diff --git a/scripts/custom-docker-build b/scripts/custom-docker-build
index 12245d7..4e146cf 100755
--- a/scripts/custom-docker-build
+++ b/scripts/custom-docker-build
@@ -73,38 +73,6 @@ function print_chrome_args() {
 # see https://www.kernel.org/pub/software/scm/git
 function print_git_args() {
     case "$1" in
-        2.18)
-            GIT_VERSION=2.18.0
-            GIT_DOWNLOAD_SHA256=94faf2c0b02a7920b0b46f4961d8e9cad08e81418614102898a55f980fa3e7e4
-            ;;
-        2.21)
-            GIT_VERSION=2.21.0
-            GIT_DOWNLOAD_SHA256=85eca51c7404da75e353eba587f87fea9481ba41e162206a6f70ad8118147bee
-            ;;
-        2.22)
-            GIT_VERSION=2.22.0
-            GIT_DOWNLOAD_SHA256=a4b7e4365bee43caa12a38d646d2c93743d755d1cea5eab448ffb40906c9da0b
-            ;;
-        2.24)
-            GIT_VERSION=2.24.3
-            GIT_DOWNLOAD_SHA256=ef6d1d1de1d7921a54d23d07479bd2766f050d6435cea5d3b5322aa4897cb3d7
-            ;;
-        2.25)
-            GIT_VERSION=2.25.4
-            GIT_DOWNLOAD_SHA256=1b11d0ee481c6735e9f7d81a3576ef0989bde7843cb4adcdef578c0593d279ab
-            ;;
-        2.26)
-            GIT_VERSION=2.26.2
-            GIT_DOWNLOAD_SHA256=e1c17777528f55696815ef33587b1d20f5eec246669f3b839d15dbfffad9c121
-            ;;
-        2.27)
-            GIT_VERSION=2.27.0
-            GIT_DOWNLOAD_SHA256=77ded85cbe42b1ffdc2578b460a1ef5d23bcbc6683eabcafbb0d394dffe2e787
-            ;;
-        2.28)
-            GIT_VERSION=2.28.0
-            GIT_DOWNLOAD_SHA256=f914c60a874d466c1e18467c864a910dd4ea22281ba6d4d58077cb0c3f115170
-            ;;
         2.29)
             GIT_VERSION=2.29.0
             GIT_DOWNLOAD_SHA256=fa08dc8424ef80c0f9bf307877f9e2e49f1a6049e873530d6747c2be770742ff