diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a146fa6..83697d0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -62,17 +62,17 @@ jobs:
           # ----
           - ARCH: arm32
             CROSS_ARCH: armhf
-            CONTAINER: ubuntu:18.04
+            CONTAINER: ubuntu:20.04
             TRIPLET: arm-linux-gnueabihf
           # ----
           - ARCH: arm64
             CROSS_ARCH: arm64
-            CONTAINER: ubuntu:18.04
+            CONTAINER: ubuntu:20.04
             TRIPLET: aarch64-linux-gnu
           # ----
           - ARCH: ppc64le
             CROSS_ARCH: ppc64el
-            CONTAINER: ubuntu:18.04
+            CONTAINER: ubuntu:20.04
             TRIPLET: powerpc64le-linux-gnu
           # ----
           - ARCH: riscv64