diff --git a/_ext/eclipse-cdt/CHANGES.md b/_ext/eclipse-cdt/CHANGES.md
index 042b793032..2f7d5f6cb3 100644
--- a/_ext/eclipse-cdt/CHANGES.md
+++ b/_ext/eclipse-cdt/CHANGES.md
@@ -4,6 +4,10 @@ We adhere to the [keepachangelog](https://keepachangelog.com/en/1.0.0/) format (
 
 ## [Unreleased]
 
+## [10.5.0] - 2021-12-10
+### Added
+* Switch to Eclipse CDT release 10.5 for Eclipse 2021-12.
+
 ## [10.4.0] - 2021-09-23
 ### Added
 * Switch to Eclipse CDT release 10.4 for Eclipse 4.21.
diff --git a/_ext/eclipse-cdt/gradle.properties b/_ext/eclipse-cdt/gradle.properties
index 0e08f5f820..9c1c8a7ee6 100644
--- a/_ext/eclipse-cdt/gradle.properties
+++ b/_ext/eclipse-cdt/gradle.properties
@@ -5,7 +5,7 @@ description=Eclipse's CDT C/C++ formatter bundled for Spotless
 VER_JAVA=11
 
 # Compile dependencies
-VER_ECLIPSE_CDT=10.4
+VER_ECLIPSE_CDT=10.5
 VER_SPOTLESS_ECLISPE_BASE=[3.5.0,4.0.0[
 VER_ECLISPE_JFACE=[3.18.0,4.0.0[
 VER_ECLISPE_EFS=[3.7.0,4.0.0[