diff --git a/Gemfile b/Gemfile
index a7dabdd..0eb0dcb 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,7 @@ ruby "2.6.6"
 
 source "https://rubygems.org"
 
-gem "activerecord",    "~> 6.0"
+gem "activerecord",    "~> 6.1"
 gem "deep_merge",      "~> 1.2"
 gem "nokogiri",        "~> 1.10"
 gem "parallel",        "~> 1.19"
diff --git a/Gemfile.lock b/Gemfile.lock
index 3c5aa68..5ed3c30 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,12 +1,12 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activemodel (6.1.3.2)
-      activesupport (= 6.1.3.2)
-    activerecord (6.1.3.2)
-      activemodel (= 6.1.3.2)
-      activesupport (= 6.1.3.2)
-    activesupport (6.1.3.2)
+    activemodel (6.1.7.1)
+      activesupport (= 6.1.7.1)
+    activerecord (6.1.7.1)
+      activemodel (= 6.1.7.1)
+      activesupport (= 6.1.7.1)
+    activesupport (6.1.7.1)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (>= 1.6, < 2)
       minitest (>= 5.1)
@@ -16,7 +16,7 @@ GEM
       public_suffix (>= 2.0.2, < 5.0)
     amazing_print (1.3.0)
     coderay (1.1.3)
-    concurrent-ruby (1.1.8)
+    concurrent-ruby (1.1.10)
     crack (0.4.5)
       rexml
     deep_merge (1.2.1)
@@ -28,16 +28,14 @@ GEM
       scanf (~> 1.0)
       sxp (~> 1.1)
       unicode-types (~> 1.6)
-    hamster (3.0.0)
-      concurrent-ruby (~> 1.0)
     hashdiff (1.0.1)
     htmlentities (4.3.4)
-    i18n (1.8.10)
+    i18n (1.12.0)
       concurrent-ruby (~> 1.0)
     link_header (0.0.8)
     method_source (1.0.0)
     mini_portile2 (2.5.3)
-    minitest (5.14.4)
+    minitest (5.17.0)
     nokogiri (1.11.7)
       mini_portile2 (~> 2.5.0)
       racc (~> 1.4)
@@ -48,8 +46,7 @@ GEM
       method_source (~> 1.0)
     public_suffix (4.0.6)
     racc (1.5.2)
-    rdf (3.1.14)
-      hamster (~> 3.0)
+    rdf (3.2.9)
       link_header (~> 0.0, >= 0.0.8)
     rdf-turtle (3.1.3)
       ebnf (~> 2.1)
@@ -78,7 +75,7 @@ GEM
     sxp (1.1.0)
       rdf (~> 3.1)
     timecop (0.9.4)
-    tzinfo (2.0.4)
+    tzinfo (2.0.5)
       concurrent-ruby (~> 1.0)
     unicode-types (1.6.0)
     vcr (5.1.0)
@@ -86,13 +83,13 @@ GEM
       addressable (>= 2.3.6)
       crack (>= 0.3.2)
       hashdiff (>= 0.4.0, < 2.0.0)
-    zeitwerk (2.4.2)
+    zeitwerk (2.6.6)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  activerecord (~> 6.0)
+  activerecord (~> 6.1)
   deep_merge (~> 1.2)
   nokogiri (~> 1.10)
   parallel (~> 1.19)