diff --git a/src/lexer/lexer.cpp b/src/lexer/lexer.cpp
index 38fb901..e9b87bc 100644
--- a/src/lexer/lexer.cpp
+++ b/src/lexer/lexer.cpp
@@ -14,12 +14,16 @@ namespace lexer {
 
         switch (c) {
         case '=':
+            if (input.peek() == '=')
+                return {token::type::EQ, std::string{c, (char) input.get()}};
             return {token::type::ASSIGN, c};
         case '+':
             return {token::type::PLUS, c};
         case '-':
             return {token::type::MINUS, c};
         case '!':
+            if (input.peek() == '=')
+                return {token::type::NEQ, std::string{c, (char) input.get()}};
             return {token::type::BANG, c};
         case '*':
             return {token::type::ASTERISK, c};
diff --git a/src/token/type.hpp b/src/token/type.hpp
index 0f2c6b8..aeaca36 100644
--- a/src/token/type.hpp
+++ b/src/token/type.hpp
@@ -30,6 +30,8 @@ namespace token {
     X(ELSE, "ELSE")                                                            \
     X(TRUE, "TRUE")                                                            \
     X(FALSE, "FALSE")                                                          \
+    X(EQ, "==")                                                                \
+    X(NEQ, "!=")                                                               \
     X(RETURN, "RETURN")
 
     // Define the TokenType enum using the X-macro
diff --git a/test/lexer.cpp b/test/lexer.cpp
index 19137ce..696b346 100644
--- a/test/lexer.cpp
+++ b/test/lexer.cpp
@@ -56,6 +56,9 @@ if (5 < 10) {\
 } else {\
     return false;\
 }\
+\
+10 == 10;\
+10 != 9;\
 ");
 
     lexer::lexer l{ss};
@@ -137,6 +140,16 @@ if (5 < 10) {\
         {token::type::SEMICOLON, ";"},
 
         {token::type::RBRACE, "}"},
+
+        {token::type::INT, "10"},
+        {token::type::EQ, "=="},
+        {token::type::INT, "10"},
+        {token::type::SEMICOLON, ";"},
+
+        {token::type::INT, "10"},
+        {token::type::NEQ, "!="},
+        {token::type::INT, "9"},
+        {token::type::SEMICOLON, ";"},
         // clang-format on
     };