diff --git a/Gemfile b/Gemfile
index aac1523..1656f62 100644
--- a/Gemfile
+++ b/Gemfile
@@ -67,7 +67,7 @@ gem "omniauth-hack_club"
 gem "faraday"
 gem "faraday-follow_redirects"
 # Phlex 2.4.1 calls JSON.fast_generate, which was removed in JSON 3.
-gem "json", "~> 2.21"
+gem "json", "~> 3.0"
 gem "pundit"
 gem "primer_view_components"
 gem "pg_search"
diff --git a/Gemfile.lock b/Gemfile.lock
index 620d2a2..bdd1061 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -195,7 +195,7 @@ GEM
       reline (>= 0.4.2)
     jb (0.8.2)
     jmespath (1.6.2)
-    json (2.21.2)
+    json (3.0.2)
     jwt (3.3.0)
       base64
     kaminari (1.2.2)
@@ -536,7 +536,7 @@ DEPENDENCIES
   hashid-rails
   high_voltage
   jb
-  json (~> 2.21)
+  json (~> 3.0)
   kaminari
   lockbox
   omniauth