diff --git a/docker/Dockerfile b/docker/Dockerfile
index e956415f..fd98735d 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -2,7 +2,7 @@
 ARG OPENSSL_VERSION='3.6.3'
 ARG OPENSSL_SHA256='243a86649cf6f23eeb6a2ff2456e09e5d77dd9018a54d3d96b0c6bdd6ba6c7f1'
 
-FROM 84codes/crystal:1.20.3-alpine AS dependabot-crystal
+FROM 84codes/crystal:1.21.0-alpine AS dependabot-crystal
 
 # We compile openssl ourselves due to a memory leak in how crystal interacts
 # with openssl