diff --git a/.semaphore/semaphore.yml b/.semaphore/semaphore.yml
new file mode 100644
index 00000000..1a419bd6
--- /dev/null
+++ b/.semaphore/semaphore.yml
@@ -0,0 +1,28 @@
+---
+# vi: sw=2 ts=2 et:
+
+version: v1.0
+name: casync
+agent:
+  machine:
+    type: e1-standard-2
+    os_image: ubuntu1804
+
+# Auto-cancel all running & queued jobs on force-push
+auto_cancel:
+  running:
+    when: "true"
+
+# Cancel all jobs on the first fail
+fail_fast:
+  cancel:
+    when: "true"
+
+blocks:
+  - name: amd64 & i386
+    task:
+      jobs:
+        - name: Build & run
+          commands:
+            - checkout
+            - test/semaphore-run
diff --git a/test/semaphore-run b/test/semaphore-run
index 51c971db..a1f31f4e 100755
--- a/test/semaphore-run
+++ b/test/semaphore-run
@@ -19,11 +19,7 @@ set -eu
 (
     set -x
 
-    sudo rm /etc/apt/sources.list.d/*
-
-    sudo apt install -y software-properties-common
-    sudo add-apt-repository -y ppa:jonathonf/python-3.6
-    sudo add-apt-repository -y ppa:ginggs/backports
+    sudo apt install -y gcc-7 libgcc-7-dev software-properties-common
     sudo apt -y update
     sudo apt -y --no-install-recommends install \
          python3.6 \
@@ -39,7 +35,7 @@ set -eu
          python3-wheel \
          python-sphinx \
          "${DEVPKGS[@]}"
-    python3.6 -m pip install --user meson ninja
+    sudo python3.6 -m pip install meson ninja
 )
 
 echo
@@ -75,7 +71,7 @@ echo "============= Installing i386 build dependencies =============="
     sudo apt remove -y libcurl4-openssl-dev
     sudo apt-get install -y --no-install-recommends \
          gcc-multilib \
-         libgcc-5-dev:i386 \
+         libgcc-7-dev:i386 \
          "${DEVPKGS[@]/%/:i386}"
 )
 
@@ -84,7 +80,7 @@ echo "============= Building i386 =============="
 (
     set -x
     export PKG_CONFIG_PATH=/usr/lib/i386-linux-gnu
-    CC=gcc-5 CFLAGS=-m32 LDFLAGS=-m32 meson build-i386
+    CC=gcc-7 CFLAGS=-m32 LDFLAGS=-m32 meson build-i386
     ninja -C build-i386
 )