diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b99ecf18..adde39c9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -40,7 +40,7 @@ jobs:
         crystal:
           - 1.0.0
           - 1.1.1
-          - 1.2.0
+          - 1.2.1
         include:
           - crystal: nightly
             stable: false
diff --git a/docker/Dockerfile b/docker/Dockerfile
index 08feb554..21d4269c 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,4 +1,4 @@
-FROM crystallang/crystal:1.1.1-alpine AS builder
+FROM crystallang/crystal:1.2.1-alpine AS builder
 RUN apk add --no-cache sqlite-static yaml-static
 
 ARG release
diff --git a/docker/Dockerfile.arm64 b/docker/Dockerfile.arm64
index 193ed09d..4fe6b1ea 100644
--- a/docker/Dockerfile.arm64
+++ b/docker/Dockerfile.arm64
@@ -1,5 +1,5 @@
 FROM alpine:edge AS builder
-RUN apk add --no-cache 'crystal=1.1.1-r1' shards sqlite-static yaml-static yaml-dev libxml2-dev zlib-static openssl-libs-static openssl-dev musl-dev
+RUN apk add --no-cache 'crystal=1.2.1-r0' shards sqlite-static yaml-static yaml-dev libxml2-dev zlib-static openssl-libs-static openssl-dev musl-dev
 
 ARG release