diff --git a/db/migrate/20191018010553_create_sequences.rb b/db/migrate/20191018010553_create_sequences.rb
index 25120f7..7f69a71 100644
--- a/db/migrate/20191018010553_create_sequences.rb
+++ b/db/migrate/20191018010553_create_sequences.rb
@@ -1,4 +1,4 @@
-class CreateSequences < ActiveRecord::Migration
+class CreateSequences < ActiveRecord::Migration[4.2]
   def change
     create_table :sequences do |t|
       t.string :gbif_id
diff --git a/db/migrate/20200214162752_rename_sequences_to_occurrences.rb b/db/migrate/20200214162752_rename_sequences_to_occurrences.rb
index d4abdc7..580a003 100644
--- a/db/migrate/20200214162752_rename_sequences_to_occurrences.rb
+++ b/db/migrate/20200214162752_rename_sequences_to_occurrences.rb
@@ -1,4 +1,4 @@
-class RenameSequencesToOccurrences < ActiveRecord::Migration
+class RenameSequencesToOccurrences < ActiveRecord::Migration[4.2]
   def change
     rename_table :sequences, :occurrences
   end
diff --git a/db/migrate/20200214163119_add_columns_to_occurrences.rb b/db/migrate/20200214163119_add_columns_to_occurrences.rb
index 1be713a..201461d 100644
--- a/db/migrate/20200214163119_add_columns_to_occurrences.rb
+++ b/db/migrate/20200214163119_add_columns_to_occurrences.rb
@@ -1,4 +1,4 @@
-class AddColumnsToOccurrences < ActiveRecord::Migration
+class AddColumnsToOccurrences < ActiveRecord::Migration[4.2]
   def change
     add_column :occurrences, :basis_of_record, :string
     add_column :occurrences, :geodetic_datum, :string
diff --git a/db/migrate/20200214163715_remove_sequences_from_occurrences.rb b/db/migrate/20200214163715_remove_sequences_from_occurrences.rb
index 7143483..014d52f 100644
--- a/db/migrate/20200214163715_remove_sequences_from_occurrences.rb
+++ b/db/migrate/20200214163715_remove_sequences_from_occurrences.rb
@@ -1,4 +1,4 @@
-class RemoveSequencesFromOccurrences < ActiveRecord::Migration
+class RemoveSequencesFromOccurrences < ActiveRecord::Migration[4.2]
   def change
     remove_column :occurrences, :gene_name, :string
     remove_column :occurrences, :sequence, :text
diff --git a/db/migrate/20200214164035_add_genes_table.rb b/db/migrate/20200214164035_add_genes_table.rb
index 1ce4f4b..2e31caf 100644
--- a/db/migrate/20200214164035_add_genes_table.rb
+++ b/db/migrate/20200214164035_add_genes_table.rb
@@ -1,4 +1,4 @@
-class AddGenesTable < ActiveRecord::Migration
+class AddGenesTable < ActiveRecord::Migration[4.2]
   def change
     create_table :genes do |t|
       t.string   "accession"
diff --git a/db/migrate/20200214210151_add_symbol_to_genes.rb b/db/migrate/20200214210151_add_symbol_to_genes.rb
index f97ea91..c514e62 100644
--- a/db/migrate/20200214210151_add_symbol_to_genes.rb
+++ b/db/migrate/20200214210151_add_symbol_to_genes.rb
@@ -1,4 +1,4 @@
-class AddSymbolToGenes < ActiveRecord::Migration
+class AddSymbolToGenes < ActiveRecord::Migration[4.2]
   def change
     add_column :genes, :symbol, :string
   end
diff --git a/db/migrate/20200214212822_add_subspecies_to_occurrence.rb b/db/migrate/20200214212822_add_subspecies_to_occurrence.rb
index babe9bc..292aaae 100644
--- a/db/migrate/20200214212822_add_subspecies_to_occurrence.rb
+++ b/db/migrate/20200214212822_add_subspecies_to_occurrence.rb
@@ -1,4 +1,4 @@
-class AddSubspeciesToOccurrence < ActiveRecord::Migration
+class AddSubspeciesToOccurrence < ActiveRecord::Migration[4.2]
   def change
     add_column :occurrences, :taxon_subspecies, :string
   end
diff --git a/db/migrate/20200217232936_recreated_tables_to_fix_order.rb b/db/migrate/20200217232936_recreated_tables_to_fix_order.rb
index 58c3acd..7de446b 100644
--- a/db/migrate/20200217232936_recreated_tables_to_fix_order.rb
+++ b/db/migrate/20200217232936_recreated_tables_to_fix_order.rb
@@ -1,4 +1,4 @@
-class RecreatedTablesToFixOrder < ActiveRecord::Migration
+class RecreatedTablesToFixOrder < ActiveRecord::Migration[4.2]
   def change
     create_table "occurrences", force: true do |t|
       t.string   "accession"
diff --git a/db/migrate/20200217233426_add_indexes.rb b/db/migrate/20200217233426_add_indexes.rb
index 1c93cac..4a5e13b 100644
--- a/db/migrate/20200217233426_add_indexes.rb
+++ b/db/migrate/20200217233426_add_indexes.rb
@@ -1,4 +1,4 @@
-class AddIndexes < ActiveRecord::Migration
+class AddIndexes < ActiveRecord::Migration[4.2]
   def change
     change_table(:occurrences) do |t|
       t.index :lat
diff --git a/db/migrate/20200218001221_add_indexes_to_accession.rb b/db/migrate/20200218001221_add_indexes_to_accession.rb
index ca63500..c62148d 100644
--- a/db/migrate/20200218001221_add_indexes_to_accession.rb
+++ b/db/migrate/20200218001221_add_indexes_to_accession.rb
@@ -1,4 +1,4 @@
-class AddIndexesToAccession < ActiveRecord::Migration
+class AddIndexesToAccession < ActiveRecord::Migration[4.2]
   def change
     add_index :genes, :accession
     add_index :occurrences, :accession
diff --git a/db/migrate/20200602200443_add_taxon_occurrence_species_to_gene.rb b/db/migrate/20200602200443_add_taxon_occurrence_species_to_gene.rb
index faf5997..7d13d04 100644
--- a/db/migrate/20200602200443_add_taxon_occurrence_species_to_gene.rb
+++ b/db/migrate/20200602200443_add_taxon_occurrence_species_to_gene.rb
@@ -1,4 +1,4 @@
-class AddTaxonOccurrenceSpeciesToGene < ActiveRecord::Migration
+class AddTaxonOccurrenceSpeciesToGene < ActiveRecord::Migration[4.2]
   def change
     add_column :genes, :taxon_occurrence_species, :string
     add_index :genes, :taxon_occurrence_species
diff --git a/db/migrate/20200603011127_add_species_path_to_gene.rb b/db/migrate/20200603011127_add_species_path_to_gene.rb
index 6b140e0..6ba0847 100644
--- a/db/migrate/20200603011127_add_species_path_to_gene.rb
+++ b/db/migrate/20200603011127_add_species_path_to_gene.rb
@@ -1,4 +1,4 @@
-class AddSpeciesPathToGene < ActiveRecord::Migration
+class AddSpeciesPathToGene < ActiveRecord::Migration[4.2]
   def change
     add_column :genes, :species_path, :string
   end
diff --git a/db/migrate/20200603194212_add_genbank_cols_to_occurrences.rb b/db/migrate/20200603194212_add_genbank_cols_to_occurrences.rb
index 70c1bdf..4e354dd 100644
--- a/db/migrate/20200603194212_add_genbank_cols_to_occurrences.rb
+++ b/db/migrate/20200603194212_add_genbank_cols_to_occurrences.rb
@@ -1,4 +1,4 @@
-class AddGenbankColsToOccurrences < ActiveRecord::Migration
+class AddGenbankColsToOccurrences < ActiveRecord::Migration[4.2]
   def change
     add_column :occurrences, :different_genbank_species, :string
     add_column :occurrences, :species_path, :string
diff --git a/db/migrate/20200605143151_rename_base_pairs_column.rb b/db/migrate/20200605143151_rename_base_pairs_column.rb
index d9ac7ba..b7dc726 100644
--- a/db/migrate/20200605143151_rename_base_pairs_column.rb
+++ b/db/migrate/20200605143151_rename_base_pairs_column.rb
@@ -1,4 +1,4 @@
-class RenameBasePairsColumn < ActiveRecord::Migration
+class RenameBasePairsColumn < ActiveRecord::Migration[4.2]
   def change
     rename_column :occurrences, :species_total_base_pairs, :species_total_bytes
   end
diff --git a/db/migrate/20200605151757_add_index_to_species_path.rb b/db/migrate/20200605151757_add_index_to_species_path.rb
index 59a2021..a2b272b 100644
--- a/db/migrate/20200605151757_add_index_to_species_path.rb
+++ b/db/migrate/20200605151757_add_index_to_species_path.rb
@@ -1,4 +1,4 @@
-class AddIndexToSpeciesPath < ActiveRecord::Migration
+class AddIndexToSpeciesPath < ActiveRecord::Migration[4.2]
   def change
     add_index :occurrences, :species_path
   end
diff --git a/db/migrate/20200607013731_add_aligned_to_occurrences.rb b/db/migrate/20200607013731_add_aligned_to_occurrences.rb
index 463ab56..ab68a7b 100644
--- a/db/migrate/20200607013731_add_aligned_to_occurrences.rb
+++ b/db/migrate/20200607013731_add_aligned_to_occurrences.rb
@@ -1,4 +1,4 @@
-class AddAlignedToOccurrences < ActiveRecord::Migration
+class AddAlignedToOccurrences < ActiveRecord::Migration[4.2]
   def change
     add_column :occurrences, :species_aligned, :boolean 
     add_index :occurrences, :species_aligned
diff --git a/db/migrate/20210107150657_drop_genes_table.rb b/db/migrate/20210107150657_drop_genes_table.rb
index 290f7b7..c2070e4 100644
--- a/db/migrate/20210107150657_drop_genes_table.rb
+++ b/db/migrate/20210107150657_drop_genes_table.rb
@@ -1,4 +1,4 @@
-class DropGenesTable < ActiveRecord::Migration
+class DropGenesTable < ActiveRecord::Migration[4.2]
   def change
     drop_table :genes
   end
diff --git a/db/migrate/20210107150849_add_species_and_files.rb b/db/migrate/20210107150849_add_species_and_files.rb
index 7e764bf..7a8d8be 100644
--- a/db/migrate/20210107150849_add_species_and_files.rb
+++ b/db/migrate/20210107150849_add_species_and_files.rb
@@ -1,4 +1,4 @@
-class AddSpeciesAndFiles < ActiveRecord::Migration
+class AddSpeciesAndFiles < ActiveRecord::Migration[4.2]
   def change
     create_table :species do |t|
       t.string :path
diff --git a/db/migrate/20210107164308_remove_old_species_cols_from_occurrences.rb b/db/migrate/20210107164308_remove_old_species_cols_from_occurrences.rb
index 81fbd26..5157dc5 100644
--- a/db/migrate/20210107164308_remove_old_species_cols_from_occurrences.rb
+++ b/db/migrate/20210107164308_remove_old_species_cols_from_occurrences.rb
@@ -1,4 +1,4 @@
-class RemoveOldSpeciesColsFromOccurrences < ActiveRecord::Migration
+class RemoveOldSpeciesColsFromOccurrences < ActiveRecord::Migration[4.2]
   def change
     remove_column :occurrences, :species_max_seqs_per_gene
     remove_column :occurrences, :species_total_seqs
diff --git a/db/migrate/20210115215723_move_taxon_to_species.rb b/db/migrate/20210115215723_move_taxon_to_species.rb
index dc74313..f102884 100644
--- a/db/migrate/20210115215723_move_taxon_to_species.rb
+++ b/db/migrate/20210115215723_move_taxon_to_species.rb
@@ -1,4 +1,4 @@
-class MoveTaxonToSpecies < ActiveRecord::Migration
+class MoveTaxonToSpecies < ActiveRecord::Migration[4.2]
   def change
     change_table :occurrences do |t|
       t.remove :taxon_kingdom
diff --git a/db/migrate/20210119155152_add_source_to_occurrence.rb b/db/migrate/20210119155152_add_source_to_occurrence.rb
index f0e6f72..24e10a5 100644
--- a/db/migrate/20210119155152_add_source_to_occurrence.rb
+++ b/db/migrate/20210119155152_add_source_to_occurrence.rb
@@ -1,4 +1,4 @@
-class AddSourceToOccurrence < ActiveRecord::Migration
+class AddSourceToOccurrence < ActiveRecord::Migration[4.2]
   def change
     add_column :occurrences, :source, :integer, default: 0
     add_index :occurrences, :source
diff --git a/db/migrate/20210120032032_rename_gbifid_to_sourceid.rb b/db/migrate/20210120032032_rename_gbifid_to_sourceid.rb
index 13f9d10..cd6dd91 100644
--- a/db/migrate/20210120032032_rename_gbifid_to_sourceid.rb
+++ b/db/migrate/20210120032032_rename_gbifid_to_sourceid.rb
@@ -1,4 +1,4 @@
-class RenameGbifidToSourceid < ActiveRecord::Migration
+class RenameGbifidToSourceid < ActiveRecord::Migration[4.2]
   def change
     rename_column :occurrences, :gbif_id, :source_id
   end
diff --git a/db/migrate/20210120032223_add_fields_to_occurrences.rb b/db/migrate/20210120032223_add_fields_to_occurrences.rb
index 65ea8f1..d7719f6 100644
--- a/db/migrate/20210120032223_add_fields_to_occurrences.rb
+++ b/db/migrate/20210120032223_add_fields_to_occurrences.rb
@@ -1,4 +1,4 @@
-class AddFieldsToOccurrences < ActiveRecord::Migration
+class AddFieldsToOccurrences < ActiveRecord::Migration[4.2]
   def change
     change_table :occurrences do |t|
       t.string :field_number
diff --git a/db/migrate/20210122011413_change_sourceid_to_string.rb b/db/migrate/20210122011413_change_sourceid_to_string.rb
index 944ee4b..fd57ada 100644
--- a/db/migrate/20210122011413_change_sourceid_to_string.rb
+++ b/db/migrate/20210122011413_change_sourceid_to_string.rb
@@ -1,4 +1,4 @@
-class ChangeSourceidToString < ActiveRecord::Migration
+class ChangeSourceidToString < ActiveRecord::Migration[4.2]
   def change
     change_column :occurrences, :source_id, :string
   end
diff --git a/db/migrate/20210426211251_remove_geodetic_datum_from_occurrences.rb b/db/migrate/20210426211251_remove_geodetic_datum_from_occurrences.rb
index b3b2b6a..ded95c0 100644
--- a/db/migrate/20210426211251_remove_geodetic_datum_from_occurrences.rb
+++ b/db/migrate/20210426211251_remove_geodetic_datum_from_occurrences.rb
@@ -1,4 +1,4 @@
-class RemoveGeodeticDatumFromOccurrences < ActiveRecord::Migration
+class RemoveGeodeticDatumFromOccurrences < ActiveRecord::Migration[4.2]
   def change
     remove_column :occurrences, :geodetic_datum
   end
diff --git a/db/migrate/20210429010049_add_genes_to_occurrences.rb b/db/migrate/20210429010049_add_genes_to_occurrences.rb
index 5bf0b02..0feb3ad 100644
--- a/db/migrate/20210429010049_add_genes_to_occurrences.rb
+++ b/db/migrate/20210429010049_add_genes_to_occurrences.rb
@@ -1,4 +1,4 @@
-class AddGenesToOccurrences < ActiveRecord::Migration
+class AddGenesToOccurrences < ActiveRecord::Migration[4.2]
   def change
     add_column :occurrences, :genes, :text
   end
diff --git a/db/migrate/20210515133101_add_flag_to_occurrences.rb b/db/migrate/20210515133101_add_flag_to_occurrences.rb
index 2f4a16d..91b6036 100644
--- a/db/migrate/20210515133101_add_flag_to_occurrences.rb
+++ b/db/migrate/20210515133101_add_flag_to_occurrences.rb
@@ -1,4 +1,4 @@
-class AddFlagToOccurrences < ActiveRecord::Migration
+class AddFlagToOccurrences < ActiveRecord::Migration[4.2]
   def change
     add_column :occurrences, :flag, :string
   end