diff --git a/.appveyor.yml b/.appveyor.yml
index 72c4e7602..e91ddc8dc 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -8,7 +8,7 @@ environment:
   GIT_LFS_SKIP_SMUDGE: 1
 
 cache:
-  - NimBinaries
+  - NimBinaries -> .appveyor.yml
 
 matrix:
   # We always want 32-bit and 64-bit compilation
@@ -21,6 +21,10 @@ platform:
 # when multiple CI builds are queued, the tested commit needs to be in the last X commits cloned with "--depth X"
 clone_depth: 10
 
+init:
+  # disable cache saving outside the master branch
+  - ps: IF ("$env:APPVEYOR_REPO_BRANCH" -ne "master") { $env:APPVEYOR_CACHE_SKIP_SAVE = "true" }
+
 install:
   - git submodule update --init --recursive
   # use the newest versions documented here: https://www.appveyor.com/docs/windows-images-software/#mingw-msys-cygwin
diff --git a/.travis.yml b/.travis.yml
index cc3816a22..e5b5a530b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -15,9 +15,16 @@ git:
 matrix:
   include:
     - os: linux
+      arch: amd64
       sudo: required
       before_install:
         - export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:/usr/local/lib"
+    - os: linux
+      arch: arm64
+      sudo: required
+      before_install:
+        - export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:/usr/local/lib"
+        - sudo apt-get install -y libpcre3-dev
     - os: osx
       before_install:
         - launchctl setenv LIBRARY_PATH /usr/local/lib # for RocksDB