diff --git a/jenkins.sh b/jenkins.sh
index 3a4ee0c7..2bccf0f8 100755
--- a/jenkins.sh
+++ b/jenkins.sh
@@ -13,6 +13,12 @@ npm install
 # apparently npm 3.10.3 on node 6.4.0 doesn't upgrade #develop target with npm install unless explicitly asked.
 npm install matrix-react-sdk matrix-js-sdk
 
+# install olm. A naive 'npm i ./olm/olm-*.tgz' fails because it uses the url
+# from our package.json (or even matrix-js-sdk's) in preference.
+tar -C olm -xz < olm/olm-*.tgz
+rm -r node_modules/olm
+cp -r olm/package node_modules/olm
+
 # we may be using a dev branch of react-sdk, in which case we need to build it
 (cd node_modules/matrix-react-sdk && npm run build)
 
diff --git a/package.json b/package.json
index cc87daf5..c52e26d0 100644
--- a/package.json
+++ b/package.json
@@ -90,6 +90,6 @@
     "webpack": "^1.12.14"
   },
   "optionalDependencies": {
-    "olm": "https://matrix.org/packages/npm/olm/olm-1.1.0.tgz"
+    "olm": "https://matrix.org/packages/npm/olm/olm-1.2.0.tgz"
   }
 }