-TERMUX_PKG_VERSION=16.4.1
-TERMUX_PKG_BUILD_REVISION=1
-TERMUX_PKG_SRCURL=http://software-lab.de/picoLisp.tgz
+_PICOLISP_YEAR=17
+_PICOLISP_MONTH=1
+_PICOLISP_DAY=23
+TERMUX_PKG_VERSION=${_PICOLISP_YEAR}.${_PICOLISP_MONTH}.${_PICOLISP_DAY}
+# We use our bintray mirror since old version snapshots are not kept on main site.
+TERMUX_PKG_SRCURL=https://dl.bintray.com/termux/upstream/picolisp_${TERMUX_PKG_VERSION}.tar.gz
+TERMUX_PKG_SHA256=35f9264c9665d4247033e8d86f7fc31285621aee08009f77691e065c629c3ffd