diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 15b9838..033229e 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
 
     container:
-      image: crystallang/crystal:0.32.1-alpine
+      image: crystallang/crystal:0.34.0-alpine
 
     steps:
     - uses: actions/checkout@v2
diff --git a/Dockerfile b/Dockerfile
index d230549..d763ddf 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM crystallang/crystal:0.32.1-alpine AS builder
+FROM crystallang/crystal:0.34.0-alpine AS builder
 
 WORKDIR /Mango
 
diff --git a/shard.yml b/shard.yml
index 8d5788a..a4696fc 100644
--- a/shard.yml
+++ b/shard.yml
@@ -8,7 +8,7 @@ targets:
   mango:
     main: src/mango.cr
 
-crystal: 0.32.1
+crystal: 0.34.0
 
 license: MIT