diff --git a/.cirrus.yml b/.cirrus.yml
index d685749..1479c82 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -1,7 +1,7 @@
 task:
   use_compute_credits: true
   container:
-    image: ubuntu:18.04
+    image: ubuntu:20.04
     cpu: 1
     memory: 2G
   timeout_in: 20m
diff --git a/snap/snapcraft.yaml b/snap/snapcraft.yaml
index c3bdc28..f1ad768 100644
--- a/snap/snapcraft.yaml
+++ b/snap/snapcraft.yaml
@@ -1,5 +1,5 @@
 name: bitcoin-core
-version: '27.0'
+version: '28.0'
 summary: Fully validating Bitcoin peer-to-peer network node, wallet and GUI
 description: |
   Bitcoin Core connects to the Bitcoin peer-to-peer network to download and
@@ -8,7 +8,7 @@ description: |
 
 grade: stable
 confinement: strict
-base: core18
+base: core20
 
 apps:
   daemon:
@@ -84,7 +84,7 @@ parts:
       wget https://bitcoincore.org/bin/bitcoin-core-${SNAPCRAFT_PROJECT_VERSION}/SHA256SUMS
       wget https://bitcoincore.org/bin/bitcoin-core-${SNAPCRAFT_PROJECT_VERSION}/bitcoin-${SNAPCRAFT_PROJECT_VERSION}.tar.gz
       wget https://bitcoincore.org/bin/bitcoin-core-${SNAPCRAFT_PROJECT_VERSION}/bitcoin-${SNAPCRAFT_PROJECT_VERSION}-${SNAPCRAFT_ARCH_TRIPLET}.tar.gz
-      echo "4bc7c97684a0bd1ba000f64f7a24c49302bcbd716eacb134b972188e0379a415  SHA256SUMS" | sha256sum --check
+      echo "d1384c7cbb9027bc5642943d675d25f2edd88e34207e0aaa307babf097d6d023  SHA256SUMS" | sha256sum --check
       sha256sum --ignore-missing --check SHA256SUMS
       tar -xvf bitcoin-${SNAPCRAFT_PROJECT_VERSION}-${SNAPCRAFT_ARCH_TRIPLET}.tar.gz
       tar -xvf bitcoin-${SNAPCRAFT_PROJECT_VERSION}.tar.gz