diff --git a/README.md b/README.md
index 39076e5..90bbc73 100644
--- a/README.md
+++ b/README.md
@@ -22,10 +22,12 @@ Base | Alphabet
 2 | `01`
 8 | `01234567`
 11 | `0123456789a`
-32 | `0123456789ABCDEFGHJKMNPQRSTVWXYZ`
+26 | `ABCDEFGHIJKLMNOPQRSTUVWXYZ`
+26 | `abcdefghijklmnopqrstuvwxyz` (lowercase)
 32 | `ybndrfg8ejkmcpqxot1uwisza345h769` (z-base-32)
 36 | `0123456789abcdefghijklmnopqrstuvwxyz`
 45 | `0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ $%*+-./:`
+52 | `ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz`
 58 | `123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz` (bitcoin)
 58 | `123456789abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ` (flickr)
 58 | `rpshnaf39wBUDNEGHJKLM4PQRST7VWXYZ2bcdeCg65jkm8oFqi1tuvAxyz` (ripple)
diff --git a/src/base_x/alphabets.cr b/src/base_x/alphabets.cr
index fa76219..5bb8f4f 100644
--- a/src/base_x/alphabets.cr
+++ b/src/base_x/alphabets.cr
@@ -11,6 +11,10 @@ end
   base11: {
     default: "0123456789a",
   },
+  base26: {
+    default:   "ABCDEFGHJKMNPQRSTVWXYZ",
+    lowercase: "abcdefghijklmnopqrstuvwxyz",
+  },
   base32: {
     default: "0123456789ABCDEFGHJKMNPQRSTVWXYZ",
     z_base:  "ybndrfg8ejkmcpqxot1uwisza345h769",
@@ -21,6 +25,9 @@ end
   base45: {
     default: "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ $%*+-./:",
   },
+  base52: {
+    default: "ABCDEFGHJKMNPQRSTVWXYZabcdefghijklmnopqrstuvwxyz",
+  },
   base58: {
     default: "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz",
     flickr:  "123456789abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ",