diff --git a/lib/travis/build/appliances/nonblock_pipe.rb b/lib/travis/build/appliances/nonblock_pipe.rb
index df9b69c520..c755f5e315 100644
--- a/lib/travis/build/appliances/nonblock_pipe.rb
+++ b/lib/travis/build/appliances/nonblock_pipe.rb
@@ -19,7 +19,7 @@ def apply
 flags_stderr = fcntl.fcntl(sys.stderr, fcntl.F_GETFL)
 fcntl.fcntl(sys.stderr, fcntl.F_SETFL, flags_stderr&~os.O_NONBLOCK)
 EOPY
-  python ~/nonblock.py
+  python3 ~/nonblock.py
   rm ~/nonblock.py
 fi
 EOF
diff --git a/lib/travis/build/script/python.rb b/lib/travis/build/script/python.rb
index eb2eebd7cf..8e9db2bbea 100644
--- a/lib/travis/build/script/python.rb
+++ b/lib/travis/build/script/python.rb
@@ -48,8 +48,8 @@ def setup
         end
 
         def announce
-          sh.cmd 'python --version'
-          sh.cmd 'pip --version'
+          sh.cmd 'python3 --version'
+          sh.cmd 'pip3 --version'
           sh.export 'PIP_DISABLE_PIP_VERSION_CHECK', '1', echo: false
           sh.export 'PIP_PROGRESS_BAR', 'off', echo: false
         end
@@ -66,10 +66,10 @@ def setup_cache
         def install
           warn_pip_20_3
           sh.if '-f Requirements.txt' do
-            sh.cmd 'pip install -r Requirements.txt', fold: 'install', retry: true
+            sh.cmd 'pip3 install -r Requirements.txt', fold: 'install', retry: true
           end
           sh.elif '-f requirements.txt' do
-            sh.cmd 'pip install -r requirements.txt', fold: 'install', retry: true
+            sh.cmd 'pip3 install -r requirements.txt', fold: 'install', retry: true
           end
           sh.else do
             sh.echo REQUIREMENTS_MISSING # , ansi: :red
@@ -149,10 +149,10 @@ def setup_path(version = 'nightly')
           end
 
           def pip_version_at_least_20_2?
-            "$(travis_vers2int $(pip --version | cut -f2 -d \" \")) -ge $(travis_vers2int \"20.2\")"
+            "$(travis_vers2int $(pip3 --version | cut -f2 -d \" \")) -ge $(travis_vers2int \"20.2\")"
           end
           def pip_version_before_20_3?
-            "$(travis_vers2int $(pip --version | cut -f2 -d \" \")) -lt $(travis_vers2int \"20.3\")"
+            "$(travis_vers2int $(pip3 --version | cut -f2 -d \" \")) -lt $(travis_vers2int \"20.3\")"
           end
 
           def warn_pip_20_3
diff --git a/spec/build/script/python_spec.rb b/spec/build/script/python_spec.rb
index 45321c5efc..a50b9d9a5b 100644
--- a/spec/build/script/python_spec.rb
+++ b/spec/build/script/python_spec.rb
@@ -15,7 +15,7 @@
 
   it_behaves_like 'compiled script' do
     let(:code) { ['TRAVIS_LANGUAGE=python'] }
-    let(:cmds) { ['pip install'] }
+    let(:cmds) { ['pip3 install'] }
   end
 
   describe 'given a script' do
@@ -146,11 +146,11 @@
   end
 
   it 'announces python --version' do
-    should include_sexp [:cmd,  'python --version', echo: true]
+    should include_sexp [:cmd,  'python3 --version', echo: true]
   end
 
   it 'announces pip --version' do
-    should include_sexp [:cmd,  'pip --version', echo: true]
+    should include_sexp [:cmd,  'pip3 --version', echo: true]
   end
 
   describe 'install' do
@@ -160,12 +160,12 @@
 
     it 'installs with pip if Requirements.txt exists' do
       branch = sexp_find(sexp, [:then])
-      expect(branch).to include_sexp [:cmd,  'pip install -r Requirements.txt', assert: true, echo: true, retry: true, timing: true]
+      expect(branch).to include_sexp [:cmd,  'pip3 install -r Requirements.txt', assert: true, echo: true, retry: true, timing: true]
     end
 
     it 'installs with pip if requirements.txt exists' do
       branch = sexp_find(sexp, [:elif, '-f requirements.txt'])
-      expect(branch).to include_sexp [:cmd,  'pip install -r requirements.txt', assert: true, echo: true, retry: true, timing: true]
+      expect(branch).to include_sexp [:cmd,  'pip3 install -r requirements.txt', assert: true, echo: true, retry: true, timing: true]
     end
 
     it 'errors if no requirements file exists' do