diff --git a/Gemfile.lock b/Gemfile.lock
index 825146d2c4b6affb5f2423e3461866e60c3e3659..4a14514e3a42bd3dad67246b4a7280244ab7eda5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -4,6 +4,7 @@ GIT
   ref: e65246bea49374566a9dbaead59fdb35b46b086d
   specs:
     hcaptcha (6.0.1)
+      json
 
 GIT
   remote: https://github.com/ianheggie/health_check
@@ -266,8 +267,6 @@ GEM
       activesupport (>= 4.0.1)
       hamlit (>= 1.2.0)
       railties (>= 4.0.1)
-    hamster (3.0.0)
-      concurrent-ruby (~> 1.0)
     hashdiff (1.0.1)
     hashie (4.1.0)
     highline (2.0.3)
@@ -486,8 +485,7 @@ GEM
       thor (>= 0.19.0, < 2.0)
     rainbow (3.0.0)
     rake (13.0.1)
-    rdf (3.1.4)
-      hamster (~> 3.0)
+    rdf (3.2.9)
       link_header (~> 0.0, >= 0.0.8)
     rdf-normalize (0.4.0)
       rdf (~> 3.1)