diff --git a/protocol/zcash.bib b/protocol/zcash.bib
index fc67cd0a..ab1b0a10 100644
--- a/protocol/zcash.bib
+++ b/protocol/zcash.bib
@@ -453,7 +453,7 @@ Received May~21, 2016.}
 {M}essage {A}uthentication {C}ode ({MAC})},
    howpublished={Internet Engineering Task Force (IETF)},
    date={2015-11},
-   url={https://tools.ietf.org/html/rfc7693},
+   url={https://www.rfc-editor.org/rfc/rfc7693.html},
    urldate={2016-08-31}
 }
 
@@ -464,7 +464,7 @@ Received May~21, 2016.}
 {R}equirement {L}evels},
    howpublished={Internet Engineering Task Force (IETF)},
    date={1997-03},
-   url={https://tools.ietf.org/html/rfc2119},
+   url={https://www.rfc-editor.org/rfc/rfc2119.html},
    urldate={2016-09-14}
 }
 
@@ -1043,7 +1043,7 @@ Last revised February~5, 2018.}
    title={Request for {C}omments 7539: Cha{C}ha20 and {P}oly1305 for {IETF} {P}rotocols},
    howpublished={Internet Research Task Force (IRTF)},
    date={2015-05},
-   url={https://tools.ietf.org/html/rfc7539},
+   url={https://www.rfc-editor.org/rfc/rfc7539.html},
    urldate={2016-09-02},
    addendum={As modified by verified errata at \url{https://www.rfc-editor.org/errata_search.php?rfc=7539}
 (visited on 2016-09-02).}