diff --git a/samples/ruby.rb b/samples/ruby.rb
index bbeefe8..ba42f46 100644
--- a/samples/ruby.rb
+++ b/samples/ruby.rb
@@ -43,7 +43,7 @@ UNINITCORE = %{
 
 # Unicode identifiers (valid in Ruby)
 变量 = 0x5_4eddaee
-π = 3.14_159e+2, ?\u0234, ?\,, ?\x0A, ?s
+π = 3.14_159e+2, ?\u0234, ?\,, ?\x0A, ?s, trued, falsess
 挨拶 = -> { "こんに \n ちは" }
 
 # Method using unicode variable names
diff --git a/src/syntax/bash.cc b/src/syntax/bash.cc
index e7ce9e3..c36f504 100644
--- a/src/syntax/bash.cc
+++ b/src/syntax/bash.cc
@@ -65,7 +65,6 @@ std::shared_ptr<void> bash_parse(std::vector<Token> *tokens,
     len--;
   if (len == 0)
     return state;
-  bool heredoc_first = false;
   while (i < len) {
     i += utf8_codepoint_width(text[i]);
   }
diff --git a/src/syntax/ruby.cc b/src/syntax/ruby.cc
index a67672e..ca7359c 100644
--- a/src/syntax/ruby.cc
+++ b/src/syntax/ruby.cc
@@ -800,14 +800,16 @@ std::shared_ptr<void> ruby_parse(std::vector<Token> *tokens,
         continue;
       } else {
         uint32_t start = i;
-        if (i + 4 < len && text[i] == 't' && text[i + 1] == 'r' &&
-            text[i + 2] == 'u' && text[i + 3] == 'e') {
+        if (i + 3 < len && text[i] == 't' && text[i + 1] == 'r' &&
+            text[i + 2] == 'u' && text[i + 3] == 'e' && i + 4 < len &&
+            !identifier_char(text[i + 4])) {
           i += 4;
           tokens->push_back({start, i, TokenKind::True});
           continue;
         }
-        if (i + 5 < len && text[i] == 'f' && text[i + 1] == 'a' &&
-            text[i + 2] == 'l' && text[i + 3] == 's' && text[i + 4] == 'e') {
+        if (i + 4 < len && text[i] == 'f' && text[i + 1] == 'a' &&
+            text[i + 2] == 'l' && text[i + 3] == 's' && text[i + 4] == 'e' &&
+            i + 5 < len && !identifier_char(text[i + 5])) {
           i += 5;
           tokens->push_back({start, i, TokenKind::False});
           continue;
diff --git a/themes/default.json b/themes/default.json
index 36e6b83..09a49c2 100644
--- a/themes/default.json
+++ b/themes/default.json
@@ -22,10 +22,10 @@
     "fg": "#E6C08A"
   },
   "True": {
-    "fg": "#0FFF0F"
+    "fg": "#7AE93C"
   },
   "False": {
-    "fg": "#FF0F0F"
+    "fg": "#F03138"
   },
   "Char": {
     "fg": "#FFAF70"