diff --git a/3.4/Dockerfile b/3.4/Dockerfile
index e9cdd2c62..743473130 100644
--- a/3.4/Dockerfile
+++ b/3.4/Dockerfile
@@ -31,7 +31,7 @@ RUN set -ex \
 	&& make -j$(nproc) \
 	&& make install \
 	&& ldconfig \
-	&& pip3 install --no-cache-dir --upgrade --ignore-installed pip==$PYTHON_PIP_VERSION \
+	&& pip3 install --no-cache-dir --upgrade pip==$PYTHON_PIP_VERSION \
 	&& find /usr/local -depth \
 		\( \
 		    \( -type d -a -name test -o -name tests \) \
diff --git a/3.4/alpine/Dockerfile b/3.4/alpine/Dockerfile
index 5029f4ff1..f3255ba9d 100644
--- a/3.4/alpine/Dockerfile
+++ b/3.4/alpine/Dockerfile
@@ -43,7 +43,7 @@ RUN set -ex \
 	&& ./configure --enable-shared --enable-unicode=ucs4 \
 	&& make -j$(getconf _NPROCESSORS_ONLN) \
 	&& make install \
-	&& pip3 install --no-cache-dir --upgrade --ignore-installed pip==$PYTHON_PIP_VERSION \
+	&& pip3 install --no-cache-dir --upgrade pip==$PYTHON_PIP_VERSION \
 	&& find /usr/local -depth \
 		\( \
 		    \( -type d -a -name test -o -name tests \) \
diff --git a/3.4/slim/Dockerfile b/3.4/slim/Dockerfile
index 962c1273e..f85128c57 100644
--- a/3.4/slim/Dockerfile
+++ b/3.4/slim/Dockerfile
@@ -52,7 +52,7 @@ RUN set -ex \
 	&& make -j$(nproc) \
 	&& make install \
 	&& ldconfig \
-	&& pip3 install --no-cache-dir --upgrade --ignore-installed pip==$PYTHON_PIP_VERSION \
+	&& pip3 install --no-cache-dir --upgrade pip==$PYTHON_PIP_VERSION \
 	&& find /usr/local -depth \
 		\( \
 		    \( -type d -a -name test -o -name tests \) \
diff --git a/3.4/wheezy/Dockerfile b/3.4/wheezy/Dockerfile
index 68a0bcf09..a7df3d889 100644
--- a/3.4/wheezy/Dockerfile
+++ b/3.4/wheezy/Dockerfile
@@ -31,7 +31,7 @@ RUN set -ex \
 	&& make -j$(nproc) \
 	&& make install \
 	&& ldconfig \
-	&& pip3 install --no-cache-dir --upgrade --ignore-installed pip==$PYTHON_PIP_VERSION \
+	&& pip3 install --no-cache-dir --upgrade pip==$PYTHON_PIP_VERSION \
 	&& find /usr/local -depth \
 		\( \
 		    \( -type d -a -name test -o -name tests \) \
diff --git a/3.5/Dockerfile b/3.5/Dockerfile
index 0a64e48f4..eb8b2dadf 100644
--- a/3.5/Dockerfile
+++ b/3.5/Dockerfile
@@ -31,7 +31,7 @@ RUN set -ex \
 	&& make -j$(nproc) \
 	&& make install \
 	&& ldconfig \
-	&& pip3 install --no-cache-dir --upgrade --ignore-installed pip==$PYTHON_PIP_VERSION \
+	&& pip3 install --no-cache-dir --upgrade pip==$PYTHON_PIP_VERSION \
 	&& find /usr/local -depth \
 		\( \
 		    \( -type d -a -name test -o -name tests \) \
diff --git a/3.5/alpine/Dockerfile b/3.5/alpine/Dockerfile
index b39199076..7615ea555 100644
--- a/3.5/alpine/Dockerfile
+++ b/3.5/alpine/Dockerfile
@@ -43,7 +43,7 @@ RUN set -ex \
 	&& ./configure --enable-shared --enable-unicode=ucs4 \
 	&& make -j$(getconf _NPROCESSORS_ONLN) \
 	&& make install \
-	&& pip3 install --no-cache-dir --upgrade --ignore-installed pip==$PYTHON_PIP_VERSION \
+	&& pip3 install --no-cache-dir --upgrade pip==$PYTHON_PIP_VERSION \
 	&& find /usr/local -depth \
 		\( \
 		    \( -type d -a -name test -o -name tests \) \
diff --git a/3.5/slim/Dockerfile b/3.5/slim/Dockerfile
index 0c3e35fcd..9ed13694a 100644
--- a/3.5/slim/Dockerfile
+++ b/3.5/slim/Dockerfile
@@ -52,7 +52,7 @@ RUN set -ex \
 	&& make -j$(nproc) \
 	&& make install \
 	&& ldconfig \
-	&& pip3 install --no-cache-dir --upgrade --ignore-installed pip==$PYTHON_PIP_VERSION \
+	&& pip3 install --no-cache-dir --upgrade pip==$PYTHON_PIP_VERSION \
 	&& find /usr/local -depth \
 		\( \
 		    \( -type d -a -name test -o -name tests \) \