diff --git a/doc/chibi.scrbl b/doc/chibi.scrbl
index 837a0d31..46619d9a 100755
--- a/doc/chibi.scrbl
+++ b/doc/chibi.scrbl
@@ -1670,4 +1670,5 @@ installed. The following are currently supported:
 \item{racket - version >= 8.16 with the \scheme{r7rs} pkg}
 \item{sagittarius - version >= 0.9.13}
 \item{stklos - version > 2.10}
+\item{ypsilon - version > 2.0.8}
 ]
diff --git a/lib/chibi/snow/commands.scm b/lib/chibi/snow/commands.scm
index 0991f1ed..c7513ac8 100644
--- a/lib/chibi/snow/commands.scm
+++ b/lib/chibi/snow/commands.scm
@@ -1434,6 +1434,15 @@
      (list (make-path
             (process->string
              '(stklos -e "(display (install-path #:libdir))")))))
+     ((ypsilon)
+      (call-with-temp-file "snow-ypsilon.scm"
+       (lambda (tmp-path out preserve)
+         (with-output-to-file tmp-path
+                              (lambda ()
+                                (display "(import (core))")
+                                (newline)
+                                (display "(display (car (scheme-library-paths)))")))
+         (list (make-path (process->string `(ypsilon --r7rs ,tmp-path)))))))
     (else
      (list (make-path (or (conf-get cfg 'install-prefix) "/usr/local")
                       "share/snow"
@@ -1542,6 +1551,10 @@
          (if lib-path
              `(stklos -A ,install-dir -A ,lib-path ,file)
              `(stklos -A ,install-dir ,file)))
+        ((ypsilon)
+         (if lib-path
+             `(ypsilon --sitelib ,install-dir --sitelib ,lib-path ,file)
+             `(ypsilon --sitelib ,install-dir ,file)))
         (else
          #f))))))
 
@@ -1755,6 +1768,7 @@
    ((eq? impl 'racket) (get-install-library-dir impl cfg))
    ((eq? impl 'sagittarius) (get-install-library-dir impl cfg))
    ((eq? impl 'stklos) (get-install-library-dir impl cfg))
+   ((eq? impl 'ypsilon) (get-install-library-dir impl cfg))
    ((conf-get cfg 'install-source-dir))
    ((conf-get cfg 'install-prefix)
     => (lambda (prefix) (make-path prefix "share/snow" impl)))
@@ -1771,6 +1785,7 @@
    ((eq? impl 'racket) (get-install-library-dir impl cfg))
    ((eq? impl 'sagittarius) (get-install-library-dir impl cfg))
    ((eq? impl 'stklos) (get-install-library-dir impl cfg))
+   ((eq? impl 'ypsilon) (get-install-library-dir impl cfg))
    ((conf-get cfg 'install-data-dir))
    ((conf-get cfg 'install-prefix)
     => (lambda (prefix) (make-path prefix "share/snow" impl)))
@@ -1804,6 +1819,8 @@
     (car (get-install-dirs impl cfg)))
    ((eq? impl 'stklos)
     (car (get-install-dirs impl cfg)))
+   ((eq? impl 'ypsilon)
+    (car (get-install-dirs impl cfg)))
    ((conf-get cfg 'install-prefix)
     => (lambda (prefix) (make-path prefix "lib" impl)))
    (else snow-binary-module-directory)))
diff --git a/lib/chibi/snow/utils.scm b/lib/chibi/snow/utils.scm
index 6f07b42e..a44ea65e 100644
--- a/lib/chibi/snow/utils.scm
+++ b/lib/chibi/snow/utils.scm
@@ -67,7 +67,18 @@
     (stklos "stklos" (stklos --version) #f
                  ,(delay
                     (process->sexp
-                     '(stklos -e "(write (features))"))))))
+                     '(stklos -e "(write (features))"))))
+    (ypsilon "ypsilon" (ypsilon --version) #f
+             ,(delay
+                (call-with-temp-file "snow-ypsilon"
+                 (lambda (tmp-path out preserve)
+                  (with-output-to-file tmp-path
+                                       (lambda ()
+                                        (display "(import (scheme base) (scheme write))")
+                                        (newline)
+                                        (display "(display (features))")))
+                   (process->sexp
+                    `(ypsilon --r7rs ,tmp-path))))))))
 
 (define (impl->version impl cmd)
   (let* ((lines (process->string-list cmd))