diff --git a/CHANGELOG b/CHANGELOG
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,10 @@
+2022-10-07 Ivan Perez <ivan.perez@keera.co.uk>
+        * Yampa.cabal: Version bump (0.13.7) (#238), add version bounds to
+          dependencies (#233).
+        * LICENSE: Update years, copyright holders (#235).
+        * src/: Update years, copyright holders (#235).
+        * .travis.yml: Update distribution to bionic (#236).
+
 2022-08-07 Ivan Perez <ivan.perez@haskell.sexy>
         * Yampa.cabal: Version bump (0.13.6) (#232).
         * src/: Fix typos in documentation (#224), replace AFRP with Yampa
diff --git a/LICENSE b/LICENSE
--- a/LICENSE
+++ b/LICENSE
@@ -1,4 +1,7 @@
-Copyright (c) 2003, Henrik Nilsson, Antony Courtney and Yale University.
+Copyright (c) 2014-2022, Ivan Perez
+Copyright (c) 2007-2012, George Griogidge
+Copyright (c) 2005-2006, Henrik Nilsson
+Copyright (c) 2003-2004, Henrik Nilsson, Antony Courtney and Yale University.
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
diff --git a/Yampa.cabal b/Yampa.cabal
--- a/Yampa.cabal
+++ b/Yampa.cabal
@@ -30,7 +30,7 @@
 build-type:    Simple
 
 name:          Yampa
-version:       0.13.6
+version:       0.13.7
 author:        Henrik Nilsson, Antony Courtney
 maintainer:    Ivan Perez (ivan.perez@keera.co.uk)
 homepage:      https://github.com/ivanperez-keera/Yampa/
@@ -99,10 +99,11 @@
 
   build-depends:
       base < 6
-    , deepseq
-    , random
-    , simple-affine-space
 
+    , deepseq             >= 1.3.0.1 && < 1.5
+    , random              >= 1.1     && < 1.3
+    , simple-affine-space >= 0.1     && < 0.2
+
   default-language:
     Haskell2010
 
@@ -135,7 +136,8 @@
       False
   else
     build-depends:
-        base
+        base >= 4 && < 5
+
       , hlint >= 1.7
 
 -- Verify that the code is thoroughly documented
@@ -161,12 +163,13 @@
   else
     build-depends:
         base >= 4 && < 5
-      , directory
-      , filepath
-      , process
-      , regex-posix
 
+      , directory    >= 1.2     && < 1.4
+      , filepath     >= 1.3.0.1 && < 1.5
+      , process      >= 1.1.0.2 && < 1.7
+      , regex-posix  >= 0.95    && < 0.97
 
+
 executable yampa-examples-sdl-bouncingbox
   main-is:
     MainBouncingBox.hs
@@ -188,9 +191,10 @@
       True
     build-depends:
         base < 5
-      , deepseq
-      , random
-      , SDL
+
+      , deepseq >= 1.3.0.1 && < 1.5
+      , random  >= 1.1     && < 1.3
+      , SDL     >= 0.6     && < 0.7
       , Yampa
   else
     buildable:
@@ -218,9 +222,10 @@
       True
     build-depends:
         base < 5
-      , deepseq
-      , random
-      , SDL
+
+      , deepseq >= 1.3.0.1 && < 1.5
+      , random  >= 1.1     && < 1.3
+      , SDL     >= 0.6     && < 0.7
       , Yampa
   else
     buildable:
@@ -248,10 +253,11 @@
       True
     build-depends:
         base < 5
-      , deepseq
-      , hcwiid
-      , random
-      , SDL
+
+      , deepseq >= 1.3.0.1 && < 1.5
+      , hcwiid  >= 0.0.5   && < 0.1
+      , random  >= 1.1     && < 1.3
+      , SDL     >= 0.6     && < 0.7
       , Yampa
   else
     buildable:
diff --git a/src/FRP/Yampa.hs b/src/FRP/Yampa.hs
--- a/src/FRP/Yampa.hs
+++ b/src/FRP/Yampa.hs
@@ -1,6 +1,9 @@
 -- |
 -- Module      :  FRP.Yampa
--- Copyright   :  (c) Antony Courtney and Henrik Nilsson, Yale University, 2003
+-- Copyright   :  (c) Ivan Perez, 2014-2022
+--                (c) George Giorgidze, 2007-2012
+--                (c) Henrik Nilsson, 2005-2006
+--                (c) Antony Courtney and Henrik Nilsson, Yale University, 2003-2004
 -- License     :  BSD-style (see the LICENSE file in the distribution)
 --
 -- Maintainer  :  ivan.perez@keera.co.uk
diff --git a/src/FRP/Yampa/Arrow.hs b/src/FRP/Yampa/Arrow.hs
--- a/src/FRP/Yampa/Arrow.hs
+++ b/src/FRP/Yampa/Arrow.hs
@@ -1,6 +1,9 @@
 -- |
 -- Module      :  FRP.Yampa.Arrow
--- Copyright   :  (c) Antony Courtney and Henrik Nilsson, Yale University, 2003
+-- Copyright   :  (c) Ivan Perez, 2014-2022
+--                (c) George Giorgidze, 2007-2012
+--                (c) Henrik Nilsson, 2005-2006
+--                (c) Antony Courtney and Henrik Nilsson, Yale University, 2003-2004
 -- License     :  BSD-style (see the LICENSE file in the distribution)
 --
 -- Maintainer  :  ivan.perez@keera.co.uk
diff --git a/src/FRP/Yampa/Basic.hs b/src/FRP/Yampa/Basic.hs
--- a/src/FRP/Yampa/Basic.hs
+++ b/src/FRP/Yampa/Basic.hs
@@ -1,6 +1,9 @@
 -- |
 -- Module      :  FRP.Yampa.Basic
--- Copyright   :  (c) Antony Courtney and Henrik Nilsson, Yale University, 2003
+-- Copyright   :  (c) Ivan Perez, 2014-2022
+--                (c) George Giorgidze, 2007-2012
+--                (c) Henrik Nilsson, 2005-2006
+--                (c) Antony Courtney and Henrik Nilsson, Yale University, 2003-2004
 -- License     :  BSD-style (see the LICENSE file in the distribution)
 --
 -- Maintainer  :  ivan.perez@keera.co.uk
diff --git a/src/FRP/Yampa/Conditional.hs b/src/FRP/Yampa/Conditional.hs
--- a/src/FRP/Yampa/Conditional.hs
+++ b/src/FRP/Yampa/Conditional.hs
@@ -1,6 +1,9 @@
 -- |
 -- Module      :  FRP.Yampa
--- Copyright   :  (c) Antony Courtney and Henrik Nilsson, Yale University, 2003
+-- Copyright   :  (c) Ivan Perez, 2014-2022
+--                (c) George Giorgidze, 2007-2012
+--                (c) Henrik Nilsson, 2005-2006
+--                (c) Antony Courtney and Henrik Nilsson, Yale University, 2003-2004
 -- License     :  BSD-style (see the LICENSE file in the distribution)
 --
 -- Maintainer  :  ivan.perez@keera.co.uk
diff --git a/src/FRP/Yampa/Delays.hs b/src/FRP/Yampa/Delays.hs
--- a/src/FRP/Yampa/Delays.hs
+++ b/src/FRP/Yampa/Delays.hs
@@ -1,6 +1,9 @@
 -- |
 -- Module      :  FRP.Yampa.Delays
--- Copyright   :  (c) Antony Courtney and Henrik Nilsson, Yale University, 2003
+-- Copyright   :  (c) Ivan Perez, 2014-2022
+--                (c) George Giorgidze, 2007-2012
+--                (c) Henrik Nilsson, 2005-2006
+--                (c) Antony Courtney and Henrik Nilsson, Yale University, 2003-2004
 -- License     :  BSD-style (see the LICENSE file in the distribution)
 --
 -- Maintainer  :  ivan.perez@keera.co.uk
diff --git a/src/FRP/Yampa/Diagnostics.hs b/src/FRP/Yampa/Diagnostics.hs
--- a/src/FRP/Yampa/Diagnostics.hs
+++ b/src/FRP/Yampa/Diagnostics.hs
@@ -1,6 +1,9 @@
 -- |
 -- Module      :  FRP.Yampa.Diagnostics
--- Copyright   :  (c) Antony Courtney and Henrik Nilsson, Yale University, 2003
+-- Copyright   :  (c) Ivan Perez, 2014-2022
+--                (c) George Giorgidze, 2007-2012
+--                (c) Henrik Nilsson, 2005-2006
+--                (c) Antony Courtney and Henrik Nilsson, Yale University, 2003-2004
 -- License     :  BSD-style (see the LICENSE file in the distribution)
 --
 -- Maintainer  :  ivan.perez@keera.co.uk
diff --git a/src/FRP/Yampa/Event.hs b/src/FRP/Yampa/Event.hs
--- a/src/FRP/Yampa/Event.hs
+++ b/src/FRP/Yampa/Event.hs
@@ -2,7 +2,10 @@
 {-# OPTIONS_GHC -fno-warn-warnings-deprecations #-}
 -- |
 -- Module      : FRP.Yampa.Event
--- Copyright   : (c) Antony Courtney and Henrik Nilsson, Yale University, 2003
+-- Copyright   : (c) Ivan Perez, 2014-2022
+--               (c) George Giorgidze, 2007-2012
+--               (c) Henrik Nilsson, 2005-2006
+--               (c) Antony Courtney and Henrik Nilsson, Yale University, 2003-2004
 -- License     : BSD-style (see the LICENSE file in the distribution)
 --
 -- Maintainer  : ivan.perez@keera.co.uk
diff --git a/src/FRP/Yampa/EventS.hs b/src/FRP/Yampa/EventS.hs
--- a/src/FRP/Yampa/EventS.hs
+++ b/src/FRP/Yampa/EventS.hs
@@ -1,6 +1,9 @@
 -- |
 -- Module      :  FRP.Yampa.EventS
--- Copyright   :  (c) Antony Courtney and Henrik Nilsson, Yale University, 2003
+-- Copyright   :  (c) Ivan Perez, 2014-2022
+--                (c) George Giorgidze, 2007-2012
+--                (c) Henrik Nilsson, 2005-2006
+--                (c) Antony Courtney and Henrik Nilsson, Yale University, 2003-2004
 -- License     :  BSD-style (see the LICENSE file in the distribution)
 --
 -- Maintainer  :  ivan.perez@keera.co.uk
diff --git a/src/FRP/Yampa/Hybrid.hs b/src/FRP/Yampa/Hybrid.hs
--- a/src/FRP/Yampa/Hybrid.hs
+++ b/src/FRP/Yampa/Hybrid.hs
@@ -1,6 +1,9 @@
 -- |
 -- Module      :  FRP.Yampa.Hybrid
--- Copyright   :  (c) Antony Courtney and Henrik Nilsson, Yale University, 2003
+-- Copyright   :  (c) Ivan Perez, 2014-2022
+--                (c) George Giorgidze, 2007-2012
+--                (c) Henrik Nilsson, 2005-2006
+--                (c) Antony Courtney and Henrik Nilsson, Yale University, 2003-2004
 -- License     :  BSD-style (see the LICENSE file in the distribution)
 --
 -- Maintainer  :  ivan.perez@keera.co.uk
diff --git a/src/FRP/Yampa/Integration.hs b/src/FRP/Yampa/Integration.hs
--- a/src/FRP/Yampa/Integration.hs
+++ b/src/FRP/Yampa/Integration.hs
@@ -1,6 +1,9 @@
 -- |
 -- Module      :  FRP.Yampa.Integration
--- Copyright   :  (c) Antony Courtney and Henrik Nilsson, Yale University, 2003
+-- Copyright   :  (c) Ivan Perez, 2014-2022
+--                (c) George Giorgidze, 2007-2012
+--                (c) Henrik Nilsson, 2005-2006
+--                (c) Antony Courtney and Henrik Nilsson, Yale University, 2003-2004
 -- License     :  BSD-style (see the LICENSE file in the distribution)
 --
 -- Maintainer  :  ivan.perez@keera.co.uk
diff --git a/src/FRP/Yampa/InternalCore.hs b/src/FRP/Yampa/InternalCore.hs
--- a/src/FRP/Yampa/InternalCore.hs
+++ b/src/FRP/Yampa/InternalCore.hs
@@ -2,7 +2,10 @@
 {-# LANGUAGE GADTs #-}
 -- |
 -- Module      :  FRP.Yampa
--- Copyright   :  (c) Antony Courtney and Henrik Nilsson, Yale University, 2003
+-- Copyright   :  (c) Ivan Perez, 2014-2022
+--                (c) George Giorgidze, 2007-2012
+--                (c) Henrik Nilsson, 2005-2006
+--                (c) Antony Courtney and Henrik Nilsson, Yale University, 2003-2004
 -- License     :  BSD-style (see the LICENSE file in the distribution)
 --
 -- Maintainer  :  ivan.perez@keera.co.uk
diff --git a/src/FRP/Yampa/Loop.hs b/src/FRP/Yampa/Loop.hs
--- a/src/FRP/Yampa/Loop.hs
+++ b/src/FRP/Yampa/Loop.hs
@@ -1,6 +1,9 @@
 -- |
 -- Module      :  FRP.Yampa.Loop
--- Copyright   :  (c) Antony Courtney and Henrik Nilsson, Yale University, 2003
+-- Copyright   :  (c) Ivan Perez, 2014-2022
+--                (c) George Giorgidze, 2007-2012
+--                (c) Henrik Nilsson, 2005-2006
+--                (c) Antony Courtney and Henrik Nilsson, Yale University, 2003-2004
 -- License     :  BSD-style (see the LICENSE file in the distribution)
 --
 -- Maintainer  :  ivan.perez@keera.co.uk
diff --git a/src/FRP/Yampa/Random.hs b/src/FRP/Yampa/Random.hs
--- a/src/FRP/Yampa/Random.hs
+++ b/src/FRP/Yampa/Random.hs
@@ -1,6 +1,9 @@
 -- |
 -- Module      :  FRP.Yampa.Random
--- Copyright   :  (c) Antony Courtney and Henrik Nilsson, Yale University, 2003
+-- Copyright   :  (c) Ivan Perez, 2014-2022
+--                (c) George Giorgidze, 2007-2012
+--                (c) Henrik Nilsson, 2005-2006
+--                (c) Antony Courtney and Henrik Nilsson, Yale University, 2003-2004
 -- License     :  BSD-style (see the LICENSE file in the distribution)
 --
 -- Maintainer  :  ivan.perez@keera.co.uk
diff --git a/src/FRP/Yampa/Scan.hs b/src/FRP/Yampa/Scan.hs
--- a/src/FRP/Yampa/Scan.hs
+++ b/src/FRP/Yampa/Scan.hs
@@ -1,6 +1,9 @@
 -- |
 -- Module      :  FRP.Yampa.Scan
--- Copyright   :  (c) Antony Courtney and Henrik Nilsson, Yale University, 2003
+-- Copyright   :  (c) Ivan Perez, 2014-2022
+--                (c) George Giorgidze, 2007-2012
+--                (c) Henrik Nilsson, 2005-2006
+--                (c) Antony Courtney and Henrik Nilsson, Yale University, 2003-2004
 -- License     :  BSD-style (see the LICENSE file in the distribution)
 --
 -- Maintainer  :  ivan.perez@keera.co.uk
diff --git a/src/FRP/Yampa/Simulation.hs b/src/FRP/Yampa/Simulation.hs
--- a/src/FRP/Yampa/Simulation.hs
+++ b/src/FRP/Yampa/Simulation.hs
@@ -1,6 +1,9 @@
 -- |
 -- Module      :  FRP.Yampa.Simulation
--- Copyright   :  (c) Antony Courtney and Henrik Nilsson, Yale University, 2003
+-- Copyright   :  (c) Ivan Perez, 2014-2022
+--                (c) George Giorgidze, 2007-2012
+--                (c) Henrik Nilsson, 2005-2006
+--                (c) Antony Courtney and Henrik Nilsson, Yale University, 2003-2004
 -- License     :  BSD-style (see the LICENSE file in the distribution)
 --
 -- Maintainer  :  ivan.perez@keera.co.uk
diff --git a/src/FRP/Yampa/Switches.hs b/src/FRP/Yampa/Switches.hs
--- a/src/FRP/Yampa/Switches.hs
+++ b/src/FRP/Yampa/Switches.hs
@@ -1,7 +1,10 @@
 {-# LANGUAGE Rank2Types #-}
 -- |
 -- Module      :  FRP.Yampa.Switches
--- Copyright   :  (c) Antony Courtney and Henrik Nilsson, Yale University, 2003
+-- Copyright   :  (c) Ivan Perez, 2014-2022
+--                (c) George Giorgidze, 2007-2012
+--                (c) Henrik Nilsson, 2005-2006
+--                (c) Antony Courtney and Henrik Nilsson, Yale University, 2003-2004
 -- License     :  BSD-style (see the LICENSE file in the distribution)
 --
 -- Maintainer  :  ivan.perez@keera.co.uk
diff --git a/src/FRP/Yampa/Task.hs b/src/FRP/Yampa/Task.hs
--- a/src/FRP/Yampa/Task.hs
+++ b/src/FRP/Yampa/Task.hs
@@ -2,7 +2,10 @@
 {-# LANGUAGE Rank2Types #-}
 -- |
 -- Module      :  FRP.Yampa.Task
--- Copyright   :  (c) Antony Courtney and Henrik Nilsson, Yale University, 2003
+-- Copyright   :  (c) Ivan Perez, 2014-2022
+--                (c) George Giorgidze, 2007-2012
+--                (c) Henrik Nilsson, 2005-2006
+--                (c) Antony Courtney and Henrik Nilsson, Yale University, 2003-2004
 -- License     :  BSD-style (see the LICENSE file in the distribution)
 --
 -- Maintainer  :  ivan.perez@keera.co.uk
diff --git a/src/FRP/Yampa/Time.hs b/src/FRP/Yampa/Time.hs
--- a/src/FRP/Yampa/Time.hs
+++ b/src/FRP/Yampa/Time.hs
@@ -1,6 +1,9 @@
 -- |
 -- Module      :  FRP.Yampa.Time
--- Copyright   :  (c) Antony Courtney and Henrik Nilsson, Yale University, 2003
+-- Copyright   :  (c) Ivan Perez, 2014-2022
+--                (c) George Giorgidze, 2007-2012
+--                (c) Henrik Nilsson, 2005-2006
+--                (c) Antony Courtney and Henrik Nilsson, Yale University, 2003-2004
 -- License     :  BSD-style (see the LICENSE file in the distribution)
 --
 -- Maintainer  :  ivan.perez@keera.co.uk
