diff --git a/CHANGELOG.md b/CHANGELOG.md
index f37d8f8..b4dcce2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ## Unreleased
 
+* Fix 102/105-key German layout: Add missing Alt-Gr combinations
+
 ## v0.8.0 (13 Sep 2024)
 
 * Add 102/105-key Finnish/Swedish layout
diff --git a/src/layouts/de105.rs b/src/layouts/de105.rs
index 72c958e..364dc4b 100644
--- a/src/layouts/de105.rs
+++ b/src/layouts/de105.rs
@@ -34,14 +34,18 @@ impl KeyboardLayout for De105Key {
                 }
             }
             KeyCode::Key2 => {
-                if modifiers.is_shifted() {
+                if modifiers.is_altgr() {
+                    DecodedKey::Unicode('²')
+                } else if modifiers.is_shifted() {
                     DecodedKey::Unicode('"')
                 } else {
                     DecodedKey::Unicode('2')
                 }
             }
             KeyCode::Key3 => {
-                if modifiers.is_shifted() {
+                if modifiers.is_altgr() {
+                    DecodedKey::Unicode('³')
+                } else if modifiers.is_shifted() {
                     DecodedKey::Unicode('§')
                 } else {
                     DecodedKey::Unicode('3')
@@ -69,35 +73,45 @@ impl KeyboardLayout for De105Key {
                 }
             }
             KeyCode::Key7 => {
-                if modifiers.is_shifted() {
+                if modifiers.is_altgr() {
+                    DecodedKey::Unicode('{')
+                } else if modifiers.is_shifted() {
                     DecodedKey::Unicode('/')
                 } else {
                     DecodedKey::Unicode('7')
                 }
             }
             KeyCode::Key8 => {
-                if modifiers.is_shifted() {
+                if modifiers.is_altgr() {
+                    DecodedKey::Unicode('[')
+                } else if modifiers.is_shifted() {
                     DecodedKey::Unicode('(')
                 } else {
                     DecodedKey::Unicode('8')
                 }
             }
             KeyCode::Key9 => {
-                if modifiers.is_shifted() {
+                if modifiers.is_altgr() {
+                    DecodedKey::Unicode(']')
+                } else if modifiers.is_shifted() {
                     DecodedKey::Unicode(')')
                 } else {
                     DecodedKey::Unicode('9')
                 }
             }
             KeyCode::Key0 => {
-                if modifiers.is_shifted() {
+                if modifiers.is_altgr() {
+                    DecodedKey::Unicode('}')
+                } else if modifiers.is_shifted() {
                     DecodedKey::Unicode('=')
                 } else {
                     DecodedKey::Unicode('0')
                 }
             }
             KeyCode::OemMinus => {
-                if modifiers.is_shifted() {
+                if modifiers.is_altgr() {
+                    DecodedKey::Unicode('\\')
+                } else if modifiers.is_shifted() {
                     DecodedKey::Unicode('?')
                 } else {
                     DecodedKey::Unicode('ß')
@@ -190,6 +204,17 @@ impl KeyboardLayout for De105Key {
                     DecodedKey::Unicode('y')
                 }
             }
+            KeyCode::M => {
+                if map_to_unicode && modifiers.is_ctrl() {
+                    DecodedKey::Unicode('\u{001A}')
+                } else if modifiers.is_altgr() {
+                    DecodedKey::Unicode('µ')
+                } else if modifiers.is_caps() {
+                    DecodedKey::Unicode('M')
+                } else {
+                    DecodedKey::Unicode('m')
+                }
+            }
             KeyCode::OemComma => {
                 if modifiers.is_shifted() {
                     DecodedKey::Unicode(';')