diff --git a/ci/build.yml b/ci/build.yml
index 4ea2ee801..d93676b2f 100644
--- a/ci/build.yml
+++ b/ci/build.yml
@@ -352,7 +352,7 @@ core unix frozen debug build arm:
   <<: *gitlab_caching
   needs: []
   only:
-    - master
+    - main
     - tags
     - /^release\//
     - /^secfix\//
@@ -535,7 +535,7 @@ legacy emu regular debug build arm:
   <<: *gitlab_caching
   needs: []
   only:
-    - master
+    - main
     - tags
     - /^release\//
     - /^secfix\//
diff --git a/ci/check_changelog.sh b/ci/check_changelog.sh
index 05fc70c31..c9cab8489 100755
--- a/ci/check_changelog.sh
+++ b/ci/check_changelog.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-base_branch=master
+base_branch=main
 fail=0
 subdirs="core core/embed/boardloader core/embed/bootloader core/embed/bootloader_ci legacy/bootloader legacy/firmware legacy/intermediate_fw python"
 
diff --git a/ci/check_release_commit_messages.sh b/ci/check_release_commit_messages.sh
index 93c1bd89d..e8c852c9d 100755
--- a/ci/check_release_commit_messages.sh
+++ b/ci/check_release_commit_messages.sh
@@ -2,21 +2,21 @@
 
 fail=0
 
-git fetch origin master
+git fetch origin main
 
-# list all commits between HEAD and master
-for commit in $(git rev-list origin/master..)
+# list all commits between HEAD and main
+for commit in $(git rev-list origin/main..)
 do
     message=$(git log -n1 --format=%B $commit)
     echo "Checking $commit"
 
     # The commit message must contain either
-    # 1. "cherry-picked from [some commit in master]"
+    # 1. "cherry-picked from [some commit in main]"
     if [[ $message =~ "(cherry picked from commit" ]]; then
       # remove last ")" and extract commit hash
-      master_commit=$(echo ${message:0:-1} | tr ' ' '\n' | tail -1)
-      # check if master really contains this commit hash
-      if [[ $(git branch -a --contains $master_commit | grep --only-matching "remotes/origin/master") == "remotes/origin/master" ]]; then
+      main_commit=$(echo ${message:0:-1} | tr ' ' '\n' | tail -1)
+      # check if main really contains this commit hash
+      if [[ $(git branch -a --contains $main_commit | grep --only-matching "remotes/origin/main") == "remotes/origin/main" ]]; then
         continue
       fi
     fi
diff --git a/ci/posttest.yml b/ci/posttest.yml
index ad25a8bf1..f2c64adc7 100644
--- a/ci/posttest.yml
+++ b/ci/posttest.yml
@@ -33,7 +33,7 @@ core unix coverage posttest:
 unix ui changes:
   stage: posttest
   except:
-    - master
+    - main
   <<: *gitlab_caching
   needs:
     - core click test
diff --git a/ci/prebuild.yml b/ci/prebuild.yml
index 7c4057c91..5e8b7553a 100644
--- a/ci/prebuild.yml
+++ b/ci/prebuild.yml
@@ -47,7 +47,7 @@ release commit messages prebuild:
   stage: prebuild
   before_script: []  # nothing needed
   variables:
-    # We need to clone the repo properly so we can work with origin/master.
+    # We need to clone the repo properly so we can work with origin/main.
     GIT_STRATEGY: clone
   only:
     refs:
@@ -63,7 +63,7 @@ release commit messages prebuild:
 changelog prebuild:
   stage: prebuild
   except:
-    - master
+    - main
   before_script: []  # nothing needed
   variables:
     GIT_SUBMODULE_STRATEGY: "none"
diff --git a/create_monorepo.py b/create_monorepo.py
index 00ecf2d85..2493ec6d4 100644
--- a/create_monorepo.py
+++ b/create_monorepo.py
@@ -26,7 +26,7 @@ GITSUBREPO_TEMPLATE = """\
 ;
 [subrepo]
 	remote = git+ssh://git@github.com/trezor/{remote}
-	branch = master
+	branch = main
 	commit = {remote_head}
 	parent = {current_head}
 	method = rebase
@@ -45,22 +45,22 @@ def git(args):
 
 def move_to_subtree(remote, dst):
     os.makedirs(dst, exist_ok=True)
-    for fn in lines(git(f"ls-tree --name-only remotes/{remote}/master")):
+    for fn in lines(git(f"ls-tree --name-only remotes/{remote}/main")):
         if fn == ".gitmodules":
             continue
         git(f"mv {fn} {dst}/{fn}")
 
 
 def rewrite_gitmodules(remote, dst):
-    master_gitmodules = git("show master:.gitmodules")
+    main_gitmodules = git("show main:.gitmodules")
     try:
-        gitmodules = git(f"show {remote}/master:.gitmodules")
+        gitmodules = git(f"show {remote}/main:.gitmodules")
     except:
         # no gitmodules
         return
     gitmodules = gitmodules.replace('submodule "', f'submodule "{dst}/')
     with open(".gitmodules", "w") as f:
-        f.write(master_gitmodules + gitmodules)
+        f.write(main_gitmodules + gitmodules)
     git("add .gitmodules")
 
 
@@ -68,7 +68,7 @@ def merge_remote(remote, dst):
     git(f"remote add {remote} {TREZOR_REPO}/{remote}")
     git(f"fetch {remote}")
     try:
-        git(f"merge --no-commit --allow-unrelated-histories {remote}/master")
+        git(f"merge --no-commit --allow-unrelated-histories {remote}/main")
     except:
         # this might fail because of .gitmodules conflict
         pass
@@ -86,8 +86,8 @@ def retag_remote(remote, dst):
 
 
 def generate_subrepo_file(remote):
-    current_head = git("rev-parse master").strip()
-    remote_head = git(f"rev-parse {remote}/master").strip()
+    current_head = git("rev-parse main").strip()
+    remote_head = git(f"rev-parse {remote}/main").strip()
     dst = SUBREPOS[remote]
     with open(f"{dst}/.gitrepo", "w") as f:
         f.write(GITSUBREPO_TEMPLATE.format(remote=remote, current_head=current_head, remote_head=remote_head))
@@ -106,7 +106,7 @@ def main():
 
         if remote in PUBLISHED_SUBREPOS:
             with open(f"{dst}/.gitmodules", "w") as f:
-                f.write(git(f"show {remote}/master:.gitmodules"))
+                f.write(git(f"show {remote}/main:.gitmodules"))
             git(f"add {dst}/.gitmodules")
 
         git(f"commit -m 'MONOREPO MERGE {remote}'")
diff --git a/docs/misc/contributing.md b/docs/misc/contributing.md
index afdc6f9f6..69b0eee69 100644
--- a/docs/misc/contributing.md
+++ b/docs/misc/contributing.md
@@ -47,8 +47,8 @@ means that **our team will not be accepting any requests to add new
 cryptocurrencies.**
 
   [trezor-firmware]: https://github.com/trezor/trezor-firmware
-  [common/defs/bitcoin]: https://github.com/trezor/trezor-firmware/tree/master/common/defs/bitcoin
+  [common/defs/bitcoin]: https://github.com/trezor/trezor-firmware/tree/main/common/defs/bitcoin
   [ethereum-lists/chains]: https://github.com/ethereum-lists/chains
   [ethereum-lists/tokens]: https://github.com/ethereum-lists/tokens
-  [common/defs/nem/nem_mosaics.json]: https://github.com/trezor/trezor-firmware/tree/master/common/defs/nem/nem_mosaics.json
-  [common/defs/misc/misc.json]: https://github.com/trezor/trezor-firmware/tree/master/common/defs/misc/misc.json
+  [common/defs/nem/nem_mosaics.json]: https://github.com/trezor/trezor-firmware/tree/main/common/defs/nem/nem_mosaics.json
+  [common/defs/misc/misc.json]: https://github.com/trezor/trezor-firmware/tree/main/common/defs/misc/misc.json