diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 71aa646..173ed48 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -13,7 +13,7 @@ jobs:
   check-firmware:
     runs-on: ubuntu-latest
     container:
-      image: ghcr.io/tillitis/tkey-builder:4
+      image: ghcr.io/tillitis/tkey-builder:5rc1
     steps:
       - name: checkout
         uses: actions/checkout@v4
@@ -44,7 +44,7 @@ jobs:
   check-verilog:
     runs-on: ubuntu-latest
     container:
-      image: ghcr.io/tillitis/tkey-builder:4
+      image: ghcr.io/tillitis/tkey-builder:5rc1
     steps:
       - name: checkout
         uses: actions/checkout@v4
@@ -64,7 +64,7 @@ jobs:
   build-usb-firmware:
     runs-on: ubuntu-latest
     container:
-      image: ghcr.io/tillitis/tkey-builder:4
+      image: ghcr.io/tillitis/tkey-builder:5rc1
     steps:
       - name: checkout
         uses: actions/checkout@v4
@@ -86,7 +86,7 @@ jobs:
       commit_sha: ${{ github.sha }}
     runs-on: ubuntu-latest
     container:
-      image: ghcr.io/tillitis/tkey-builder:4
+      image: ghcr.io/tillitis/tkey-builder:5rc1
     steps:
       - name: checkout
         uses: actions/checkout@v4
@@ -115,7 +115,7 @@ jobs:
     needs: build-bitstream
     runs-on: ubuntu-latest
     container:
-      image: ghcr.io/tillitis/tkey-builder:4
+      image: ghcr.io/tillitis/tkey-builder:5rc1
     steps:
       - name: Checkout
         uses: actions/checkout@v4
diff --git a/contrib/Makefile b/contrib/Makefile
index ec8a0ca..e37cd4e 100644
--- a/contrib/Makefile
+++ b/contrib/Makefile
@@ -5,7 +5,7 @@
 BUILDIMAGE=tkey-builder-local
 
 # default image used when running a container
-IMAGE=ghcr.io/tillitis/tkey-builder:4
+IMAGE=ghcr.io/tillitis/tkey-builder:5rc1
 
 all:
 	@echo "Targets:"