diff --git a/CHANGELOG b/CHANGELOG
index 545ae42..642e08f 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,4 @@
+4.0.0 -- Remove String#% hack that would make it not blow up when using invalid keys, can temporarily restore with `FastGettext.allow_invalid_keys!`
 3.1.0 -- Work with frozen strings
 3.0.0 -- Drop ruby 2.x support
 2.4.0 -- Depend on prime gem
diff --git a/Gemfile.lock b/Gemfile.lock
index 8d9f9e1..3a2b967 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    fast_gettext (3.1.0)
+    fast_gettext (4.0.0)
       prime
 
 GEM
diff --git a/gemfiles/rails71.gemfile.lock b/gemfiles/rails71.gemfile.lock
index 3f86605..f0ac91f 100644
--- a/gemfiles/rails71.gemfile.lock
+++ b/gemfiles/rails71.gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: ..
   specs:
-    fast_gettext (3.1.0)
+    fast_gettext (4.0.0)
       prime
 
 GEM
diff --git a/lib/fast_gettext/version.rb b/lib/fast_gettext/version.rb
index 391d2c7..a3dcfa8 100644
--- a/lib/fast_gettext/version.rb
+++ b/lib/fast_gettext/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module FastGettext
-  VERSION = Version = '3.1.0' # rubocop:disable Naming/ConstantName
+  VERSION = Version = '4.0.0' # rubocop:disable Naming/ConstantName
 end