.2 && <1.1.3
+    , universe-instances-extended  >=1.1.2 && <1.1.3
+    , universe-reverse-instances   >=1.1.1 && <1.1.2
+    , universe-some                >=1.2.1 && <1.2.2
+
+  if impl(ghc >=9.0)
+    -- these flags may abort compilation with GHC-8.10
+    -- https://gitlab.haskell.org/ghc/ghc/-/merge_requests/3295
+    ghc-options: -Winferred-safe-imports -Wmissing-safe-haskell-mode
+
+  x-docspec-extra-packages: base