diff --git a/lib/ruby-pg-extras.rb b/lib/ruby-pg-extras.rb
index f3a151b..17fa80a 100644
--- a/lib/ruby-pg-extras.rb
+++ b/lib/ruby-pg-extras.rb
@@ -247,6 +247,8 @@ def self.connection
   end
 
   def self.database_url=(value)
+    @_connection&.close
+    @_connection = nil
     @@database_url = value
   end
 
diff --git a/spec/smoke_spec.rb b/spec/smoke_spec.rb
index a0599ff..2f8853f 100644
--- a/spec/smoke_spec.rb
+++ b/spec/smoke_spec.rb
@@ -65,5 +65,17 @@
         RubyPgExtras.bloat(in_format: :hash)
       end.not_to raise_error
     end
+
+    it "resets the connection when setting database URL" do
+      old_connection = RubyPgExtras.connection
+      expect(old_connection).not_to be_finished
+
+      RubyPgExtras.database_url = ENV.fetch("DATABASE_URL")
+
+      expect(old_connection).to be_finished
+      new_connection = RubyPgExtras.connection
+      expect(new_connection).not_to eq(old_connection)
+      expect(new_connection).not_to be_finished
+    end
   end
 end