diff --git a/build_archdep b/build_archdep
index ff978b7..72c4bc8 100755
--- a/build_archdep
+++ b/build_archdep
@@ -15,6 +15,7 @@ main() (
 
 	grep -P '^(linux-)?(any|'"$dpkg_arch"')$' <<< "$dsc_arch" || exit 0
 
+	sudo apt-get update
 	sudo apt-get build-dep --no-install-recommends -y "$dsc"
 
 	dpkg-source --extract "$dsc" src
diff --git a/build_indep b/build_indep
index db97369..0362135 100755
--- a/build_indep
+++ b/build_indep
@@ -14,6 +14,7 @@ main() (
 
 	grep -P '^(linux-)?all$' <<< "$dsc_arch" || exit 0
 
+	sudo apt-get update
 	sudo apt-get build-dep --no-install-recommends -y "$dsc"
 
 	dpkg-source --extract "$dsc" src