diff --git a/README.md b/README.md
index 63c8938..149c15d 100644
--- a/README.md
+++ b/README.md
@@ -37,11 +37,11 @@
 
    ```bash
    $ cd ~
-   $ wget https://github.com/pagespeed/ngx_pagespeed/archive/v1.8.31.3-beta.zip
-   $ unzip v1.8.31.3-beta.zip # or unzip v1.8.31.3-beta
-   $ cd ngx_pagespeed-1.8.31.3-beta/
-   $ wget https://dl.google.com/dl/page-speed/psol/1.8.31.3.tar.gz
-   $ tar -xzvf 1.8.31.3.tar.gz # expands to psol/
+   $ wget https://github.com/pagespeed/ngx_pagespeed/archive/v1.8.31.4-beta.zip
+   $ unzip v1.8.31.4-beta.zip # or unzip v1.8.31.4-beta
+   $ cd ngx_pagespeed-1.8.31.4-beta/
+   $ wget https://dl.google.com/dl/page-speed/psol/1.8.31.4.tar.gz
+   $ tar -xzvf 1.8.31.4.tar.gz # expands to psol/
    ```
 
 3. Download and build nginx:
@@ -52,7 +52,7 @@
    $ wget http://nginx.org/download/nginx-1.6.0.tar.gz
    $ tar -xvzf nginx-1.6.0.tar.gz
    $ cd nginx-1.6.0/
-   $ ./configure --add-module=$HOME/ngx_pagespeed-1.8.31.3-beta
+   $ ./configure --add-module=$HOME/ngx_pagespeed-1.8.31.4-beta
    $ make
    $ sudo make install
    ```
@@ -91,7 +91,7 @@
 
 ```bash
 $ curl -I 'http://localhost:8050/some_page/' | grep X-Page-Speed
-X-Page-Speed: 1.8.31.3-...
+X-Page-Speed: 1.8.31.4-...
 ```
 
 Looking at the source of a few pages you should see various changes, such as
diff --git a/config b/config
index c5f454e..ad6cc41 100644
--- a/config
+++ b/config
@@ -27,8 +27,8 @@
     echo "   You need to separately download the pagespeed library:"
     echo ""
     echo "     $ cd /path/to/ngx_pagespeed"
-    echo "     $ wget https://dl.google.com/dl/page-speed/psol/1.8.31.3.tar.gz"
-    echo "     $ tar -xzvf 1.8.31.3.tar.gz # expands to psol/"
+    echo "     $ wget https://dl.google.com/dl/page-speed/psol/1.8.31.4.tar.gz"
+    echo "     $ tar -xzvf 1.8.31.4.tar.gz # expands to psol/"
     echo ""
     echo "   Or see the installation instructions:"
     echo "     https://github.com/pagespeed/ngx_pagespeed#how-to-build"