diff --git a/src/digraph.c b/src/digraph.c
index fb45c15..0a4a4a3 100644
--- a/src/digraph.c
+++ b/src/digraph.c
@@ -853,6 +853,7 @@
 	{'1', '\'', 0x2032},
 	{'2', '\'', 0x2033},
 	{'3', '\'', 0x2034},
+	{'4', '\'', 0x2057},
 	{'1', '"', 0x2035},
 	{'2', '"', 0x2036},
 	{'3', '"', 0x2037},
diff --git a/src/testdir/test_digraph.vim b/src/testdir/test_digraph.vim
index a8a55a7..4aed403 100644
--- a/src/testdir/test_digraph.vim
+++ b/src/testdir/test_digraph.vim
@@ -37,6 +37,9 @@
   call Put_Dig("=P")
   call Put_Dig("P=")
   call assert_equal(['Р']+repeat(["₽"],2)+['П'], getline(line('.')-3,line('.')))
+  " Quadruple prime
+  call Put_Dig("'4")
+  call assert_equal("⁗", getline('.'))
   " Not a digraph
   call Put_Dig("a\<bs>")
   call Put_Dig("\<bs>a")
diff --git a/src/version.c b/src/version.c
index 4bdf570..7584e45 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2056,
+/**/
     2055,
 /**/
     2054,