diff --git a/0ad.spec b/0ad.spec
index af36b88..c407d38 100644
--- a/0ad.spec
+++ b/0ad.spec
@@ -81,7 +81,7 @@ BuildRequires:	libvorbis-devel
 BuildRequires:	libxml2-devel
 BuildRequires:	libzip-devel
 BuildRequires:	miniupnpc-devel
-BuildRequires:	mozjs31-devel
+BuildRequires:	mozjs38-devel
 %if %{with system_nvtt}
 BuildRequires:	nvidia-texture-tools-devel
 %endif
@@ -143,7 +143,7 @@ build/workspaces/update-workspaces.sh	\
     --bindir %{_bindir}			\
     --datadir %{_datadir}/%{name}	\
     --libdir %{_libdir}/%{name}		\
-    --with-system-mozjs31		\
+    --with-system-mozjs38		\
 %if %{with system_nvtt}
     --with-system-nvtt			\
 %endif