diff --git a/spec/models/json_version_spec.rb b/spec/models/json_version_spec.rb
index ac6b0cfc..694f8771 100644
--- a/spec/models/json_version_spec.rb
+++ b/spec/models/json_version_spec.rb
@@ -1,6 +1,8 @@
-if JsonVersion.table_exists?
+require 'rails_helper'
 
-  require 'rails_helper'
+# The `json_versions` table tests postgres' `json` data type. So, that
+# table is only created when testing against postgres and ActiveRecord >= 4.
+if JsonVersion.table_exists?
 
   describe JsonVersion, :type => :model do
     it "should include the `VersionConcern` module to get base functionality" do
diff --git a/test/unit/model_test.rb b/test/unit/model_test.rb
index e1c27efa..5a03f2e5 100644
--- a/test/unit/model_test.rb
+++ b/test/unit/model_test.rb
@@ -442,7 +442,7 @@ class HasPaperTrailModelTest < ActiveSupport::TestCase
     end
 
     should 'handle decimals' do
-      assert_in_delta 2.71828, @previous.a_decimal, 0.00001
+      assert_in_delta 2.7183, @previous.a_decimal, 0.0001
     end
 
     should 'handle datetimes' do
@@ -484,7 +484,7 @@ class HasPaperTrailModelTest < ActiveSupport::TestCase
         assert_equal    'The quick brown fox',       @last.reify.a_text
         assert_equal    42,                          @last.reify.an_integer
         assert_in_delta 153.01,                      @last.reify.a_float,   0.001
-        assert_in_delta 2.71828,                     @last.reify.a_decimal, 0.00001
+        assert_in_delta 2.7183,                      @last.reify.a_decimal, 0.0001
         assert_equal    @date_time.to_time.utc.to_i, @last.reify.a_datetime.to_time.utc.to_i
         assert_equal    @time.utc.to_i,              @last.reify.a_time.utc.to_i
         assert_equal    @date,                       @last.reify.a_date