diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,10 @@
 # Revision history for toml-parser
 
+## 2.0.1.2
+
+* Reject inputs with out-of-bounds time zone offsets in accordance
+  with the toml-tests test suite.
+
 ## 2.0.1.1
 
 * Fixes bug that prohibited non-ASCII characters in `'''` strings.
diff --git a/src/Toml/Syntax/Lexer.x b/src/Toml/Syntax/Lexer.x
--- a/src/Toml/Syntax/Lexer.x
+++ b/src/Toml/Syntax/Lexer.x
@@ -76,8 +76,10 @@
 @time_hour      = $digit {2}
 @time_minute    = $digit {2}
 @time_second    = $digit {2}
+@offset_hour    = [01] $digit | 2 [0-3]
+@offset_minute  = [0-5] $digit
 @time_secfrac   = "." $digit+
-@time_numoffset = [\+\-] @time_hour ":" @time_minute
+@time_numoffset = [\+\-] @offset_hour ":" @offset_minute
 @time_offset    = [Zz] | @time_numoffset
 
 @partial_time = @time_hour ":" @time_minute ":" @time_second @time_secfrac?
diff --git a/toml-parser.cabal b/toml-parser.cabal
--- a/toml-parser.cabal
+++ b/toml-parser.cabal
@@ -1,6 +1,6 @@
 cabal-version:      3.0
 name:               toml-parser
-version:            2.0.1.1
+version:            2.0.1.2
 synopsis:           TOML 1.0.0 parser
 description:
     TOML parser using generated lexers and parsers with