diff --git a/extra/nss/checksums b/extra/nss/checksums
index 06d1aba1..4de40ff3 100644
--- a/extra/nss/checksums
+++ b/extra/nss/checksums
@@ -1,4 +1,4 @@
-9ec84fb44730fb05dea1a985408f8e432bd89276e0af2c22356868a2d555d56cdc
+2a9e9640da064a95b9fcf3f4cb4af91785ad77692de4f8b363295ee1a0b3e470fd
 1da24f15b6e64671614658955882a4eadbf07aea4148cdf7b43c983f7c3c72a895
 9fd949c5b83c675bc0ba0ac87a5d266e3bd350008494d15adf402a6041d9dd1ae1
 c3b17eed7fb3298ff5f4083478a1bdad6b220bdcbe93b0edf63d50b3b61fffe233
diff --git a/extra/nss/sources b/extra/nss/sources
index 7ad2bbec..d9c77b7f 100644
--- a/extra/nss/sources
+++ b/extra/nss/sources
@@ -1,4 +1,4 @@
-https://ftp.mozilla.org/pub/security/nss/releases/NSS_3_90_RTM/src/nss-3.90.tar.gz
+https://ftp.mozilla.org/pub/security/nss/releases/NSS_3_91_RTM/src/nss-3.91.tar.gz
 files/certdata.sh nss/lib/ckfw/builtins
 files/generated.hash
 patches/no-perl.patch
diff --git a/extra/nss/version b/extra/nss/version
index 975e9352..c8f946b3 100644
--- a/extra/nss/version
+++ b/extra/nss/version
@@ -1 +1 @@
-3.90 1
+3.91 1