diff --git a/gub/specs/imagemagick.py b/gub/specs/imagemagick.py
index ed11af4..27b9d45 100644
--- a/gub/specs/imagemagick.py
+++ b/gub/specs/imagemagick.py
@@ -4,7 +4,7 @@ from gub import misc
 from gub import tools
 
 class ImageMagick__tools (tools.AutoBuild):
-    source = 'http://ftp.surfnet.nl/pub/ImageMagick/ImageMagick-6.5.7-8.tar.gz'
+    source = 'http://ftp.nluug.nl/ImageMagick/ImageMagick-6.8.7-5.tar.bz2'
     dependencies = [
             'automake',
             'bzip2',
diff --git a/gub/specs/librubberband.py b/gub/specs/librubberband.py
index 42758c5..c14029b 100644
--- a/gub/specs/librubberband.py
+++ b/gub/specs/librubberband.py
@@ -1,7 +1,7 @@
 from gub import target
 
 class Librubberband (target.AutoBuild):
-    source = 'http://code.breakfastquay.com/attachments/download/34/rubberband-1.8.1.tar.gz'
+    source = 'http://denemo.org/downloads/gub/rubberband-1.8.1.tar.gz'
     dependencies = ['vamp-plugin-sdk', 'libsamplerate', 'libsndfile', 'libfftw']
 #    configure_variables = (target.AutoBuild.configure_variables
 # 			   + ' Vamp_CFLAGS="-I%(system_prefix)s/../vamp-sdk/" '
diff --git a/gub/specs/libsndfile.py b/gub/specs/libsndfile.py
index 1cb2be5..8d18fec 100644
--- a/gub/specs/libsndfile.py
+++ b/gub/specs/libsndfile.py
@@ -1,7 +1,7 @@
 from gub import target
 
 class Libsndfile (target.AutoBuild):
-    source = 'http://www.mega-nerd.com/libsndfile/files/libsndfile-1.0.21.tar.gz'
+    source = 'http://www.mega-nerd.com/libsndfile/files/libsndfile-1.0.25.tar.gz'
     dependencies = [
         'tools::automake',
         'tools::pkg-config',
diff --git a/gub/specs/vamp-plugin-sdk.py b/gub/specs/vamp-plugin-sdk.py
index 8c38e9e..debd382 100644
--- a/gub/specs/vamp-plugin-sdk.py
+++ b/gub/specs/vamp-plugin-sdk.py
@@ -2,6 +2,6 @@ from gub import target
 from gub import build
 
 class Vamp_plugin_sdk (target.AutoBuild):
-    source = 'http://code.soundsoftware.ac.uk/attachments/download/690/vamp-plugin-sdk-2.5.tar.gz'
+    source = 'http://denemo.org/downloads/gub/vamp-plugin-sdk-2.5.tar.gz'
     dependencies = ['libsndfile']